Compare elemental magnesium, not compound weight. A 1,420 mg bisglycinate compound can supply 200 mg elemental magnesium. The rest is the accompanying compound. Use the declared elemental amount; do not infer it from a generic conversion percentage. Read the dose guide ↓

Magnesium product comparison
#	Product	Active form	Daily dose	Price/day	Testing	Score
1	WeightWorld Magnesium Glycinate + B6180 capsules	Bisglycinate	200 mgelemental magnesiumWithin commonly studied range	£0.11per day£9.95 per packBuy Nowon Amazon	Testing evidence Evidence status Verified independent evidence Manufacturer statement WeightWorld UK product page says “Third-party lab tested — View Certificate”; the certificate for WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825 is a Testing Compliance Certificate attached to test report no. 26C22334 from Neotron Spa, and it states the sample is compliant with contaminant limits and nutrient tolerances. Laboratory Neotron Spa Certification body Not recorded Batch 0429825 Batch-specific report Recorded Report date Not recorded Evidence checked 2026-09-14 17:23:35 Certificate of analysis ↗ Laboratory report ↗ Manufacturer testing page ↗	Why this score? Testing & evidence 21/25 Ingredient/formulation quality 15/20 Value 8/20 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	WeightWorld Magnesium 4-in-1180 capsules	Bisglycinate Citrate Malate Taurate	400 mgelemental magnesiumWithin commonly studied range	£0.15per day£13.49 per packBuy Nowon Amazon	Testing evidence Evidence status Manufacturer COA Manufacturer statement WeightWorld product page says the supplement is "Third-Party Tested" and the page includes a PDF titled "WEIGHTWORLD_MAGNESIUM_GLYCINATE_1422_mg_180_CAPSULES_-_BATCH_CODE_0429825-TCC.pdf". The PDF itself is a "TESTING COMPLIANCE CERTIFICATE" for "WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825" and reports microbiology and contaminant testing plus magnesium/vitamin B6 tolerance checks. Laboratory Not recorded Certification body Not recorded Batch 0429825 Batch-specific report Recorded Report date Not recorded Evidence checked 2026-09-14 17:44:37 Certificate of analysis ↗ Laboratory report ↗ Manufacturer testing page ↗	Why this score? Testing & evidence 14/25 Ingredient/formulation quality 13/20 Value 17/20 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.
3	Lindens Magnesium 500 mg Oxide90 tablets	Oxide	300 mgelemental magnesiumWithin commonly studied range	£0.07per day£6.59 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 17:47:36	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 19/20 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	Zipvit Magnesium 500 mg90 tablets	Oxide	500 mgelemental magnesiumAbove commonly studied range	£0.09per day£7.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Amazon listing image/text says: “Third Party Tested”, “Independently Verified for Quality & Safety”, “Tested for Heavy Metals & Contaminants”, and “Strength & Purity.” Zipvit’s own product page also says “102% LABEL ACCURACY”, “4/4 TESTS PASSED”, “2/2 CLAIMS VERIFIED”, “INDEPENDENTLY LAB TESTED”, and “SEE LAB RESULTS.” 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 17:22:57 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 20/20 Dose transparency 12/15 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.
5	VitaBright Magnesium Citrate240 capsules	Oxide Citratebuffered	444 mgelemental magnesiumAbove commonly studied range	£0.13per day£15.87 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement VitaBright says: "All our supplements undergo rigorous quality testing. We normally have every batch tested by an independent laboratory which issues third-party certification." 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 17:32:08 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 18/20 Dose transparency 12/15 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.
6	Nu U Nutrition Magnesium Citrate 200 mg180 tablets	Citratebuffered	200 mgelemental magnesiumWithin commonly studied range	£0.08per day£14.97 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 17:31:19	Why this score? Testing & evidence 0/25 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.
7	Healthspan Magnesium + B Vitamins90 tablets	Hydroxide Oxide	375 mgelemental magnesiumWithin commonly studied range	£0.16per day£13.99 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 17:37:31	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 16/20 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.
8	Vitabiotics Ultra Magnesium60 tablets	Hydroxide Oxide	375 mgelemental magnesiumWithin commonly studied range	£0.16per day£4.76 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 17:22:14	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 14/20 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.
9	Nature’s Bounty Magnesium 250 mg100 tablets	Oxide	250 mgelemental magnesiumWithin commonly studied range	£0.12per day£11.99 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 17:29:49	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 13/20 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.
10	SS Sport Supplies Magnesium Glycinate + B6120 capsules	Bisglycinate	315 mgelemental magnesiumWithin commonly studied range	£0.17per day£9.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site says: "Certified for Quality & Safety — Our products are GMP (Good Manufacturing Practice) certified" and the product page also shows two COA images, but I did not find an independently verifiable third-party registry entry or readable lab report 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 17:45:49 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 10/20 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.
11	New Leaf Magnesium 4-in-1120 capsules	Bisglycinate Oxide Citrate Malate	381 mgelemental magnesiumWithin commonly studied range	£0.20per day£11.95 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site says: "Formulated and Tested with Expertise" and "our products undergo rigorous testing for heavy metals and unwanted compounds during production" on the Ingredients & Quality page. 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 17:20:38 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 13/20 Value 11/20 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.
