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Vitamin B12 Supplements
Compare UK vitamin B12 supplements by disclosed form, daily micrograms, delivery format and price. Explore methylcobalamin, cyanocobalamin and mixed forms, with guidance on vegan diets, deficiency and blood tests.
We may earn a commission from qualifying purchases at no extra cost to you. Affiliate relationships never determine our scores or rankings.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
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.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
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.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Testing claimed
Manufacturer statement
WeightWorld’s own product page says the tablets are “Backed by our 90-day money-back guarantee” and the brand’s separate “Third-Party Tested Supplements” page says “we send our supplements to accredited third-party laboratories to verify purity and quality” and that “A wide range of our wellness supplements undergo third-party testing to screen for heavy metals.” However, I did not find an independently verifiable COA/lab report or a certifying-body registry entry for this specific Vitamin B12 1000µg product.
Daily B12 and daily cost use the same recorded label serving. µg and mcg both mean micrograms; 1 mg = 1,000µg. Dietary requirements, label NRV and deficiency treatment are different contexts. Neither a larger dose nor a particular form automatically earns a higher score. Read the dose guide ↓
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.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nutrasource registry page for Igennus Super B12 Complex: "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."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
WeightWorld’s own product page says the tablets are “Backed by our 90-day money-back guarantee” and the brand’s separate “Third-Party Tested Supplements” page says “we send our supplements to accredited third-party laboratories to verify purity and quality” and that “A wide range of our wellness supplements undergo third-party testing to screen for heavy metals.” However, I did not find an independently verifiable COA/lab report or a certifying-body registry entry for this specific Vitamin B12 1000µg product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing image includes a self-asserted badge reading "LAB TESTED" for the product, but I did not find any independently verifiable COA, lab report, or certifying-body registry entry for this exact Health4All B12 Cyanocobalamin 50mcg product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing title says "3rd Party Tested" and the Zipvit product page says "4/4 TESTS PASSED", "1/1 CLAIMS VERIFIED", and "INDEPENDENTLY LAB TESTED" with a "SEE LAB RESULTS" link, but I did not find an independently verifiable lab report or certifying-body registry entry for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nutravita’s Ingredients page says: “You’ll be pleased to know that our products do not include any genetically modified ingredients and any ingredient selected goes through strict testing to make sure it complies with EU standards.” It also says: “The testing is done in-house at the manufacturing site…” and describes disintegration/friability tests. On the B12 Amazon listing, the product page itself only shows marketing claims like GMP-certified facilities and “bioavailable form,” not an independently verifiable third-party test/certification for this specific B12 product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
"All products are subjected to a strict quality assurance system put in place by our on-site laboratory, to test each product at every stage: from raw material to finished product."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "Manufactured To GMP Standards" and "quality checked to the standard of the industry recognised GMP (Good Manufacturing Practice)," but I found no actual third-party test/certification claim for this specific product and no independently verifiable registry match.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Horbäach site says: “We put our products to the test, ensuring maximum potency from each formula we produce” and “test each individual product to ensure it meets our strict Quality Assurance Standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "FDA Compliant" and that "Due to clinical research, we are now encapsulating our true activated vitamins (Co-enzymes) in Delayed Release (DR) capsules"; the product page also says "Our formulations are carefully constructed using a combined 70+ years of clinical research and experience" and the site certificates page claims ISO/SALSA/FDA/Soil Association certifications for the company, but I did not find any independent product-specific COA or registry entry for this B12 capsule product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "Third-party lab tested + Vegan" and the product page also shows a "Third Party Lab Tested" badge, but I did not find an independently verifiable COA/lab report or a certifying-body registry entry for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and "We put our products to the test, ensuring maximum potency from each formula we produce."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Novomins’ own product page for Vitamin B12 Gummies says "Laborgeprüft", "Von Drittanbietern getestet", "9/9 TESTS BESTANDEN", "4/4 AUSSAGEN VERIFIZIERT", and "UNABHÄNGIG IM LABOR GETESTET"; the brand’s claims page also says every product is independently tested and third-party certified. However, I did not find an independently verifiable COA/lab report or a certifying-body registry page for this specific B12 product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
