Daily How Much

Most healthy adults need about 5 mg of vitamin B5 per day, while needs range from 1.7–7 mg across infancy, childhood, pregnancy, and breastfeeding.

Most adults need 14–16 mg of vitamin B3 from food each day, with higher targets set for pregnancy and lactation.

Most adults should keep vitamin B3 from supplements at or below 35 mg a day, unless a doctor prescribes a higher monitored dose.

Most adults need about 1.1–1.3 mg of vitamin B2 daily, with higher amounts during pregnancy and breastfeeding.

High-dose vitamin B2 for migraine prevention usually means 400 mg daily, under medical guidance, for at least three months.

Most adults with shingles-related nerve pain use vitamin B12 doses between 250–1,000 mcg daily or injection plans set by a doctor.

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.