In short:
- The best vitamin B12 supplement is judged on 4 points: form, dose, format and ingredients.
- EFSA sets the adequate intake for adults at 4 µg per day; most B12-only supplements provide 1,000 µg.
- Nutri&Co and Novoma, for example, offer methylcobalamin at 1,000 µg per capsule, for €19.90 for 4 months.
- A deficiency is confirmed by a blood test: ask a doctor before starting a course.
Choosing the best vitamin B12 supplement is not about finding a winning brand, but about reading a label correctly. Vitamin B12, or cobalamin, comes in four forms, at doses ranging from a few micrograms in a multivitamin to 1,000 µg in a dedicated supplement. This guide covers the points that matter, what EFSA and the US National Institutes of Health say about them, and two examples of supplements sold in France.
What to look for in a vitamin B12 supplement
The table below brings together the four points to check on a product page or label, with the reference value and what it tells you.
| Point | What to read | Reference value |
|---|---|---|
| Form | Methylcobalamin, adenosylcobalamin, hydroxocobalamin or cyanocobalamin | The first two are the active forms in the body |
| Dose per serving | Amount in µg and percentage of the NRV | NRV: 2.5 µg; adult adequate intake (EFSA): 4 µg per day |
| Intake rhythm | Number of capsules or drops per day or per week | To adjust with a health professional according to your needs |
| Format | Capsule, tablet, chewable tablet, drops | A plant-based capsule if you follow a plant-based diet |
| Ingredients | Full ingredient list | A short list tells you exactly what you take |
| Price per day | Bottle price divided by the number of days covered | About €0.16 per day for the two examples in this guide |
NRV: nutrient reference value, set by Regulation (EU) No 1169/20111.
What vitamin B12 does in the body
Vitamin B12 is a water-soluble vitamin that the body cannot make. It is involved in red blood cell formation, in the functioning of the nervous system and in DNA synthesis2.
The EU register of health claims3 grants vitamin B12 eight claims. It contributes, in particular:
- to the reduction of tiredness and fatigue;
- to normal energy-yielding metabolism;
- to the normal functioning of the nervous system;
- to normal red blood cell formation;
- to the normal function of the immune system.
These claims describe a normal role of the vitamin, not an extra effect beyond your needs. The National Institutes of Health also state that supplementation does not appear to improve athletic performance or endurance in people whose vitamin B12 status is already sufficient2.
The four forms of vitamin B12
All forms of vitamin B12 are called cobalamins. They differ by the molecule attached to the cobalt, and this form is the one shown in the ingredient list.
| Form | Status in the body | Where you find it |
|---|---|---|
| Methylcobalamin | Active form | Supplements that aim to provide an active form directly |
| Adenosylcobalamin | Active form | Formulas that combine several forms |
| Hydroxocobalamin | Becomes active once converted | Natural storage form, also used in injections |
| Cyanocobalamin | Becomes active once converted | The most common form in supplements |
According to the National Institutes of Health, methylcobalamin and adenosylcobalamin are the metabolically active forms, while hydroxocobalamin and cyanocobalamin become active once converted2. The same fact sheet states that vitamin B12 in supplements is often provided as cyanocobalamin.
What the form changes for you
An active form such as methylcobalamin does not need to be converted. This is the argument put forward by the brands that choose it. Cyanocobalamin, more widespread, remains the standard form of many supplements and fortified foods. If you are unsure which form suits your situation, especially if you have a digestive condition, ask your doctor.
How much vitamin B12 should you choose?
Official reference values are expressed in micrograms (µg), one millionth of a gram.
| Reference | Value | Source |
|---|---|---|
| Nutrient reference value (labels) | 2.5 µg per day | Regulation (EU) No 1169/20111 |
| Adequate intake, adults | 4 µg per day | EFSA, 20154 |
| Adequate intake, pregnancy | 4.5 µg per day | EFSA, 20154 |
| Adequate intake, breastfeeding | 5 µg per day | EFSA, 20154 |
| Tolerable upper intake level | None set | NIH2 |
In 2015, EFSA set an adequate intake of 4 µg of vitamin B12 per day for adults, based on several blood markers of cobalamin status and on mean observed intakes of 4.2 to 8.6 µg per day in several European countries.
Vitamin B12-only supplements are usually the most highly dosed: the NIH note that they contain the highest doses, while multivitamins and B-complex supplements usually contain smaller amounts2. A dose of 1,000 µg per capsule represents 40,000% of the NRV.
Why supplements are so highly dosed
In food, vitamin B12 is bound to protein and must be released by stomach acid, then combine with intrinsic factor to be absorbed. Vitamin B12 added to supplements and fortified foods is already in free form and does not need this first step2. This is one reason why a supplement interests older adults, whose stomach acidity decreases with age. The high doses of supplements take these absorption mechanisms into account, as Nutri&Co explains on its product page.
Capsule, tablet or drops: the format
The format is the physical form of the supplement. It matters for your comfort and for your diet.
- Capsule: the most common format. A hydroxypropyl methylcellulose (HPMC) shell is plant-based, unlike a gelatin capsule.
- Chewable or sublingual tablet: practical if you find capsules hard to swallow.
- Drops: useful to adjust the dose, provided you read the amount of vitamin per drop.
- Injection: only on medical prescription, in particular for some causes of malabsorption.
Vitamin B12 and plant-based diets
Vitamin B12 is found almost only in animal products: meat, fish, eggs, dairy products. The National Institutes of Health list people who follow vegetarian diets among the groups at risk of inadequacy, as well as infants of vegan mothers2.
