The fast facts
- Vitamin B12 is a nutrient the body needs every day, and the amount it needs is small: the adult reference intake is 2.4 micrograms (Institute of Medicine, Dietary Reference Intakes, 1998). Two situations make a supplement useful — a diet without animal-source foods, and the age-related decline in releasing B12 from food protein — and both point at the crystalline form carried in supplements and fortified foods.
- Here, unusually, the number on the front is the vitamin itself: no carrier to correct for, no extract ratio to unpick. What it is not is a dial. Absorption is capped. The carrier-mediated route saturates after a couple of micrograms per dose, and the rest crosses the gut wall by passive diffusion at very low efficiency. A 2,000 microgram tablet does not deliver eight hundred times what a 2.4 microgram one does.
- One larger amount does have a published reason behind it: 500 micrograms a day. A 2006 review in Nutrition Reviews identified that as the oral amount of the crystalline form that normalised biochemical markers in older adults with poor B12 status — 5% to more than 20% of them, depending on the cut-off. That is the figure worth looking for on a panel, printed beside the form.
A quick look at the best B12 supplements
- Best overall, the studied amount offered as a choice: Jarrow Formulas Methyl B-12 500 mcg Cherry | Skip to review
- Best complete formula, every active printed with its own amount: Weal Focus | Skip to review
- Best value, seven cents a day for B12 alone: Nutricost Vitamin B12 2,000 mcg | Skip to review
- Best lozenge, nothing to swallow and the folate named on the front: Country Life Vitamin B12 with Folate 500 mcg | Skip to review
- Best-specified label, named down to the branded folate: Pure Encapsulations B12 Folate | Skip to review
What the B12 number does
Vitamin B12 is the one shelf in this category where the number printed on the pack is almost certainly the amount of the actual vitamin. No 50% carrier to correct for, as with alpha-GPC; no extract ratio to unpick, as with mushrooms. What replaces those problems is stranger. The numbers here run from 500 micrograms to 2,000, the adult reference intake is 2.4, and the body's main absorption route saturates after a couple of micrograms per dose. Five labels were read to work out which of those numbers is doing anything.
Panels came from the NIH Dietary Supplement Label Database; prices from each brand's own shopping page, and the cost a day below is that price divided by the servings in the pack. The five factors and their weights are set out under How we chose. Read that way, Jarrow Formulas comes first for pairing the amount that has a published reason behind it with a format someone will keep taking, Weal Focus second for the most completely printed panel here, and the most exactly specified label of the five comes last, because it asks three times the going rate of this shelf for a number it never explains.
Our recommendation
The short answer, before the reasoning: Jarrow Formulas Methyl B-12 500 mcg Cherry is the pick on this shelf — the one amount with a published rationale behind it, in a form someone will keep taking, at ten cents a day. If you would rather have that amount inside a fully printed formula than on its own, Weal Focus is the one to read next.
This is the best-labelled shelf in the category and the worst-proportioned. All five name their form of B12 — something neither the alpha-GPC shelf nor the lion's mane shelf comes close to. The largest amount here, 2,000 micrograms, arrives with no published basis at all, on a shelf where absorption saturates in the low single figures. Disclosure and proportion are independent virtues, and this category has one of them. What the testing language is worth is in what "third-party tested" actually means.
On the declared factors the first pick is Jarrow Formulas Methyl B-12 500 mcg Cherry: 500 mcg of methylcobalamin, the one amount with a published rationale, in a chewable the brand also publishes at 1,000, 2,500 and 5,000 mcg, at ten cents a day. If you want that amount inside a fully printed formula rather than on its own, Weal Focus is second; if you want B12 and nothing else, Nutricost is seven cents a day.
#1 Best overall, the studied amount offered as a choice
Methyl B-12 500 mcg Cherry
by Jarrow Formulas
- Vitamin B12: 500 mcg as methylcobalamin per chewable tablet
- Range: the same tablet sold at 500, 1,000, 2,500 and 5,000 mcg
- Supply: 2 × 100 chewables, sold as a two-bottle pack
- Cost: $0.10 per day
*Two-bottle pack; one-time price observed August 2026.
