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Vitamin D Supplements

Compare UK vitamin D supplements by D2, D3 or D3 + K2, daily dose in IU and µg, price and testing status. Find lower-dose and vegan options, then read the UK guidance below.

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22products compared

3forms compared

£0.01 – £0.35per day

2with verified testing evidence

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WeightWorld Vitamin D3 4000 IU

£0.02per day

£8.99per pack

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Best Tested

WeightWorld Vitamin D3 4000 IU

£0.02per day

£8.99per pack

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Cheapest Per Day

Nutravita Vitamin D3 1000 IU Drops

£0.01per day

£12.99per pack

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Adult UK comparison: 400 IU (10µg) is the routine supplement amount in NHS guidance. 4,000 IU (100µg) is the adult upper limit, not a target. Badges compare the recorded daily serving with these reference amounts; they are not a studied-range verdict or personal recommendation. Read the dose guide ↓

Vitamin D product comparison
#	Product	Vitamin form	Daily dose	Price/day	Testing	Score
1	WeightWorld Vitamin D3 4000 IU400 tablets	D3Tablet	4,000 IU100µgAt adult upper limit	£0.02per day£8.99 per packBuy Nowon Amazon	Testing evidence Evidence status Verified independent evidence Manufacturer statement Attached to test report no. 26C22329 ... TESTING COMPLIANCE CERTIFICATE ... Sample description: WEIGHTWORLD VITAMIN D3 40001U 400 TABLETS - BATCH CODE: 429462 ... The analyzed sample is compliant ... Vitamin D3 100 μg/tablet ... Laboratory Neotron Spa Certification body Not recorded Batch 429462 Batch-specific report Recorded Report date Not recorded Evidence checked 2026-09-14 11:22:54 Certificate of analysis ↗ Laboratory report ↗ Manufacturer testing page ↗	Why this score? Testing & evidence 22/25 Ingredient/formulation quality 15/20 Value 17/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
2	Igennus Vegan Vitamin D3 1000 IU365 tablets	D3Tablet	1,000 IU25µgAbove UK routine amount1-tablet basis	£0.05per day£19.99 per packBuy Nowon Amazon	Testing evidence Evidence status Recognised certification Manufacturer statement Nutrasource registry page states: "IGEN™ Certified" and "This product has PASSED because it does not contain detectable amounts of genetically engineered GMO proteins and genes included in the IGEN™ testing panel." Laboratory Not recorded Certification body Nutrasource IGEN™ Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:33:24 Certification record ↗ Manufacturer testing page ↗	Why this score? Testing & evidence 21/25 Ingredient/formulation quality 15/20 Value 10/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
3	Nutravita Vitamin D3 1000 IU Drops60 ml · 2,000 drops	D3Liquid	1,000 IU25µgAbove UK routine amount	£0.01per day£12.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Nutravita’s product page says "Laboratory tested products"; the Ingredients page says ingredients go through "strict testing" and that "the testing is done in-house at the manufacturing site." I did not find any independently verifiable third-party lab report or certification for this specific product, and the only registry result I found was NSF listings for other brands/products, not Nutravita Vitamin D3 Drops. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:27:53 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 20/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
4	Nutravita Vitamin D3 4000 IU Softgels400 softgels	D3Softgel	4,000 IU100µgAt adult upper limit	£0.02per day£7.64 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Nutravita’s Ingredients page says: “any ingredient selected goes through strict testing to make sure it complies with EU standards” and “The testing is done in-house at the manufacturing site…”; the product page also says “Laboratory tested products.” Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:16:53 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 18/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
5	WeightWorld Vitamin D3 2000 IU + K2365 tablets	D3 + K2TabletMK-7 · 200µg/day	2,000 IU50µgAbove UK routine amount	£0.03per day£9.49 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer page says: "Third-party lab tested — View Certificate" and "All our products undergo thorough research and testing before they hit the market." Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:21:45 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 16/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
6	Nutrition Geeks Vitamin D 1000 IU365 tablets	D3Tablet	1,000 IU25µgAbove UK routine amount	£0.02per day£5.94 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site has a general claim of an "Update on Third Party Testing" and says "we have the evidence to prove it" plus "an independent third-party lab retested the exact same batch" — but this is on a different product (Ashwagandha/Milk Thistle), not this Vitamin D 1000iu product, and I did not find an independently verifiable testing/certification page for the Vitamin D product itself. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:41:41 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 19/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
7	Nu U Nutrition Vitamin D3 1000 IU365 softgels	D3Softgel	1,000 IU25µgAbove UK routine amount	£0.03per day£9.97 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site says: "We work tirelessly to identify and test the supplements that really work" and "we ensure every product is created using the highest quality ingredients..." but I found no independently verifiable COA, lab report, or third-party certification for this specific Vitamin D3 1000 IU product. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:42:37 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 15/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
8	Together Health Vitamin D3 1000 IU30 capsules	D3Capsule	1,000 IU25µgAbove UK routine amount	£0.22per day£6.48 per packBuy Nowon Amazon	Testing evidence Evidence status Manufacturer COA Manufacturer statement Certificate of Analysis for Vitamin D3, Product Code TH-VD3-30, Batch Number 56635: 'Vitamin D3 25μg/1000iu Conforms' and 'Analysis performed by a 3rd party lab, accredited by UKAS' Laboratory Not recorded Certification body Not recorded Batch 56635 Batch-specific report Recorded Report date Not recorded Evidence checked 2026-09-14 11:34:50 Certificate of analysis ↗ Laboratory report ↗ Manufacturer testing page ↗	Why this score? Testing & evidence 13/25 Ingredient/formulation quality 15/20 Value 2/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
