ANSWER: The DV (a replacement for what we used to call the recommended daily allowance, or RDA) for vitamin B12 is 2.4 mcg. (There are 1,000 micrograms in a milligram, so 2.4 mcg is a very small ...

VITAMIN B12 is essential for the production of red blood cells and in keeping the nervous system healthy, but a lack of the vitamin could lead to vitamin B12 deficiency anaemia.

DEAR DOCTOR: I'm almost 90 years old and always tired. I took two capsules of 2,000 mcg vitamin B12 the other night, and felt stronger and not as tired. Is ...

Several signs of toxicity can occur when a person exceeds the recommended dosage of Vitamin B12. Vitamin B12 is essential for the nervous system to function as normal and some people may take ...

Medically reviewed by Sohaib Imtiaz, MD Key TakeawaysTake vitamin B12 on an empty stomach in the morning or early afternoon to maximize absorption and avoid sleep disruptions.Vegans, older adults, and ...

Experts explain how to tell if you may be deficient in vitamin B12 and whether you may benefit from a supplement. Plus, high-quality options if you need one.