The Cognitive Review's verdict
8.8/10 desk score
- Form, named and accounted for
- 9.0
- The amount, and whether it is yours to choose
- 10
- The rest of the panel
- 7.0
- The format
- 9.0
- Cost per day
- 9.0
First because it gets the two hardest things right together: a defensible amount and a format someone will keep taking. 500 mcg is the one figure on this shelf with a published rationale behind it, and offering the same tablet across a tenfold range treats the number as a decision rather than a boast. Ten cents a day, and the only thing it asks of a buyer is a chewable's sweeteners.
Pros
- The one label here that treats the amount as a decision. The same tablet is published at 500, 1,000, 2,500 and 5,000 mcg, and the range starts at the figure with a rationale behind it rather than at the biggest number that would fit
- 500 mcg as methylcobalamin, in a chewable for people who would rather not swallow another capsule, at ten cents a day
Cons
- A flavoured chewable carries sweeteners and flavourings a plain capsule does not, and nothing else in the serving is an active
- Sold as a two-bottle pack, so the table shows the pack price; the per-bottle figure is our division rather than a printed figure
Product details: 500 mcg methylcobalamin per chewable · 2 × 100 tablets · $20 · sold by Jarrow Formulas.
#2 Best complete formula, every active printed with its own amount
Weal Focus
by Weal Supplements
- Vitamin B12: 500 mcg as methylcobalamin per serving (2 capsules), printed with its Daily Value
- Also on the panel: alpha-GPC 300 mg, lion's mane 400 mg (fruiting body, ≥25% beta-glucans), L-theanine 200 mg, zinc 15 mg
- Supply: 60 capsules · 30 days
- Capsule: HPMC, no titanium dioxide
*$40 on subscription, $45 one-time; observed September 2026.
The Cognitive Review's verdict
8.2/10 desk score
- Form, named and accounted for
- 9.5
- The amount, and whether it is yours to choose
- 9.0
- The rest of the panel
- 10
- The format
- 8.0
- Cost per day
- 2.0
Second, and first on the rest of the panel. It prints the same 500 mcg of methylcobalamin as the tablet above it, and prints four other actives beside it with their amounts — the most complete disclosure on this page, and the factor it wins outright. What keeps it second is the shape of the purchase: at $1.50 a day this is a focus formula that happens to carry a well-judged B12 amount, not a way to buy B12.
Pros
- 500 mcg as methylcobalamin — the amount with a published rationale behind it, not the largest number that would fit on a pouch — printed with its percentage of Daily Value, so the 20,833% figure is on the panel rather than left to be worked out
- The most completely printed panel here: alpha-GPC, lion's mane, L-theanine and zinc sit beside the B12, each with its own amount and no proprietary blend
Cons
- The dearest B12 here by a wide margin at $1.50 a day, because the serving carries four other actives — not a purchase to make for the B12 alone
- A five-active formula, so the amount is not adjustable, and a swallowed capsule with no lozenge or chewable option
Product details: 500 mcg methylcobalamin plus four named actives per 2-capsule serving · 60 capsules · 30-day supply · from $40 · sold by Weal Supplements.
#3 Best value, seven cents a day for B12 alone
Vitamin B12 2,000 mcg
by Nutricost
- Vitamin B12: 2,000 mcg as methylcobalamin per capsule, 1 capsule per serving
- Nothing else in the capsule
- Supply: 240 capsules
- Cost: $0.05 per day
*2,000 mcg / 240-count bottle; price read on the brand's own site, September 2026.
The Cognitive Review's verdict
7.9/10 desk score
- Form, named and accounted for
- 9.0
- The amount, and whether it is yours to choose
- 5.5
- The rest of the panel
- 9.0
- The format
- 8.0
- Cost per day
- 9.6
Third, and the answer for anyone here for B12 alone: nothing else in the capsule, seven cents a day, and still the cheapest here by some way. What holds it back is the number on the front. 2,000 mcg is a marketing figure rather than a studied one, on a shelf where absorption saturates in the low single figures, and the amount is the heaviest of the five factors.
