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B vitamins / B12 / B-complex
Also called: cobalamin, methylcobalamin, cyanocobalamin, b12
A group of vitamins the body uses to turn food into energy; B12 also keeps nerves and blood cells healthy.
- Why people take it
- Energy, nerves and B12 deficiency.
- What the evidence says
- B12 supplements are important for vegetarians and vegans, older adults and people on metformin or acid-reducing medicines, who often run low. Extra B vitamins do not boost energy if you are not deficient.
- Be careful
- B12 is generally safe. High doses of vitamin B6 over a long time can damage nerves.
- In food
- B12: milk, curd, paneer, eggs, meat, fish. Other B vitamins: whole grains, dals, leafy greens.
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Common questions
What is B vitamins / B12 / B-complex?
A group of vitamins the body uses to turn food into energy; B12 also keeps nerves and blood cells healthy.
Why do people take B vitamins / B12 / B-complex?
Energy, nerves and B12 deficiency.
Does B vitamins / B12 / B-complex work?
B12 supplements are important for vegetarians and vegans, older adults and people on metformin or acid-reducing medicines, who often run low. Extra B vitamins do not boost energy if you are not deficient.
Is B vitamins / B12 / B-complex safe?
B12 is generally safe. High doses of vitamin B6 over a long time can damage nerves.
Sources and further reading
Last reviewed 31 October 2026. Written by Satya Babu.
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