9	Healthspan Vitamin D3 400 IU240 tablets	D3Tablet	400 IU10µgUK routine amount	£0.05per day£12.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Batch certificate states: "The following production batch has been tested by the laboratories of LGC and meets the requirements and standards of Informed Sport." Product: "Healthspan Elite 4,000iu Vitamin D3"; batch 140254. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:36:08	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 11/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
10	Vitabiotics Ultra Vitamin D 400 IU96 tablets	D3Tablet	400 IU10µgUK routine amount	£0.03per day£3.16 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 16:47:34	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 14/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
11	Veganicity Vegan Vitamin D3 400 IU90 tablets	D3Tablet	400 IU10µgUK routine amount1-tablet basis	£0.06per day£5.75 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Veganicity’s Ethical page says: “100% Vegan Society Registered” and “every Veganicity product has been registered with the Society before being made available for purchase.” This is a registration/ethical claim, not an independently verified purity/potency testing claim for this product. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:32:42 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 10/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
12	Vitabiotics Ultra Vitamin D 1000 IU96 tablets	D3Tablet	1,000 IU25µgAbove UK routine amount	£0.04per day£4.08 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:37:21	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 13/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
13	Simply Supplements Vitamin D2 2000 IU360 tablets	D2Tablet	2,000 IU50µgAbove UK routine amount1-tablet basis	£0.04per day£15.99 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:31:13	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 12/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
14	Natures Aid Vitamin D3 400 IU90 tablets	D3Tablet	400 IU10µgUK routine amount	£0.07per day£5.99 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 16:48:41	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 9/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
15	Viridian Vitamin D3 1000 IU + K290 capsules	D3 + K2CapsuleMK-7 · 45µg/day	1,000 IU25µgAbove UK routine amount1-capsule basis	£0.35per day£31.85 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer product page states: "Vegan, clinically trialled vitamin D3" and "non-animal tested vitamin K2"; homepage also says "130 Purity Checks" and "Independently BRC certified to the highest AA grade" / "verified by the Soil Association" for some products, but I did not find an independently verifiable certification or COA for this specific product. Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:19:03 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 0/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
16	Vitabiotics Ultra Vitamin D 2000 IU96 tablets	D3Tablet	2,000 IU50µgAbove UK routine amount	£0.07per day£6.45 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:23:13	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 7/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
17	Solgar Vitamin D3 2200 IU100 capsules	D3Capsule	2,200 IU55µgAbove UK routine amount	£0.21per day£21.15 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:22:25	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 3/20 Dose transparency 14/15 Manufacturer transparency 6/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
18	Veganicity Vitamin D2 800 IU90 tablets	D2Tablet	800 IU20µgAbove UK routine amount	£0.08per day£7.25 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Manufacturer site says: "Every Veganicity product proudly bears the insignia of the world-renowned Vegan Society, because every Veganicity product has been registered with the Society before being made available for purchase." Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:43:58 Manufacturer testing page ↗	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 6/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
19	Club Vits Vitamin D3 1000 IU Gummies120 gummies	D3Gummy	1,000 IU25µgAbove UK routine amount	£0.08per day£9.99 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:29:35	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 5/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
20	BetterYou Vitamin D3 3000 IU + K2 Spray12 ml · 30 daily servings	D3 + K2SprayMK-7 · 75µg/day	3,000 IU75µgAbove UK routine amount	£0.25per day£7.59 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer page says: "Absorption Tested by Cardiff University" and "Clinically proven absorption - The nutrients are quickly absorbed through the buccal membrane..." Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:25:19 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 1/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
21	SunVit-D3 Vegan Vitamin D3 1000 IU60 tablets	D3Tablet	1,000 IU25µgAbove UK routine amount	£0.15per day£8.99 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Vegetarian Society registry page lists this product under ACCREDITED PRODUCTS as “SUNVIT-D3 VITAMIN D3 VEGAN 1000IU TABLETS (VEGAN)” / “SUNVIT-D3 VITAMIN D3 1000IU TABLETS.” Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:34:05	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 4/20 Dose transparency 14/15 Manufacturer transparency 3/10 Label/ingredient transparency 9/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
22	Oxford Vitality Vitamin D3 1000 IU + K2120 tablets	D3 + K2TabletMK-7 · 100µg/day	1,000 IU25µgAbove UK routine amount	£0.07per day£7.99 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Not recorded Laboratory Not recorded Certification body Not recorded Batch Not recorded Batch-specific report Not established in this record Report date Not recorded Evidence checked 2026-09-14 11:20:40	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 9/20 Dose transparency 9/15 Manufacturer transparency 6/10 Label/ingredient transparency 4/10 Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.

