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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.

Most adults need about 2.4 mcg of vitamin B12 per day to keep hair growth and overall health on track.

Most adults with neuropathy receive 500 to 1,500 micrograms of vitamin B12 daily or several times weekly, guided by blood tests and medical care.

Most adult women need 2.4 mcg of vitamin B12 a day, rising to 2.6 mcg in pregnancy and 2.8 mcg while breastfeeding.

Most vegetarian adults need about 2.4 micrograms of vitamin B12 per day, with slightly higher targets during pregnancy and breastfeeding.

Most vegan adults need about 2.4 micrograms of vitamin B12 per day, with higher targets during pregnancy and breastfeeding.