One review recommended that those with vitamin B12 deficiency take 1 mg of vitamin B12 daily for a month, followed by a maintenance dose of 125–250 mcg per day (21 Trusted Source).

Dear I.F.: The DV (a replacement for what we used to call the recommended daily allowance, or RDA) for vitamin B12 is 2.4 mcg ...

Medically reviewed by Jonathan Purtell, RDN Vitamin B12 helps your body make red blood cells, produce energy, and keep your ...

Learn about foods high in vitamin B12 that are also vegetarian-friendly. ... 1/4 cup of 100%-fortified nutritional yeast provides 8.3 to 24 mcg of vitamin B12, or 346 to 1,000% of the DV.

Dr. Roach: I am 73, and I was worried about dementia. Turns out, I am “normal.” However, the neurologist told me to take 2,000 mcg of B12 daily. My multivitamin has 100 mcg, which is 4,167% of ...