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.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nutrasource registry page for Igennus Super B12 Complex: "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."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
WeightWorld’s own product page says the tablets are “Backed by our 90-day money-back guarantee” and the brand’s separate “Third-Party Tested Supplements” page says “we send our supplements to accredited third-party laboratories to verify purity and quality” and that “A wide range of our wellness supplements undergo third-party testing to screen for heavy metals.” However, I did not find an independently verifiable COA/lab report or a certifying-body registry entry for this specific Vitamin B12 1000µg product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing image includes a self-asserted badge reading "LAB TESTED" for the product, but I did not find any independently verifiable COA, lab report, or certifying-body registry entry for this exact Health4All B12 Cyanocobalamin 50mcg product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing title says "3rd Party Tested" and the Zipvit product page says "4/4 TESTS PASSED", "1/1 CLAIMS VERIFIED", and "INDEPENDENTLY LAB TESTED" with a "SEE LAB RESULTS" link, but I did not find an independently verifiable lab report or certifying-body registry entry for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Nutravita’s Ingredients page says: “You’ll be pleased to know that our products do not include any genetically modified ingredients and any ingredient selected goes through strict testing to make sure it complies with EU standards.” It also says: “The testing is done in-house at the manufacturing site…” and describes disintegration/friability tests. On the B12 Amazon listing, the product page itself only shows marketing claims like GMP-certified facilities and “bioavailable form,” not an independently verifiable third-party test/certification for this specific B12 product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
"All products are subjected to a strict quality assurance system put in place by our on-site laboratory, to test each product at every stage: from raw material to finished product."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "Manufactured To GMP Standards" and "quality checked to the standard of the industry recognised GMP (Good Manufacturing Practice)," but I found no actual third-party test/certification claim for this specific product and no independently verifiable registry match.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Horbäach site says: “We put our products to the test, ensuring maximum potency from each formula we produce” and “test each individual product to ensure it meets our strict Quality Assurance Standards.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "FDA Compliant" and that "Due to clinical research, we are now encapsulating our true activated vitamins (Co-enzymes) in Delayed Release (DR) capsules"; the product page also says "Our formulations are carefully constructed using a combined 70+ years of clinical research and experience" and the site certificates page claims ISO/SALSA/FDA/Soil Association certifications for the company, but I did not find any independent product-specific COA or registry entry for this B12 capsule product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says the product is "Third-party lab tested + Vegan" and the product page also shows a "Third Party Lab Tested" badge, but I did not find an independently verifiable COA/lab report or a certifying-body registry entry for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "We constantly source the best ingredients worldwide, test each individual product to ensure it meets our strict Quality Assurance Standards" and "We put our products to the test, ensuring maximum potency from each formula we produce."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Novomins’ own product page for Vitamin B12 Gummies says "Laborgeprüft", "Von Drittanbietern getestet", "9/9 TESTS BESTANDEN", "4/4 AUSSAGEN VERIFIZIERT", and "UNABHÄNGIG IM LABOR GETESTET"; the brand’s claims page also says every product is independently tested and third-party certified. However, I did not find an independently verifiable COA/lab report or a certifying-body registry page for this specific B12 product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
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 B12 forms & labels explained
These are ingredient identities, not a ranking of absorption. Click a form in the comparison to return to its card. A disclosed chemical form is separate from whether the whole product is vegan or its contents have been independently tested.
Methylcobalamin
A coenzyme form of B12
On labels
Often called methylated or active B12
Comparison rule
No automatic score advantage over cyanocobalamin
A common retail form. An active-form label alone does not establish a better clinical outcome or make a particular high dose necessary.
Cyanocobalamin
A form the body converts
On labels
Often used in tablets and some gummies
Comparison rule
A valid B12 form, not a lower quality default
Its name should not be used to imply a retail product is ineffective. The reason for supplementation, dose and ability to absorb B12 matter more than marketing language.
Hydroxocobalamin
Also written hydroxycobalamin
On this page
Disclosed within mixed oral formulations
Clinical distinction
An oral product is not an injection
Hydroxocobalamin is used in UK injectable treatment. That does not make an oral hydroxo capsule interchangeable with prescribed injections.