Vitamin form: D3Tablet
Daily dose: 4,000 IU100µgAt adult upper limit

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 400 tablets

Full ingredients and formulation →

£0.02per day£8.99 per pack

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Vitamin form: D3Tablet
Daily dose: 1,000 IU25µgAbove UK routine amount1-tablet basis

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 365 tablets

Full ingredients and formulation →

£0.05per day£19.99 per pack

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Vitamin form: D3Liquid
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Liquid
Serving: 1 drop
Servings/day: 1
Pack size: 60 ml · 2,000 drops

Full ingredients and formulation →

£0.01per day£12.99 per pack

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Vitamin form: D3Softgel
Daily dose: 4,000 IU100µgAt adult upper limit

Formulation & serving details

Format: Softgel
Serving: 1 softgel
Servings/day: 1
Pack size: 400 softgels

Full ingredients and formulation →

£0.02per day£7.64 per pack

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Vitamin form: D3 + K2TabletMK-7 · 200µg/day
Daily dose: 2,000 IU50µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 365 tablets

Full ingredients and formulation →

£0.03per day£9.49 per pack

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Vitamin form: D3Tablet
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 365 tablets

Full ingredients and formulation →

£0.02per day£5.94 per pack

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Vitamin form: D3Softgel
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Softgel
Serving: 1 softgel
Servings/day: 1
Pack size: 365 softgels

Full ingredients and formulation →

£0.03per day£9.97 per pack

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Vitamin form: D3Capsule
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Capsule
Serving: 1 capsule
Servings/day: 1
Pack size: 30 capsules

Full ingredients and formulation →

£0.22per day£6.48 per pack

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Vitamin form: D3Tablet
Daily dose: 400 IU10µgUK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 240 tablets

Full ingredients and formulation →

£0.05per day£12.99 per pack

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Vitamin form: D3Tablet
Daily dose: 400 IU10µgUK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 96 tablets

Full ingredients and formulation →

£0.03per day£3.16 per pack

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Vitamin form: D3Tablet
Daily dose: 400 IU10µgUK routine amount1-tablet basis

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 90 tablets

Full ingredients and formulation →

£0.06per day£5.75 per pack

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Vitamin form: D3Tablet
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 96 tablets

Full ingredients and formulation →

£0.04per day£4.08 per pack

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Vitamin form: D2Tablet
Daily dose: 2,000 IU50µgAbove UK routine amount1-tablet basis

