Daily How Much

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

Vitamin B12 injection doses usually range from 100 to 1,000 micrograms, set on a schedule your doctor chooses for your needs.

Most fortified nutritional yeast supplies around 4–24 micrograms of vitamin B12 per 2-tablespoon serving, depending on the brand.

Most adults start with 1,000 micrograms of vitamin B12 by injection once a week for 4–6 weeks, adjusted by a doctor for your cause of deficiency.

One cup of plain yogurt usually provides about 1–1.4 micrograms of vitamin B12, close to half of an adult daily target.

One large egg supplies about 0.6 micrograms of vitamin B12, roughly one quarter of an adult’s daily needs.

One cup of cow’s milk usually provides around 1.1–1.4 micrograms of vitamin B12, giving roughly half of an adult’s daily requirement.

Most adult women need about 2.4 micrograms of vitamin B12 a day, with small increases during pregnancy and breastfeeding.

Most adults keep brain health on track with 2.4 micrograms of vitamin B12 per day, though higher intakes may help if levels are low.

There is no single standard B12 dose for schizophrenia; clinicians base vitamin B12 plans on blood tests, diet, and the rest of the treatment plan.