12	Nutrition Geeks Magnesium 3-in-190 capsules	Bisglycinate Citrate Malate	384 mgelemental magnesiumWithin commonly studied range	£0.22per day£9.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer product page states: "Third-party tested" and "JUN 2026 1 active ingredient tested for quality" for Magnesium Glycinate 3-in-1. 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 17:21:32 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 13/20 Value 7/20 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	AAVALABS Fullnesium Complex180 capsules	Bisglycinate Oxide Citrate Malate Taurate	425 mgelemental magnesiumAbove commonly studied range	£0.22per day£19.60 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement AAVALABS’ own FAQ and brand article say the company’s products are subjected to “thorough independent third-party laboratories to ensure purity, including checks for heavy metals, GMOs, and gluten,” but I did not find a product-specific COA, lab report, or certifying-body registry entry for Fullnesium Complex. 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 17:43:55 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 13/20 Value 12/20 Dose transparency 12/15 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	Zipvit Magnesium Glycinate + B6120 tablets	Bisglycinate	400 mgelemental magnesiumWithin commonly studied range	£0.17per day£9.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Amazon listing and Zipvit product page both claim the product is "Third Party Tested" / "Independently Verified for Quality & Safety" and "INDEPENDENTLY LAB TESTED"; Zipvit product page also shows "106% LABEL ACCURACY 4/4 TESTS PASSED 1/1 CLAIMS VERIFIED". 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 17:51:04 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 15/20 Dose transparency 9/15 Manufacturer transparency 3/10 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.
15	Solgar Magnesium Citrate120 tablets	Citrate	400 mgelemental magnesiumWithin commonly studied range	£0.22per day£12.99 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 17:28:22	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 9/20 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.
16	New Leaf Magnesium Glycinate120 capsules	Bisglycinate	208 mgelemental magnesiumWithin commonly studied range	£0.15per day£8.97 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site says: "To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production..." 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 17:24:53 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 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.
17	Inner Vitality Magnesium Glycinate180 capsules	Bisglycinate	280 mgelemental magnesiumWithin commonly studied range	£0.20per day£17.97 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 17:27:04	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.
18	Time Health Magtein L-Threonate120 capsules	L-ThreonateMagtein claimed	151 mgelemental magnesiumBelow commonly studied range	£0.88per day£26.49 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Time Health product page says "Third Party Test Report" and "Heavy Metal Analysis" for Magnesium L-Threonate - Magtein® - Cognitive & Sleep Support, but I did not locate an independently verifiable lab report or certification page 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 17:38:29 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 2/20 Dose transparency 9/15 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.
19	Viridian High Potency Magnesium30 capsules	Bisglycinate Oxide Citrate	300 mgelemental magnesiumWithin commonly studied range	£0.39per day£11.55 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Viridian’s own site says the product has "130 purity checks" and the product page says "I Trust Viridian Supplements because I see what goes into them - 130 purity checks, no junk, and formulas rooted in real research"; the brand also says "Our 130 Point Promise" includes a "Purity" checklist and that a reference sample of every batch is kept for its complete shelf life. 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 17:34:26 Manufacturer testing page ↗	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 13/20 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.
20	Double Wood Magtein L-Threonate120 capsules	L-ThreonateMagtein claimed	144 mgelemental magnesiumBelow commonly studied range	£1.30per day£38.99 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement Manufacturer site says: “We publicize our third party test results so you can be confident that you’re stacking with the best.” Amazon listing also says: “THIRD PARTY TESTED – Our capsules are third party tested for purity and potency.” 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 17:41:49 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 0/20 Dose transparency 9/15 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.
21	Wild Nutrition Food-Grown Magnesium60 capsules	Food-grown complex	80 mgelemental magnesiumBelow commonly studied range	£0.68per day£20.50 per packBuy Nowon Amazon	Testing evidence Evidence status No public evidence located Manufacturer statement Wild Nutrition’s own site says Food-Grown® Magnesium is “Scientifically studied” and that a “gold-standard placebo-controlled sleep study” showed it “increases sleep by 42 minutes per night and sleep quality by 32%”; it also says the product was put through a “double-blind, parallel clinical trial” with the University of Queensland. 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 17:36:31 Manufacturer testing page ↗	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 13/20 Value 1/20 Dose transparency 9/15 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	New Leaf Magnesium Malate120 capsules	Malate	180 mgelemental magnesiumBelow commonly studied range	£0.22per day£12.93 per packBuy Nowon Amazon	Testing evidence Evidence status Testing claimed Manufacturer statement New Leaf Products’ Ingredients & Quality page says: “To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production …” 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 17:49:44 Manufacturer testing page ↗	Why this score? Testing & evidence 3/25 Ingredient/formulation quality 15/20 Value 5/20 Dose transparency 4/15 Manufacturer transparency 3/10 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.
23	Pure Encapsulations Magnesium Citrate90 capsules	Citrate	150 mgelemental magnesiumBelow commonly studied range	£0.25per day£22.35 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 17:52:29	Why this score? Testing & evidence 0/25 Ingredient/formulation quality 15/20 Value 3/20 Dose transparency 4/15 Manufacturer transparency 3/10 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.

