Vitamin B12: role and supplements

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Vitamin B12, or cobalamin, is a water-soluble B vitamin built around a cobalt atom. It is found mainly in foods of animal origin: offal, fish, seafood, meat, eggs and dairy products.

Discover its recognised benefits, its food sources, its different forms and our selection of food supplements.

Vitamin B12: role and supplements | NATURAMedicatrix

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Discover our top 3 products Vitamin B12

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Active ingredients guide

Vitamin B12: benefits, sources and food supplements

Vitamin B12, or cobalamin, is a water-soluble B vitamin. It is the only vitamin that contains a mineral, cobalt, hence its name. It is made neither by plants nor by animals, but by certain bacteria.

Unlike the other B vitamins, it is stored in significant amounts by the body. To be absorbed, it must bind in the stomach to a protein called intrinsic factor, before being taken up in the small intestine.

2.5 µg per day

The adult reference intake used on European labelling.

Four forms

Cyanocobalamin, methylcobalamin, hydroxocobalamin and adenosylcobalamin.

Animal origin

It is found mainly in foods of animal origin.

Recognised benefits

The recognised benefits of vitamin B12

What is vitamin B12 for? The European Union authorises eight health claims for this vitamin:

Energy

Vitamin B12 contributes to normal energy-yielding metabolism.

Fatigue

Vitamin B12 contributes to the reduction of tiredness and fatigue.

Nervous system

Vitamin B12 contributes to normal functioning of the nervous system.

Psychological function

Vitamin B12 contributes to normal psychological function.

Red blood cells

Vitamin B12 contributes to normal red blood cell formation.

Immune system

Vitamin B12 contributes to the normal function of the immune system.

Homocysteine

Vitamin B12 contributes to normal homocysteine metabolism.

Cell division

Vitamin B12 has a role in the process of cell division.

Food sources

Where is vitamin B12 found in the diet?

The richest sources are offal (liver, kidneys), fish and seafood, such as oysters or mussels. Meat, poultry, eggs and dairy products, including cheese, also provide it.

Vitamin B12 is found mainly in foods of animal origin. People who follow a vegan diet therefore turn to fortified foods or food supplements.

Forms and intake

Methylcobalamin or cyanocobalamin: what is the difference?

Cyanocobalamin is a very stable synthetic form, long the most widely used in supplements. Methylcobalamin and adenosylcobalamin are the two forms the body uses directly as coenzymes. Hydroxocobalamin, found in foods, is also a natural form.

The reference intake (RI) for an adult is 2.5 µg per day. Supplements often show much higher dosages, expressed as a percentage of the RI. Follow the daily dose stated on the label.

Buying guide

Which vitamin B12 food supplement should you choose?

The form

Methylcobalamin, cyanocobalamin: the form is always stated in the list of ingredients.

The dosage

Compare the amount in µg per dose and the percentage of the reference intake.

Alone or combined

Alone in tablets, or with the other B vitamins, notably folate (B9).

The composition

For a vegan diet, also check the origin of the other ingredients.

Our selection

Our vitamin B12 supplements

Here are three formulas that provide a significant amount of it. Find all our products containing vitamin B12 in the list above.

Vitamine B12 activ’ — 60 tablets

500 µg of methylcobalamin per tablet (20,000% of the RI), with a red berry flavour.

Discover Vitamine B12 activ’ →

MecobalActive — 60 tablets

500 µg of methylcobalamin per tablet, with natural cherry flavouring and xylitol.

Discover MecobalActive →

Multivitamines B-Methyl-Homocysteine — 60 capsules

10 µg of methylcobalamin per capsule (400% of the RI), with the other B vitamins, betaine, choline and zinc.

Discover Multivitamines B-Methyl →

Frequently asked questions

Vitamin B12 FAQ

Why is vitamin B12 called cobalamin?

Because its molecule is organised around a cobalt atom. All its forms therefore carry the suffix “cobalamin”.

How should I take a course of vitamin B12?

Follow the daily dose and duration stated on the label of the product you choose. If you take several supplements, add up their vitamin B12 content.

Should vegans take vitamin B12?

Vitamin B12 is found mainly in foods of animal origin. A vegan diet therefore provides very little of it; talk to your doctor or a dietitian.

Where can I buy vitamin B12?

In pharmacies, organic shops or online. At NATURAMedicatrix, vitamin B12 is available on its own, in methylcobalamin tablets, or in B vitamin complexes.

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Vitamin B12: benefits, sources and food supplements

The recognised benefits of vitamin B12

Energy

Fatigue

Nervous system

Psychological function

Red blood cells

Immune system

Homocysteine

Cell division

Where is vitamin B12 found in the diet?

Methylcobalamin or cyanocobalamin: what is the difference?

Which vitamin B12 food supplement should you choose?

The form

The dosage

Alone or combined

The composition

Our vitamin B12 supplements

Vitamine B12 activ’ — 60 tablets

MecobalActive — 60 tablets

Multivitamines B-Methyl-Homocysteine — 60 capsules

Vitamin B12 FAQ

Why is vitamin B12 called cobalamin?

How should I take a course of vitamin B12?

Should vegans take vitamin B12?

Where can I buy vitamin B12?

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