Adenosylcobalamin
A coenzyme form of B12
Other name
5-deoxyadenosylcobalamin
On this page
Single-form capsules and mixed products
A blend containing adenosyl and methyl B12 does not prove that everyone needs both in a supplement. Individual form amounts are shown only where disclosed.
Mixed forms
More than one B12 ingredient
Read the pills
Each disclosed form is named separately
Read the dose
The daily figure is total B12, not the amount of each form
A 1,000µg three-form product does not supply 1,000µg of every ingredient. We do not divide a total into assumed equal shares.
Micrograms and milligrams
Reading B12 units
Same unit
µg = mcg = micrograms
Conversion
1 mg = 1,000µg
B12 is recorded in micrograms. The table shows one daily amount so a 1 mg headline cannot be mistaken for 1µg. A large NRV percentage is a label calculation, not an absorption percentage.
Sublingual B12
A delivery instruction
Meaning
Allow under the tongue as directed
Evidence
No automatic absorption bonus
Sprays, drops and dissolving tablets can be practical preferences. They are not presumed equivalent to an injection or inherently more effective than swallowed tablets.
How much vitamin B12? UK dose context
Different numbers answer different questions
Context
What it means
Dietary requirement
NHS guidance gives about 1.5µg/day for adults aged 19–64. This is a nutritional requirement, not a treatment dose.
Label NRV
The B12 nutrient reference value is 2.5µg. It is used for label percentages: 1,000µg ÷ 2.5µg × 100 = 40,000%. It is not the proportion absorbed. UK reference-value table.
Vegan maintenance
The Vegan Society describes reliable fortified foods or a supplement supplying at least 10µg daily, or at least 2,000µg weekly. These are alternative maintenance approaches for normal absorption, not deficiency treatment. Frequency matters; a weekly dose is not simply interchangeable with its arithmetic daily average.
Retail serving
This table follows the confirmed adult label. It marks quarter-tablet servings and the chosen basis where a label permits a range. Dose and price/day always use the same basis.
Deficiency treatment
NHS cyanocobalamin medicine guidance describes 50–150µg daily for diet-related deficiency and different, sometimes much larger, prescribed doses for other causes. Treatment is chosen and monitored clinically; do not use the product ranking to set it.
There is no universal “commonly studied range” badge for B12. A maintenance intake, a medicine dose and a high-strength retail formulation serve different purposes. “Lower-dose tablet” in our picks means 100µg/day or less within this comparison set; it is not an official range.
Vitamin B12 benefits: role versus extra benefit
B12 supports normal blood-cell formation and nervous-system function. Correcting a deficiency is different from expecting additional energy when B12 status is already adequate. NIH ODS consumer overview.
Our provisional score reflects disclosed formulation, serving clarity, daily cost and manufacturer/label transparency. It measures neither absorbed B12 nor your likelihood of benefit. Detailed testing research is pending; a laboratory claim on Amazon is not verified evidence.
Evidence by goal
Evidence by goal
Goal
Evidence strength
What was assessed
Typical study context
Main limitation
Correcting deficiency
Established clinical use
Oral or injected B12 chosen for the cause
Individual treatment and follow-up
Retail products cannot replace an assessment.
Vegan dietary adequacy
Established nutrition need
Reliable fortified foods or supplementation
Maintenance with normal absorption
Diet may not be the only reason for low B12.
Extra energy without deficiency
Benefit not established
Additional B12 in people with adequate status
Separate nutrition claims from symptom treatment
Tiredness has many possible causes.
Memory and cognition
No general benefit established
Supplementation beyond correcting deficiency
Studies differ in population and baseline status
A cognitive symptom needs assessment.
Sublingual or methylated superiority
No automatic advantage established
Oral delivery and disclosed B12 forms
Dose and study design affect comparisons
A seller claim does not establish clinical superiority.
Read the full evidence-by-goal detail
Form and absorption
NIH ODS’s professional review finds no evidence that supplement absorption rates differ by B12 form, and no demonstrated efficacy difference between oral and sublingual preparations. The fraction absorbed falls at larger doses. We do not turn seller claims into multipliers.