Active form: Bisglycinate
Daily dose: 200 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 180 capsules

Full ingredients and formulation →

£0.11per day£9.95 per pack

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Active form: Bisglycinate Citrate Malate Taurate
Daily dose: 400 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 180 capsules

Full ingredients and formulation →

£0.15per day£13.49 per pack

View Analysis Buy Now on Amazon

Active form: Oxide
Daily dose: 300 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

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

Full ingredients and formulation →

£0.07per day£6.59 per pack

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Active form: Oxide
Daily dose: 500 mgelemental magnesiumAbove commonly studied range

Formulation & serving details

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

Full ingredients and formulation →

£0.09per day£7.99 per pack

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Active form: Oxide Citratebuffered
Daily dose: 444 mgelemental magnesiumAbove commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 240 capsules

Full ingredients and formulation →

£0.13per day£15.87 per pack

View Analysis Buy Now on Amazon

Active form: Citratebuffered
Daily dose: 200 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 180 tablets

Full ingredients and formulation →

£0.08per day£14.97 per pack

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Active form: Hydroxide Oxide
Daily dose: 375 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

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

Full ingredients and formulation →

£0.16per day£13.99 per pack

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Active form: Hydroxide Oxide
Daily dose: 375 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Tablet
Serving: 2 tablets
Servings/day: 1
Pack size: 60 tablets

Full ingredients and formulation →

£0.16per day£4.76 per pack

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Active form: Oxide
Daily dose: 250 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Tablet
Serving: 1 tablet
Servings/day: 1
Pack size: 100 tablets

Full ingredients and formulation →

£0.12per day£11.99 per pack

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Active form: Bisglycinate
Daily dose: 315 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£0.17per day£9.99 per pack

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Active form: Bisglycinate Oxide Citrate Malate
Daily dose: 381 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£0.20per day£11.95 per pack

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Active form: Bisglycinate Citrate Malate
Daily dose: 384 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 90 capsules