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 360 tablets

Full ingredients and formulation →

£0.04per day£15.99 per pack

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Vitamin form: D3Tablet
Daily dose: 400 IU10µgUK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 90 tablets

Full ingredients and formulation →

£0.07per day£5.99 per pack

View Analysis Buy Now on Amazon

Vitamin form: D3 + K2CapsuleMK-7 · 45µg/day
Daily dose: 1,000 IU25µgAbove UK routine amount1-capsule basis

Formulation & serving details

Format: Capsule
Serving: 1 capsule
Servings/day: 1
Pack size: 90 capsules

Full ingredients and formulation →

£0.35per day£31.85 per pack

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Vitamin form: D3Tablet
Daily dose: 2,000 IU50µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 96 tablets

Full ingredients and formulation →

£0.07per day£6.45 per pack

View Analysis Buy Now on Amazon

Vitamin form: D3Capsule
Daily dose: 2,200 IU55µgAbove UK routine amount

Formulation & serving details

Format: Capsule
Serving: 1 capsule
Servings/day: 1
Pack size: 100 capsules

Full ingredients and formulation →

£0.21per day£21.15 per pack

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Vitamin form: D2Tablet
Daily dose: 800 IU20µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 90 tablets

Full ingredients and formulation →

£0.08per day£7.25 per pack

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Vitamin form: D3Gummy
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Gummy
Serving: 1 gummy
Servings/day: 1
Pack size: 120 gummies

Full ingredients and formulation →

£0.08per day£9.99 per pack

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Vitamin form: D3 + K2SprayMK-7 · 75µg/day
Daily dose: 3,000 IU75µgAbove UK routine amount

Formulation & serving details

Format: Spray
Serving: 3 sprays
Servings/day: 1
Pack size: 12 ml · 30 daily servings

Full ingredients and formulation →

£0.25per day£7.59 per pack

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Vitamin form: D3Tablet
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 60 tablets

Full ingredients and formulation →

£0.15per day£8.99 per pack

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Vitamin form: D3 + K2TabletMK-7 · 100µg/day
Daily dose: 1,000 IU25µgAbove UK routine amount

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 120 tablets

Full ingredients and formulation →

£0.07per day£7.99 per pack

View Analysis Buy Now on Amazon

One-time purchase prices; delivery and conditional discounts excluded. Daily cost uses the recorded label serving. Comparison amounts are not personal dose recommendations. Unknown Prime eligibility is not treated as confirmed.

Vitamin D forms & labels explained

D2 and D3 identify the vitamin; a capsule, tablet or spray identifies its delivery format. K2 is another nutrient. The cards below explain these distinctions; the dose and evidence sections link to the supporting sources.

D3

Cholecalciferol

Identity: The form also made in skin
Source: Animal-derived or vegan, depending on the formulation

Widely used in supplements. D3 generally raises blood 25(OH)D more than D2 and maintains it longer; this does not establish that every D3 product improves clinical outcomes more.

D2

Ergocalciferol

Identity: A different form of vitamin D
Source: Commonly manufactured from irradiated yeast

D2 can raise vitamin D status too. It is not inactive or useless. Dose, frequency and the starting blood level matter when interpreting D2-versus-D3 studies.

D3 + K2

Two nutrients in one product

K2 forms: MK-7 and MK-4 are menaquinones
Our table: Shows the disclosed K2 form and daily amount

Vitamin K supports clotting and bone-related proteins. That biological role does not prove everyone taking D3 needs K2, or that K2 prevents vitamin D toxicity. Check vitamin K antagonist medicines such as warfarin.

Vegan D3

Source and capsule both matter

Common source: Lichen; some products disclose algae
Check: The full formulation and dietary claim

Lanolin comes from sheep’s wool. A vegetarian capsule is not automatically vegan D3. The vegan filter uses an explicit product claim; unspecified sources remain unknown. Read the current label.

Units explained

IU and micrograms

Conversion: 1µg = 40 IU; divide IU by 40
Example: 2,000 IU = 50µg

µg and mcg both mean micrograms. Both units are shown together. The daily total accounts for the recorded serving frequency; we do not ask you to convert it.