A symptom is not a diagnosis
Tiredness, a sore tongue or memory changes have several possible causes. B12 deficiency can also affect nerves without anaemia. NHS symptom guidance explains why persistent symptoms merit assessment.
Treating the cause
NHS treatment guidance distinguishes dietary deficiency from absorption problems. Tablets or injections may be needed, sometimes long term. Continue an established treatment plan unless your clinician changes it.
When and how to take B12
Follow the particular label
Some products are swallowed with food; others dissolve under the tongue or are sprayed inside the cheek. Use the listed directions. Liquid droppers differ: eight drops on one product need not equal eight drops on another.
Morning or evening?
Choose a consistent time compatible with the directions; this comparison does not claim a universal best hour. Prescribed cyanocobalamin tablets are usually taken on an empty stomach, but that medicine instruction should not be imposed on every retail gummy or spray.
Opening and measuring
Shake or prime a spray where instructed. Follow storage and opened shelf-life rules. Declared bottle yield may be reduced by priming, spills or discarded expired liquid; it is not a guarantee of usable days.
Vitamin B12 safety & side effects
Who should be cautious?If any of the following apply to you, speak to a healthcare professional before taking Vitamin B12 - see the full detail below for why.
Known cobalt allergy or a previous reaction to B12
Symptoms suggesting deficiency, or an existing B12 treatment plan
Pregnancy, breastfeeding or choosing a supplement for a child
Gastrointestinal surgery, absorption problems or medicines affecting B12
The NHS says 2 mg (2,000µg) or less daily in supplements is unlikely to cause harm. This is safety context, not a target or a formal upper limit. NIH ODS reports no established tolerable upper intake level for B12; that does not show that ever-higher amounts add benefit.
Persistent or neurological symptoms
Seek medical assessment for persistent unexplained symptoms, particularly numbness, pins and needles or balance changes. Untreated deficiency can cause lasting problems. NHS advice. Do not wait for a retail supplement to prove whether you are deficient.
Known cobalt allergy
MHRA guidance flags sensitivity reactions to hydroxocobalamin and cyanocobalamin medicines in people with cobalt allergy. Tell a pharmacist or prescriber about a known allergy; seek urgent help for a severe allergic reaction. Do not stop medically necessary treatment without advice.
Check the whole formula
Gummies may contain sugars; dissolving tablets and sprays may use polyols or flavourings. A vegan claim does not mean allergen-free. The full analysis records disclosed ingredients and where allergen information remains unknown.
Medicines, folate and added ingredients
Metformin
The MHRA identifies reduced B12 as a common metformin side effect, with higher risk at larger doses and longer use. A clinician may arrange testing or monitoring. Continue metformin unless your prescriber advises otherwise.
Acid-suppressing medicines
Proton pump inhibitors and H2 blockers can affect B12 absorption from food. Tell your clinician what you take if investigating low B12; do not stop prescribed medication yourself. NIH ODS medicine interactions.
Folate and other B vitamins
Folic acid treatment can obscure an underlying B12 deficiency while neurological problems remain. NHS guidance explains checking B12 before folate treatment. A B12/folate or B-complex product is not automatically necessary; compare added quantities across your supplements.
Vegan diets, food and deficiency symptoms
Vegan and vegetarian diets
The Vegan Society recommends dependable fortified foods or supplements. Check plant milk, cereal and nutritional yeast labels: they are not all fortified. Unfortified plant foods should not be assumed to provide reliable B12.
Food sources
Meat, fish, milk, cheese and eggs can provide B12. Fortified foods offer alternatives. NHS food guidance. A diet containing B12 does not rule out poor absorption.
Beyond diet
A clinician considers symptoms, blood results and potential causes, including absorption problems. A low result is not automatically explained by a vegan diet; nor does a normal-looking result necessarily settle persistent symptoms. NHS diagnosis guidance.
If you are comparing other nutrients in a plant-based diet, the existing vitamin D and vegan omega-3 comparisons show their own dietary and formulation considerations.