Full ingredients and formulation →

£0.22per day£9.99 per pack

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Active form: Bisglycinate Oxide Citrate Malate Taurate
Daily dose: 425 mgelemental magnesiumAbove commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 180 capsules

Full ingredients and formulation →

£0.22per day£19.60 per pack

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Active form: Bisglycinate
Daily dose: 400 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Tablet
Serving: 2 tablets
Servings/day: 1
Pack size: 120 tablets

Full ingredients and formulation →

£0.17per day£9.99 per pack

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Active form: Citrate
Daily dose: 400 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Tablet
Serving: 2 tablets
Servings/day: 1
Pack size: 120 tablets

Full ingredients and formulation →

£0.22per day£12.99 per pack

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Active form: Bisglycinate
Daily dose: 208 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£0.15per day£8.97 per pack

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Active form: Bisglycinate
Daily dose: 280 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 180 capsules

Full ingredients and formulation →

£0.20per day£17.97 per pack

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Active form: L-ThreonateMagtein claimed
Daily dose: 151 mgelemental magnesiumBelow commonly studied range

Formulation & serving details

Format: Capsule
Serving: 4 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£0.88per day£26.49 per pack

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Active form: Bisglycinate Oxide Citrate
Daily dose: 300 mgelemental magnesiumWithin commonly studied range

Formulation & serving details

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

Full ingredients and formulation →

£0.39per day£11.55 per pack

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Active form: L-ThreonateMagtein claimed
Daily dose: 144 mgelemental magnesiumBelow commonly studied range

Formulation & serving details

Format: Capsule
Serving: 4 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£1.30per day£38.99 per pack

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Active form: Food-grown complex
Daily dose: 80 mgelemental magnesiumBelow commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 60 capsules

Full ingredients and formulation →

£0.68per day£20.50 per pack

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Active form: Malate
Daily dose: 180 mgelemental magnesiumBelow commonly studied range

Formulation & serving details

Format: Capsule
Serving: 2 capsules
Servings/day: 1
Pack size: 120 capsules

Full ingredients and formulation →

£0.22per day£12.93 per pack

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Active form: Citrate
Daily dose: 150 mgelemental magnesiumBelow commonly studied range

Formulation & serving details

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

Full ingredients and formulation →

£0.25per day£22.35 per pack

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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.

Magnesium forms explained

The form used affects both the elemental percentage and how well it's absorbed - a higher headline mg figure does not automatically mean more usable magnesium. Capsule, tablet and powder are just delivery formats - use the Format filter above to narrow by those; the form itself is what determines elemental content and absorption.

Oxide

Inorganic magnesium compound

Compare: Declared elemental magnesium
Evidence context: Small studies find lower absorption than several soluble salts

Compound mass and elemental magnesium are different. An absorption result does not establish how well this product treats a symptom.

Citrate

Magnesium associated with citrate

Compare: Elemental amount and full serving
Evidence context: A soluble form discussed in comparative absorption research

Check whether citrate is used alone or blended with oxide. A supplement is different from a magnesium-citrate laxative medicine.

Bisglycinate (Glycinate)

Magnesium associated with glycine

Compare: Actual ingredients, including any oxide
Evidence context: The name alone does not prove better sleep or tolerance

A clear total does not reveal how much magnesium each salt contributes in a blend. See the sleep evidence below for the specific preparations studied.

Malate

Magnesium associated with malate

Compare: Declared elemental amount
Evidence context: Muscle and energy marketing is not a clinical result

Compare the actual formula and dose. Do not assume that a named salt establishes superior symptom relief.

L-Threonate

Magnesium associated with threonate

Compare: Elemental amount as well as compound mass
Branded source: Magtein where disclosed

A branded ingredient and its research are separate from verified testing of the finished product.

Taurate

Magnesium associated with taurine

Compare: Elemental magnesium and other ingredients
Evidence context: A cardiovascular claim needs outcome-specific evidence

Often appears in blends; do not infer the contribution of each form from the total.

Hydroxide

Inorganic magnesium compound

Compare: Elemental amount and intended use
Medicine distinction: Also used in laxative and antacid preparations

Follow the specific product instructions. A medicine regimen is not a general nutritional supplement target.

