Most adults with vitamin B12 deficiency take 1000 mcg daily at first, then step down to a long-term maintenance dose set with their doctor.

The right vitamin B12 dose depends on your age, diet, health conditions, and whether you already have low levels.

Many adults use 500–1,000 mcg of vitamin B12 daily with other B vitamins to help lower homocysteine, guided by blood tests and medical advice.

Most healthy adults need about 2.4 micrograms of vitamin B12 each day, while supplement doses rise when diet or absorption fall short.

Most healthy adults need around 2.4 micrograms of vitamin B12 each day, with slightly higher amounts during pregnancy and breastfeeding.

Most healthy adults start around 2.4 mcg of vitamin B12 per day, but your supplement dose depends on age, diet, and how well you absorb it.

Most healthy adults need about 2.4 micrograms of vitamin B12 per day, with slightly higher amounts in pregnancy and breastfeeding.

Most adults who want weight loss results only need enough vitamin B12 to correct any deficiency, close to standard daily requirements.

Most women over 50 do well with around 2.4 micrograms of vitamin B12 each single day from food, fortified products, or supplements.

Most healthy adults do well with about 2.4 micrograms of vitamin B12 per day from food, supplements, or a mix of both.