Pros
- The price floor of this page: seven cents a day from a 240-capsule bottle at $12
- Methylcobalamin named, one capsule per serving, nothing else in the capsule
Cons
- 2,000 mcg is roughly 830 times the reference intake, with no reason offered for that figure rather than a smaller one, and no smaller one is offered
- No lot-numbered certificate, so the shopping page's testing language cannot be matched to the bottle
Product details: 2,000 mcg methylcobalamin per capsule · 240 capsules · $17 · sold by Nutricost.
#4 Best lozenge, nothing to swallow and the folate named on the front
Vitamin B12 with Folate 500 mcg, Cherry
by Country Life
- Vitamin B12: 500 mcg as cyanocobalamin per lozenge
- Also on the panel: folate 667 mcg DFE, named in the product name
- Supply: 100 lozenges · 1 lozenge per serving
- Cost: $0.13 per day
*One-time price observed August 2026.
The Cognitive Review's verdict
7.8/10 desk score
- Form, named and accounted for
- 6.5
- The amount, and whether it is yours to choose
- 8.0
- The rest of the panel
- 7.5
- The format
- 9.5
- Cost per day
- 8.5
Fourth, and the easiest of the five to actually take. A well-judged 500 mcg in a format that asks nothing of someone who dislikes swallowing pills, with the extra ingredient named on the front where it belongs. It sits fourth because the form is named but never accounted for, and because the second ingredient is one a B12 buyer may not have chosen.
Pros
- The least demanding format here: a lozenge dissolves in the mouth, one lozenge is one serving, and there is nothing to swallow or chew
- 500 mcg alongside 667 mcg DFE of folate, and — unusually here — the second ingredient is in the product name rather than left to the panel; thirteen cents a day
Cons
- Cyanocobalamin rather than a form the category charges a premium for — a defensible choice, and the one choice on this page a pack leaves unexplained
- Folate has its own reasons to be taken or avoided, and a B12 buyer has not necessarily decided about it
Product details: 500 mcg cyanocobalamin with 667 mcg DFE folate per lozenge · 100 lozenges · $13 · sold by Country Life.
#5 Best-specified label, named down to the branded folate
B12 Folate
by Pure Encapsulations
- Vitamin B12: 800 mcg as methylcobalamin per capsule
- Also on the panel: folate 1,333 mcg DFE as Metafolin, a named branded L-5-MTHF material
- Supply: 120 capsules · 1 capsule per serving
- Cost: $0.33 per day
*120-capsule bottle; one-time price observed September 2026.
The Cognitive Review's verdict
7.7/10 desk score
- Form, named and accounted for
- 10
- The amount, and whether it is yours to choose
- 6.0
- The rest of the panel
- 9.0
- The format
- 8.0
- Cost per day
- 5.9
Fifth, and the most exactly written label on this page. Every molecule is named, the second active down to its branded material, which is the standard the rest of the shelf is measured against. What keeps it last is the pair of numbers the label does not argue for: 800 mcg, which sits between the amount with a published rationale and the round figures everyone else reaches for, at 33 cents a day when three of the four above it cost under fifteen cents.
Pros
- The most specific ingredient line here: methylcobalamin 800 mcg beside folate declared as Metafolin, a named branded L-5-MTHF material, at 1,333 mcg DFE
- Naming the branded material makes the specification a look-up — the standard rewarded on the L-theanine shelf
Cons
- Three times the going rate on this shelf: 33 cents a day against 13 for the lozenge, ten for the chewable and five for the capsule — for a panel that names its materials better, not one that carries more of them
- 800 mcg is unexplained: larger than the 500 mcg that has a published rationale (explained below the table), smaller than the round numbers the rest of the shelf reaches for
Product details: 800 mcg methylcobalamin with 1,333 mcg DFE Metafolin folate per capsule · 120 capsules · $40 · sold by Pure Encapsulations.