Magnesium dosage: read the elemental amount

Compound weight versus elemental magnesium

The WeightWorld listing declares 1,420 mg of compound supplying 200 mg elemental magnesium in two capsules. Lindens headlines 500 mg magnesium oxide but declares 300 mg elemental. These are recorded label amounts, not independent measurements. Use the product analyses linked in the comparison to inspect each source.

Daily cost and the value calculation
Measure	Calculation	Use it to compare
Price per day	Pack price ÷ recorded daily servings	The cost of following the stated comparison serving.
Price per 100 mg elemental	Pack price ÷ total declared elemental mg in pack × 100	Used in the value score; the comparison table displays daily cost.

The 100 mg unit is arithmetic, not a recommended dose. A blend with undisclosed contributions retains its total elemental figure but carries a review note; we do not invent the share from each salt.

UK intake context

The NHS gives total daily needs of 300 mg for men and 270 mg for women aged 19–64, usually obtainable from a varied diet. These include food, not extra supplement targets. NHS magnesium guidance.

Magnesium glycinate vs citrate, oxide and threonate

Choosing a form: label facts and evidence limits
Form	What to inspect	Useful distinction
Glycinate / bisglycinate	Declared elemental amount; oxide or other salts in the ingredients. Compare glycinate products.	The name alone does not prove better sleep or tolerance.
Citrate	Check whether it is citrate alone or an oxide-containing blend. Compare citrate products.	Absorption evidence and symptom relief are different questions.
Oxide	Separate compound mass from elemental magnesium.	Small studies generally find lower absorption than several soluble salts.
L-threonate / Magtein	Read the elemental quantity as well as the larger compound number.	A branded-source claim is separate from verified testing.
Multi-form blends	Check if the amount supplied by each salt is disclosed.	A clear total does not identify each component’s contribution.

NIH ODS reviews comparative absorption. It does not establish a universal best form for every person or goal. Our scores evaluate the disclosed record and value; they do not rank absorption or treatment outcomes.

Magnesium benefits: sleep, cramps and anxiety

Evidence by goal
Goal	Evidence strength	What was assessed	Typical study context	Main limitation
Sleep	Modest signals; uncertainty remains	Different salts, including bisglycinate	Small older trials plus a four-week 2025 trial	Short follow-up and subjective outcomes; no universal best form
Common muscle cramps in older adults	Meaningful prevention benefit unlikely	Various preparations	Cochrane review	Pregnancy evidence differs; exercise cramps were not supported by eligible trials
Anxiety	Suggestive, not conclusive	Some combinations with other ingredients	Heterogeneous intervention studies	Cannot isolate magnesium in combination trials

Read the full evidence-by-goal detail

Sleep: include the newer trials

A 2021 review in older adults found low or very low quality evidence from three trials. A 2025 bisglycinate trial subsequently reported a small improvement in self-reported insomnia severity after four weeks using 250 mg elemental magnesium daily. Short duration and subjective outcomes limit certainty; this does not show superiority over citrate or verify a product in this table.

Leg and muscle cramps

The Cochrane review found a meaningful preventive benefit unlikely for common cramps in older adults. Pregnancy findings were inconsistent; the review did not provide eligible trial evidence for exercise-associated cramps.

Anxiety

A 2024 systematic review found promising results in some studies, but small samples, mixed populations and other active ingredients limited interpretation. These findings do not establish magnesium as an anxiety treatment.

When to take magnesium: morning or before bed?

No timing comparison here establishes a universal morning-versus-evening winner. The 2025 bisglycinate trial used 30–60 minutes before bed, but did not compare that schedule with morning use. Treat the schedule as study context, not proof of an optimal bedtime window.

Check the label and any medicine-spacing instructions below. Keep the stated elemental amount and full serving in view; a bedtime product name is not evidence of a sleep benefit.

Magnesium side effects and safe-dose context

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

Kidney disease or impaired kidney function
Medicines that interact with magnesium
Multiple supplements, antacids or laxatives supplying magnesium
A label serving above the NHS supplemental-dose context

Supplemental doses above 400 mg can cause diarrhoea; the NHS says 400 mg or less is unlikely to cause harm for most people, with uncertainty about long-term high doses. This is general context, not a target. NHS guidance.

