2. For deficiency, 1,000–2,000 mcg daily is required. On the other hand, 250–500 mcg daily is good for maintenance. Higher doses may be needed for severe vitamin B12 deficiency. 3. Sublingual ...

Pregnant women need 2.6 mcg of vitamin B12 a day and breastfeeding women need 2.8 mcg. Most people are able to get enough vitamin B12 from their diets, Allen says, so widespread supplementation ...

2.8 mcg per day For those who are deficient, doctors may recommend higher doses through supplements or injections. Vitamin B12 is produced by certain microorganisms, that live in the gut ...