Carrier oil

Absorption and ingredients

Examples: Sunflower, coconut or MCT oil when disclosed
Remember: Flavouring oil and emulsifiers are different

Dietary fat can improve absorption, although some vitamin D is absorbed without fat. An oil ingredient alone cannot establish that one finished product works better. Tablets can be taken with a meal.

Vitamin D dosage: UK guidance and higher-dose products

This comparison is for adults. Official intake guidance, supplement labels and research protocols answer different questions. We use UK reference amounts for the badges, rather than inventing a universal “commonly studied range”.

Four numbers that should not be confused
Reference	Amount	What it means
UK RNI	400 IU / 10µg per day	SACN’s reference nutrient intake from food, fortified food and supplements combined, for ages four and over. It was developed without assuming sunlight exposure. SACN report.
Routine supplement advice	400 IU / 10µg per day	The NHS advises considering this supplement amount in autumn and winter; higher-risk groups may need it throughout the year. NHS guidance.
Label NRV	200 IU / 5µg	The labelling reference behind percentages such as 500% NRV for 25µg. It is not the UK RNI or an upper limit. NRV table, Annex XIII.
Adult upper limit	4,000 IU / 100µg per day	A ceiling, not a recommended target. Count vitamin D across products and dietary intake; individual medical circumstances can change what is appropriate. NHS safety advice.

How to read the dose badges
Green marks the routine UK amount. Blue means above that amount but below the adult upper limit. Amber flags amounts below routine guidance or at/above the upper limit. Colour describes a comparison, not personal suitability. A product at the upper limit leaves no allowance for other sources.

Sold doses are not study recommendations. This set includes 400, 800, 1,000, 2,000, 2,200, 3,000 and 4,000 IU daily servings. In VITAL, 2,000 IU/day did not reduce fractures in generally healthy older adults who were not selected for deficiency. Read the trial. That dose is a study example, not a universal target.

Treatment is a separate context. Clinicians may prescribe a short loading course for deficiency, followed by maintenance treatment. Retail dose badges do not assess these regimens. Follow the prescribed frequency, not an averaged daily number. NHS treatment guidance.

Where a label permits a serving range, the table uses the lowest confirmed adult serving and marks its basis. The product record shows the full directions and the effect of a larger serving on dose and cost.

Vitamin D benefits: what a comparison score can tell you

Vitamin D is involved in calcium and phosphate regulation and normal bone and muscle function. Preventing deficiency is a different question from whether extra vitamin D benefits someone whose status is already adequate. SACN reviewed the musculoskeletal evidence.

Our provisional scores compare label information and daily cost. They do not measure medical benefit, absorption in an individual, or verified potency. A D3 + K2 product receives no automatic bonus for adding K2.

Vitamin D evidence by goal

Evidence by goal
Goal	Evidence strength	What was assessed	Typical study context	Main limitation
Avoiding deficiency-related bone disease	Established nutritional role	D2 and D3	Adequate intake and treatment where indicated	Does not establish a need for a high-dose retail product
Fracture prevention in generally healthy older adults	No benefit in the VITAL ancillary trial	D3	2,000 IU/day; 25,871 participants	Not recruited for deficiency, low bone mass or osteoporosis
Immune function	Normal biological role	Vitamin D	Nutrient adequacy	Does not prove a high-dose product prevents infection
Added K2 for everyone taking D3	Universal requirement not established	D3 with MK-7 or MK-4	Different formulations and outcomes	Mechanisms and blood markers are not proof of fewer clinical events

Read the full evidence-by-goal detail

Bone health and deficiency

The UK evidence review supports adequate vitamin D for musculoskeletal health. A comparison website cannot determine whether bone pain or weakness reflects a deficiency.

Fractures

The VITAL fracture trial found no significant reduction in total, non-vertebral or hip fractures with 2,000 IU/day. It does not rule out the value of treating confirmed deficiency, because participants were not selected for that condition.

Immunity and combinations

NIH ODS describes immune functions but does not establish that more vitamin D means better protection from illness. NIH’s vitamin K review describes mixed clinical evidence for bone outcomes and insufficient certainty for routine cardiovascular prevention claims. Do not read “supports immunity” or “directs calcium” as proof of a clinical benefit from this product.