If you follow a vegan diet, two points matter on the label:
- The format: a plant-based capsule (HPMC) rather than a gelatin capsule.
- The vegan mention: it confirms that no animal-derived ingredient is used in the formula.
The intake rhythm (daily or weekly) depends on the dose chosen and on your diet: agree on it with a doctor or a dietitian. The page on vitamin B12 deficiency details the most exposed profiles and the signs that should alert you.
Two examples of vitamin B12 supplements sold in France
The two supplements below are listed as label-reading examples, in alphabetical order. Both are based on methylcobalamin. The information comes from the brands’ official product pages, as of 10 November 2026.
| Point | Nutri&Co, Vitamin B12 | Novoma, Vitamin B12 |
|---|---|---|
| Form | Methylcobalamin (MecobalActive) | Methylcobalamin |
| Dose per capsule | 1,000 µg | 1,000 µg |
| Intake stated by the brand | 1 capsule per day | 1 capsule per day |
| Capsule | Plant-based (HPMC) | Plant-based (HPMC) |
| Bottle duration | At least 4 months at 1 capsule per day | 120 capsules, 4-month course |
| Bottle price | €19.90 | €19.90 |
| Ideal for | A patented methylcobalamin known for its stability, suitable for vegans and vegetarians according to the brand | A short formula made in France, with the origin and supplier of the vitamin published |
First example: a patented methylcobalamin
Nutri&Co is a French food supplement brand. Its vitamin B12 uses MecobalActive, a patented methylcobalamin that the brand presents as highly bioavailable and stable. Each plant-based capsule provides 1,000 µg of vitamin B12, with acacia gum and rice starch as the only other ingredients. The brand states that it is suitable for vegans and vegetarians, and that a bottle lasts at least four months at one capsule a day.
Second example: a clean formula made in France
Novoma is a brand of food supplements made in France, available in more than 1,300 partner pharmacies according to the brand. Its vitamin B12 contains only methylcobalamin, acacia gum and a plant-based capsule. The 120-capsule bottle covers a four-month course at one capsule a day. The brand publishes the origin and supplier of its vitamin, as well as a downloadable certificate of analysis and product label.
Practical tips before you start
- Have your vitamin B12 measured if you have symptoms or a risk factor: only a blood test confirms a deficiency.
- Mention your treatments to your doctor or pharmacist: according to the NIH, gastric acid inhibitors and metformin may lower vitamin B12 levels2.
- Add up your sources: if you already take a multivitamin or a B-complex, count the vitamin B12 it provides.
- Read the full ingredient list, especially the type of capsule if you follow a plant-based diet.
- Work out the price per day rather than the bottle price: divide the price by the number of days covered.
To place vitamin B12 among other micronutrients, the page on vitamin and mineral needs gives the reference values for each. The guide to micronutrition and diet explains how to cover your needs through food before supplementing, and the food supplements guide details the regulations and mandatory label information.
Frequently asked questions
What is the best vitamin B12 brand?
No brand is the best for everyone: a good vitamin B12 supplement is defined by its form, its dose, its format and its ingredients. On the label, check the form first (methylcobalamin, adenosylcobalamin, hydroxocobalamin or cyanocobalamin), then the amount per serving compared with the 2.5 µg nutrient reference value. As examples, Nutri&Co and Novoma both offer vitamin B12 as methylcobalamin, at 1,000 µg per plant-based capsule, for €19.90 per bottle covering four months at one capsule a day, as of 10 November 2026. Nutri&Co uses the patented methylcobalamin MecobalActive, while Novoma publishes the origin and supplier of its vitamin and manufactures in France. If you suspect a deficiency, a blood test prescribed by a doctor remains the starting point.
Methylcobalamin or cyanocobalamin: which one should you choose?
According to the US National Institutes of Health, methylcobalamin and adenosylcobalamin are the two active forms of vitamin B12 in the body, while hydroxocobalamin and cyanocobalamin become active once converted. Cyanocobalamin is the most common form in supplements. Methylcobalamin is often chosen by brands that want to offer an active form directly.
How much vitamin B12 should you take per day?
In 2015, EFSA set an adequate intake of 4 µg per day for adults, 4.5 µg during pregnancy and 5 µg during breastfeeding. Vitamin B12-only supplements are often dosed far above that, at 1,000 µg per serving. The National Institutes of Health state that no upper intake level has been set for vitamin B12, which is generally considered safe even at high doses. The dose and length of a course should be decided with your doctor, especially if a deficiency has been confirmed.
Should vegans take vitamin B12?
Vitamin B12 is found almost only in animal products. The National Institutes of Health list people who follow vegetarian diets among the groups at risk of inadequacy, as well as infants of vegan mothers. A vegan diet therefore calls for fortified foods or a vitamin B12 supplement: ask your doctor or a dietitian about how often to take it.
Sources
EUR-Lex, Regulation (EU) No 1169/2011 on the provision of food information to consumers, Annex XIII ↑ ↑
NIH, Office of Dietary Supplements, “Vitamin B12: Fact Sheet for Health Professionals” ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑
EUR-Lex, Regulation (EU) No 432/2012 establishing a list of permitted health claims ↑
EFSA, “Scientific Opinion on Dietary Reference Values for cobalamin (vitamin B12)”, EFSA Journal, 2015 ↑ ↑ ↑