Kidney impairment increases toxicity risk. NIH ODS safety review. High-dose entries are flagged and excluded from our top-pick selection.

Magnesium interactions, vitamin D and zinc

Magnesium can interfere with absorption of some antibiotics and bisphosphonates. Diuretics and proton-pump inhibitors can affect magnesium status. Check spacing and suitability with a pharmacist using the specific medicine instructions. NIH interaction guidance.

For products containing vitamin D or zinc, compare each declared amount separately. Check overlapping ingredients and costs across your products; A combination label is not evidence that everyone needs all its ingredients.

Who might consider it?

Consider whether the goal is filling a dietary gap, following advice after a clinical assessment, or trying to address a symptom. These are different decisions. Review food sources and the amount already supplied by other products first. The comparison is designed to make label differences visible; it cannot choose a dose or diagnose the cause of fatigue, cramps or poor sleep.

How we assess magnesium quality

Testing review pending means the product evidence review is unfinished; it is not a failed test or a finding that no report exists. Open the Testing status for the current record and its sources.

A useful review checks the finished product, laboratory, batch, identity and elemental-magnesium results, relevant contaminants and any certification scope. Manufacturer claims and raw-material documents are not automatically independent evidence for the bottle.

Pending testing is excluded from provisional scores. The other components assess documented formulation, dose and label clarity, manufacturer information and value. The existing value calculation compares cost per 100 mg elemental magnesium; the table shows daily cost and daily dose for simpler comparison. Prime and commission contribute no points. Read the scoring method.

Magnesium deficiency and blood testing

Fatigue, weakness and cramps can occur with magnesium deficiency but do not diagnose it. Serum magnesium is commonly measured, yet does not fully reflect total stores. Interpret results alongside diet, medicines and kidney function with a clinician. NIH deficiency and assessment guidance.

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 certification0

Verified independent evidence1

Manufacturer COA1

Testing claimed11

No public evidence located10

What does magnesium cost?

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

£0.07Lowest daily cost

£0.17Median daily cost

£1.30Highest daily cost

Your questions, answered

What is the difference between magnesium glycinate and citrate?

They are different magnesium salts. Compare the declared elemental dose, ingredients and cost in the form guide, which separates absorption evidence from claims about symptoms.

Which magnesium is best for sleep?

The available studies do not establish one form as best. The sleep evidence summary includes both the older review and the small benefit reported in a newer bisglycinate trial.

How much magnesium should I take per day?

UK total-intake guidance includes magnesium from food. It is not a supplement target. Read the elemental-dose guide and supplemental safety context.

How long before bed should I take magnesium?

One recent trial used 30–60 minutes, but did not compare different times. That does not establish an ideal schedule. See the timing section and trial source.

Does magnesium help leg cramps?

For common cramps in older adults, the Cochrane review did not find a meaningful preventive benefit likely. See the cramp evidence and population limits.

Can I take magnesium with vitamin D or zinc?

Check each ingredient’s amount and duplicates across products. The combination and interaction guide explains what to review; an added ingredient is not an automatic benefit.

What happens if I take too much magnesium?

Diarrhoea can occur at high supplemental doses, and kidney impairment changes the risk. Read the safety panel and NHS/NIH sources before choosing a serving.

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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Magnesium forms explained

Oxide

Citrate

Bisglycinate (Glycinate)

Malate

L-Threonate

Taurate

Hydroxide

Magnesium dosage: read the elemental amount

Compound weight versus elemental magnesium

UK intake context

Magnesium glycinate vs citrate, oxide and threonate

Magnesium benefits: sleep, cramps and anxiety

Sleep: include the newer trials

Leg and muscle cramps

Anxiety

When to take magnesium: morning or before bed?

Magnesium side effects and safe-dose context

Magnesium interactions, vitamin D and zinc

Who might consider it?

How we assess magnesium quality

Magnesium deficiency and blood testing

Testing evidence in this comparison

What does magnesium cost?

Your questions, answered

Sources & methodology