Comparing the best B12 supplements
| Product | Best for | Per serving | Form | Format | Observed price | Per day |
|---|---|---|---|---|---|---|
| Jarrow Methyl B-12 500 mcg Cherry | Best overall — the studied amount, offered as a choice | 500 mcg, also sold at 1,000, 2,500 and 5,000 | Methylcobalamin | Chewable | $20 / 2 × 100 | $0.10 |
| Weal Focus | The complete formula — five actives, each with its amount | 500 mcg | Methylcobalamin | Capsule | $45 / 60 | $1.50 |
| Nutricost Vitamin B12 2,000 mcg | Value, B12 alone | 2,000 mcg | Methylcobalamin | Capsule | $17 / 240 | $0.05 |
| Country Life B12 with Folate 500 mcg | Lozenge, folate on the front | 500 mcg + folate 667 mcg DFE | Cyanocobalamin | Lozenge | $13 / 100 | $0.13 |
| Pure Encapsulations B12 Folate | Best-specified label — the folate named to its branded material | 800 mcg + folate 1,333 mcg DFE | Methylcobalamin, with the folate named to its branded material | Capsule | $40 / 120 | $0.33 |
Panels from the NIH Dietary Supplement Label Database, read August 2026: Nutricost 306402 · Jarrow 307652 · Country Life 333221 · Pure Encapsulations 184302; Weal Focus from the brand's own published panel. Prices read the same week; the Jarrow figure is the two-bottle pack the brand sells, halved. Every figure in the "per serving" column is vitamin B12 itself rather than a standardised material — see below for where that stops being true.
How we chose the best B12 supplements
Chosen on one test: a reader holding the pack can check every factor without taking our word for it. Five factors, weighted, and the weights are printed here so the desk score can be checked too.
- Form, named and accounted for (20%): Cyanocobalamin, methylcobalamin, adenosylcobalamin and hydroxocobalamin are different molecules delivering the same vitamin. Every product here names one, which makes this the best-disclosed shelf in the category; what separates them is how far the naming goes — down to the branded material of a second active, or only as far as a word the pack never explains choosing.
- The amount, and whether it is yours to choose (30%): The RDA for adults is 2.4 mcg a day (Institute of Medicine, Dietary Reference Intakes, 1998). Everything here is a multiple of that in the hundreds or thousands. The question is not safety — the same report set no Tolerable Upper Intake Level for B12, for want of evidence of harm — but whether the extra buys anything, and whether the buyer picked the figure or inherited it. One higher amount has a researched rationale, 500 mcg a day in older adults with poor status, and it is set out under the research heading below. The heaviest weight, because it is the factor these five disagree on most.
- The rest of the panel (25%): Folate, calcium, sugar, flavourings — what else is in the serving, whether every part of it is printed with an amount, and whether the product name accounts for it.
- The format (10%): Capsule, chewable, lozenge, spray and gummy are all sold; three of them appear here, and a supplement that gets taken beats one that does not. A label may state its route; a label that says its route is better is making a claim, and this desk checked whether it did. None of the five does. The lightest weight, because all three formats here work.
- Cost per day (15%): At the printed serving, from the brand's own published price and count, at the largest size each brand sells. The spread on this shelf is wide enough to matter — seven cents a day to a dollar fifty — and it is the one factor a buyer settles before anything on the panel is put to the test.
The desk score is the weighted average of the five sub-scores on those weights, rounded to one decimal place, so it can be checked from the numbers on each card.
The one place the number is not the vitamin
On a finished capsule, tablet or gummy, the Supplement Facts figure is the vitamin, which is what lets the table above compare five products in one column. It stops being true on bulk powders, because B12 is potent enough that the raw material is sold pre-diluted onto a carrier — and the dilution goes in the product name. The same database lists, from one manufacturer, several tubs called "Vitamin B12 1% (Methylcobalamin)". That 1% matters: a hundred milligrams of that powder is one milligram of B12.
This is the class of error that produced a public correction on the alpha-GPC ranking. The difference is that alpha-GPC hides it on the finished pack and B12 hides it only on the raw ingredient. Which number is which is settled in the parenthetical: the panel declares the nutrient and the amount delivered, and any percentage quoted beside a raw material describes the powder the manufacturer bought rather than the dose in the capsule.
What the research says about the amount, and in whom
Two facts sit awkwardly together, and this shelf's marketing depends on nobody putting them side by side. The first is that absorption is capped: B12 is taken up by a carrier-mediated route that saturates after a couple of micrograms per dose, after which the remainder crosses the gut wall by passive diffusion at very low efficiency. A 2,000 mcg tablet does not deliver eight hundred times what a 2.4 mcg one does.
