Vitamin B12 and B-Complex

B12 alone or a B-complex: how they compare

Vitamin B12: methylcobalamin or cyanocobalamin

Compounds with vitamin B12 activity are called cobalamins because they contain cobalt. The NIH Office of Dietary Supplements explains that methylcobalamin and 5-deoxyadenosylcobalamin are the metabolically active forms, while cyanocobalamin and hydroxocobalamin become active once the body converts them. Both methylcobalamin and cyanocobalamin are in our range.

Lozenges dissolve in the mouth; tablets are swallowed. Some B12 products add folic acid, which then has its own line on the label (folic acid NRV: 200 µg).

B-complex: several B vitamins in one

A B-complex combines B vitamins in one product. The EU reference values from Regulation (EU) No 1169/2011 are:

Compare the % column on the label rather than the milligrams, because the NRVs differ so much from one vitamin to the next. If you also take a multivitamin or a biotin product, add up the B vitamins from all of them.

EU health claims for vitamin B12

Regulation (EU) No 432/2012 permits these statements for products that provide at least 15% of the NRV per daily dose:

• Vitamin B12 contributes to normal energy-yielding metabolism.
• Vitamin B12 contributes to normal functioning of the nervous system.
• Vitamin B12 contributes to the reduction of tiredness and fatigue.

Each of the other B vitamins has its own list of permitted claims, shown on the product pages.

Price per day and pack size

B12 tablets are usually one a day, while some B-complex products need two capsules for the full daily dose. We work out the price per day from the daily dose on the label, so two packs at the same price can cost quite different amounts per day. Check the number of tablets or capsules in the daily dose before you compare.

Questions

Is 1000 µg of B12 too much?

1000 µg is 400 times the NRV. The NIH Office of Dietary Supplements explains that only a small part of a large oral dose is absorbed: in healthy people, about 10 µg of a 500 µg supplement. That is why B12 products carry doses far above the NRV. Stay within the daily dose stated on the label.

When should I take B vitamins?

B vitamins dissolve in water, so they do not need a fatty meal. Follow the time of day on the label if it gives one. If it does not, take the dose at the same time every day, for example with breakfast, so it becomes a habit.

Do I need B12 alone or a B-complex?

See the table at the top of this guide. A B12 product gives one vitamin in a higher dose; a B-complex covers several B vitamins in one capsule or tablet. Compare the % NRV for the vitamins you are interested in.

Why do vegetarians and vegans look for B12?

Vitamin B12 occurs naturally in foods of animal origin, such as meat, fish, eggs and dairy. If you avoid them, check that the product itself is marked vegan, because tablet coatings and capsule shells can contain animal-derived ingredients.

How do I see which B12 form a product uses?

The label names it in brackets after vitamin B12, for example vitamin B12 (methylcobalamin).

Can I take B12 and a B-complex together?

A B-complex already contains B12, so add the B12 from both products and stay within the daily doses on each label.

Sources

• Regulation (EU) No 1169/2011, Annex XIII (reference intakes)
• Regulation (EU) No 432/2012 (permitted health claims)
• NIH Office of Dietary Supplements: Vitamin B12 fact sheet
• EFSA: Health claims

Content reviewed by Inese Kalniņa, dietitian.

2026-09-29