When to take vitamin D: food, timing and routine

With a meal

NHS instructions for colecalciferol tablets and capsules recommend taking them with the main meal. Oil-based products are not automatically superior. How to take colecalciferol.

Choose a workable routine

These sources do not establish one best clock time. Follow the specific format’s instructions: a spray dose may require several sprays, while a dropper’s concentration can vary by product.

A daily label dose and a prescribed weekly dose must not be interchanged. Do not double a missed prescribed dose; follow the medicine leaflet or ask a pharmacist. NHS missed-dose guidance.

Vitamin D side effects and excessive intake

Who should be cautious?If any of the following apply to you, speak to a healthcare professional before taking Vitamin D - see the full detail below for why.

High blood or urine calcium, or already high vitamin D
Kidney disease, previous kidney stones or sarcoidosis
Relevant prescribed medicines, including warfarin for K2 combinations
Pregnancy, breastfeeding or use for a child: check the specific product and age-appropriate advice

Excess vitamin D can cause hypercalcaemia (too much calcium in the blood), with potential harm to the kidneys and heart. High-strength supplements are not a substitute for checking whether a larger dose is needed. NHS guidance on excessive intake.

Discuss kidney problems, stones, high calcium, sarcoidosis or an allergy to an ingredient before supplementation. Some formulations contain soya or animal gelatine; check the current pack. Who may need extra caution.

After an excessive dose, symptoms such as marked thirst, frequent urination, nausea or weakness need medical advice. Follow NHS advice on taking too much colecalciferol. Children have different limits; this adult comparison should not be used to choose their dose.

Vitamin D interactions and D3 + K2

Vitamin D and medicines

Digoxin and some thiazide-type diuretics need particular caution because of calcium-related effects. Some seizure medicines, steroids and absorption-altering medicines can also matter. Have a pharmacist check your list. NHS interaction guidance.

D3 + K2 and anticoagulants

Vitamin K can interfere with vitamin K antagonists such as warfarin. Do not add a K2 supplement or change vitamin K intake without guidance from the clinician managing your treatment. NIH vitamin K interactions.

Check existing multivitamins, calcium-plus-D products and cod liver oil before adding another source. Check overlapping ingredients and costs across your products; K2 should not be treated as protection against excessive vitamin D.

Vitamin D in winter, food and higher-risk groups

Autumn and winter

UK advice reflects reduced skin synthesis during the darker months. Summer exposure varies with lifestyle, clothing and other factors; there is no single safe number of sunlight minutes for everyone. UK seasonal context.

Higher risk of low intake or exposure

People who are housebound, usually cover their skin or have darker skin should consider year-round supplementation under UK guidance. Malabsorption or other medical circumstances may require an individual plan. UK guidance and medical cautions.

Food sources

Oily fish, eggs and fortified foods can contribute. For plant-based diets, check fortified food labels and the source of supplemental D3. NHS food sources and Vegan Society guidance.

Men, women and pregnancy

The UK RNI includes adults, pregnant and breastfeeding women. “For men” or “for women” is not itself a reason for a stronger supplement. Check individual product exclusions and discuss treatment needs separately. SACN intake recommendations.

Testing, labels and how we compare

Testing review pending means detailed product testing research has not yet been completed. Check each product’s current status. A seller’s “third-party tested” statement, a branded ingredient or a retailer award is not a verified batch report.

Useful evidence records include identity and potency results, laboratory details, batch numbers, report dates and contaminant panels relevant to the formulation. Read how we verify testing.

Value uses daily cost rather than price per IU. Dose transparency rewards a clear label, not a larger dose. Ingredients and source claims are recorded separately from testing. Manufacturer transparency here is a limited listing review; scores are provisional while testing is pending. View an individual analysis for research notes and dated source links.

Vitamin D blood tests: understanding 25(OH)D

The usual status test measures total 25-hydroxyvitamin D, or 25(OH)D, rather than the IU in a capsule. UK reports commonly use nmol/L; 1 ng/mL equals 2.5 nmol/L. The active hormone, 1,25-dihydroxyvitamin D, is a different test. NIH test context.