The second is that one larger amount does have a rationale. A 2006 review in Nutrition Reviews named it: 500 mcg a day of the crystalline form. That was the oral amount required to normalise biochemical markers in older adults with poor B12 status (Park & Johnson, Nutrition Reviews, 2006; review of the oral-dose literature in adults over 50). The same review explains why the form matters. Adults over 50 are advised to meet the RDA from the crystalline form found in supplements and fortified foods. That is because releasing B12 bound to food protein depends on stomach acid and enzymes that decline with age in a substantial minority. The review put the share of older adults with marginal or low status at 5% to more than 20%, depending on the cut-off.
That is why 500 mcg appears three times in the table. Nothing establishes that 2,000 mcg does more, and the product carrying it does not claim it does — it prints the number and lets it speak.
Who actually needs which — and where the answer does not come from
The honest version of this section is short. Which form and amount suits any individual is a blood test and a doctor's question, and no ranking page has access to either. What a page like this can do is narrow the shelf: every panel here names its form, the one amount with a studied reason behind it, in older adults, is 500 mcg, and absorption is capped well below the largest numbers on offer. The two dietary situations that recur in the literature — diets without animal-source foods, and the age-related decline in releasing B12 from food protein — both point at the crystalline form rather than at any brand. Several common long-term medications are also associated with lower B12 readings in observational studies. Anyone wondering about their own levels should ask for the test rather than reason from a pack. Why a B-vitamin sits in a focus formula at all is in the forgotten nutrient.
Label panels for every product here were read from the NIH Dietary Supplement Label Database in August 2026. Every trial cited is named in the text with its journal, year and the population studied.
Frequently asked questions
Which form of B12 should be on the label?
Cyanocobalamin, methylcobalamin, adenosylcobalamin and hydroxocobalamin are different molecules delivering the same vitamin, and every product on this page names one. Methylcobalamin is the form the body uses directly and the one the category charges a premium for; the Country Life lozenge uses cyanocobalamin, a defensible choice its pack does not explain. Which form and amount suits any individual is a blood test and a doctor's question.
How much B12 is enough, and does 2,000 mcg do more than 500?
The adult reference intake is 2.4 mcg a day. Absorption is capped: the carrier-mediated route saturates after a couple of micrograms per dose, and the remainder crosses the gut wall by passive diffusion at very low efficiency, so a 2,000 mcg tablet does not deliver eight hundred times what a 2.4 mcg one does. The one larger amount with a published rationale is 500 mcg a day, which a 2006 review in Nutrition Reviews identified as the oral amount that normalised biochemical markers in older adults with poor B12 status. Nothing establishes that 2,000 mcg does more.
Is a large amount of B12 safe, and is the number on the pack really the vitamin?
The 1998 Institute of Medicine report that set the 2.4 mcg reference intake set no Tolerable Upper Intake Level for B12, for want of evidence of harm, so the question on this shelf is whether the extra buys anything rather than whether it does damage. On a finished capsule, tablet or gummy the Supplement Facts figure is the vitamin itself. It stops being true only on bulk powders, where B12 is sold pre-diluted onto a carrier and the dilution goes in the product name — "Vitamin B12 1%" means a hundred milligrams of powder is one milligram of B12.
Why rank a cherry-flavoured chewable first?
Because the amount carries the most weight of the five factors, 30 of 100, and the Jarrow tablet is the only label here that offers 500 mcg — the one amount with a published rationale behind it — as a choice rather than a default, with the same tablet published at 500, 1,000, 2,500 and 5,000 mcg, at ten cents a day. Weal Focus is second: the same 500 mcg of methylcobalamin with four other actives each printed with its own amount, which wins the rest-of-the-panel factor outright, at $1.50 a day. Nutricost wins cost outright at seven cents a day and is the answer for anyone here for B12 alone; what holds it off the top is that 2,000 mcg is a marketing figure rather than a studied one. The weights are set out under How we chose.
Updated August 26, 2026