What testing claims can tell you
Testing review pending
A pending label means the product evidence review is unfinished. Brand statements about GMP, laboratory testing or certificates require checks against the relevant finished product and batch. Open each product’s current status and sources.
What to look for
A useful report identifies the product, batch, laboratory, method, date and measured result. Ingredient identity and declared B12 content are different checks from microbiology or contaminants. A generic certificate need not establish this bottle’s potency.
What the score includes
Testing contributes no weight until researched. Remaining displayed weights use the existing rounded increments. No bonus is given merely for methylated forms, a higher µg headline, sublingual delivery or a blend with more ingredients.
Serum cobalamin; commonly reported in ng/L or pmol/L. It includes B12 bound to different blood proteins.
Active B12
Holotranscobalamin, usually in pmol/L. This measures the fraction carried by transcobalamin; it is a different test from total B12.
MMA
Methylmalonic acid can help clarify an indeterminate B12 result when symptoms are present. Interpret it using the laboratory’s range and clinical context.
Folate and blood count
These help assess related deficiencies and blood-cell changes. A blood count alone cannot exclude B12 deficiency. NHS diagnostic context.
NICE NG239 uses total or active B12 initially in most circumstances. Its indeterminate bands are total B12 180–350 ng/L (133–258 pmol/L), or active B12 25–70 pmol/L. These guide investigation, not self-diagnosis; validated local thresholds can differ.
Tell the clinician about supplements. B12 can raise blood measurements without fully treating an underlying deficiency. Where possible, diagnostic samples precede replacement, but urgent treatment must not be delayed. Do not withhold prescribed B12 yourself. Symptoms, history and sometimes further tests matter alongside one number.
A commercial blood test does not choose a dose or replace follow-up. Use the laboratory’s units and supplied range, and discuss unclear or discordant results with a clinician.
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 certification2
Verified independent evidence0
Manufacturer COA0
Testing claimed12
No public evidence located10
What does vitamin b12 cost?
Current UK comparison set, based on the daily serving shown on each label.
£0.02Lowest daily cost
£0.10Median daily cost
£0.67Highest daily cost
Price insights
Shown only where the underlying product data is reliable.
This page does not rank it automatically higher. Both are B12 forms; the evidence does not establish one best retail form for everyone. See the forms and evidence sections.
Is 1,000µg the same as 1 mg?
Yes. µg and mcg both mean micrograms; 1 mg equals 1,000µg. Dose and price/day use the same recorded label serving.
Why does a B12 tablet say 40,000% NRV?
The label reference is 2.5µg. A 1,000µg serving is 40,000% of that reference; this is not an absorbed percentage or evidence that you need that amount.
How much B12 should a vegan take?
The dose guide separates Vegan Society maintenance options from treatment of deficiency. Your diet, product frequency and absorption history matter; do not select a treatment dose from the comparison score.
Do sprays work better than tablets?
They can be easier to use for some people, but this comparison gives no automatic absorption advantage. Follow the individual product’s mouth or tongue instructions.
Can I replace B12 injections with tablets or a spray?
Do not replace prescribed injections yourself. The reason for deficiency and any neurological involvement determine the clinical treatment plan.
Will B12 give me more energy?
Correcting deficiency can help deficiency-related symptoms. Extra energy in someone with adequate B12 is not established; unexplained tiredness deserves assessment.
Should I take B12 with food?
Follow the pack or prescription. Retail directions vary; the NHS empty-stomach instruction for cyanocobalamin medicine is not a rule for every gummy or spray.
Can a normal blood count rule out B12 deficiency?
No. Symptoms can occur without anaemia. Total or active B12 and other tests may be considered alongside symptoms and medical history.
Does taking B12 affect a blood test?
It can increase the measured level. Tell the clinician what you take and when you started; do not stop necessary treatment just to arrange a test.
Are all B12 supplements vegan?
No whole-product assumption is made from the vitamin form. Check the capsule, flavourings and stated dietary suitability. Unknown claims remain unknown here.
Why are some researched products absent?
Listings with unresolved dose, ingredient or serving conflicts are held in draft. Missing values are not guessed, and pending testing is not labelled no public evidence.