Example UK interpretation — use the range supplied by your own laboratory
25(OH)D result	General context
Below 25 nmol/L	Deficiency range in the cited NHS laboratory guidance.
25–50 nmol/L	May be inadequate for some people; treatment depends on clinical context.
Above 50 nmol/L	Sufficient for almost all people in that guidance; higher is not automatically better.

Gloucestershire Hospitals NHS guidance supplies these bands and advises against routine screening in people without symptoms. Testing may help when symptoms, risk factors or treatment decisions justify it. It is not a prerequisite for every routine supplement purchase.

A result is context, not a diagnosis here.
Interpret it alongside symptoms, season, existing supplements, kidney health and the laboratory method. Reference ranges and clinical decision thresholds are not identical. A result near a boundary is not a reason to adjust a dose yourself; ask the clinician who requested it.

People differ in starting status, exposure and absorption. A test cannot identify the best retail brand or verify a bottle’s contents. Use a clinician-led plan when deficiency treatment or follow-up monitoring is needed.

Testing evidence in this comparison

A testing claim is not the same as a verified report. No public evidence located does not mean a product has not been tested.

Testing review pending0

Recognised certification1

Verified independent evidence1

Manufacturer COA1

Testing claimed9

No public evidence located10

What does vitamin d cost?

Current UK comparison set, based on the daily serving shown on each label.

£0.01Lowest daily cost

£0.06Median daily cost

£0.35Highest daily cost

Your questions, answered

How much vitamin D should I take in the UK?

Start with the UK dose guide, which separates routine supplement advice, total intake, label NRV and the adult upper limit. Treatment for confirmed deficiency follows a separate clinical plan.

Is vitamin D the same as D3?

Vitamin D is the family name; D3 is cholecalciferol and D2 is ergocalciferol. Both can raise vitamin D status. Read the D3 and D2 cards.

Do I need K2 with vitamin D3?

There is no established universal requirement to add K2. A combination adds another nutrient and a medication consideration; see D3 + K2 explained and the interaction section.

How many micrograms is 2,000 IU?

2,000 IU is 50µg. Divide IU by 40 to get micrograms; the table already shows both. See the unit guide.

Is 4,000 IU vitamin D a normal daily target?

The adult upper limit is not a target. Read the dose guidance before choosing a high-strength product, particularly if other supplements also contain vitamin D.

When should I take vitamin D, and should it be with food?

Follow the format’s label or your prescription. The timing section explains meal guidance and why this page does not prescribe one best clock time.

What are the symptoms of vitamin D deficiency?

Symptoms alone cannot confirm deficiency. Persistent bone pain, weakness or other concerns deserve assessment; the blood-test section explains the measurement and its limitations.

Can vegans take vitamin D3?

Yes, explicitly vegan D3 products are available. Check the source and the whole formulation, including the capsule shell. Use the Vegan filter and read vegan D3 explained.

Should I buy a vitamin D blood test?

A test is most useful when its result could change care. Routine screening is not generally recommended for people without symptoms. Read when testing may help before purchasing.

Why do some records use one tablet when the label allows two?

We use the lowest confirmed adult serving for a consistent dose and daily-price basis. Those rows are marked. The full record preserves the range; a larger serving changes both nutrient amounts and cost.

Sources & methodology

Read our methodology and how we verify testing.

Page updated11 Sep 2026

Editorial reviewSources checked 11 September 2026; clinical editorial approval pending

Product evidenceSee individual records

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Vitamin D forms & labels explained

D3

D2

D3 + K2

Vegan D3

Units explained

Carrier oil

Vitamin D dosage: UK guidance and higher-dose products

Vitamin D benefits: what a comparison score can tell you

Vitamin D evidence by goal

Bone health and deficiency

Fractures

Immunity and combinations

When to take vitamin D: food, timing and routine

With a meal

Choose a workable routine

Vitamin D side effects and excessive intake

Vitamin D interactions and D3 + K2

Vitamin D and medicines

D3 + K2 and anticoagulants

Vitamin D in winter, food and higher-risk groups

Autumn and winter

Higher risk of low intake or exposure

Food sources

Men, women and pregnancy

Testing, labels and how we compare

Vitamin D blood tests: understanding 25(OH)D

Testing evidence in this comparison

What does vitamin d cost?

Your questions, answered

Sources & methodology