Daily How Much

One healthy adult usually needs about 2.4 micrograms of vitamin B12 a day, with higher B12 recommendations during pregnancy and breastfeeding.

Most standard vitamin B12 injections contain 1,000 micrograms of B12 per dose, though some shots deliver 100 to 500 micrograms instead.

Each Metanx capsule contains 2 mg of methylcobalamin vitamin B12, and most adults take two capsules daily under medical supervision.

One large egg usually contains about 0.5 micrograms of vitamin B12, giving roughly one fifth of an adult’s daily need.

Most healthy adults can safely take up to 1,000–2,000 mcg of vitamin B12 daily, though many only need small doses to meet their needs.

Most adults use 25–1,000 mcg of B12 methylcobalamin daily, while official guidelines still base needs on about 2–4 mcg of vitamin B12 per day.

For most healthy adults, daily vitamin B12 intake up to 1,000 micrograms from supplements appears safe, while higher doses need medical supervision.

For most healthy adults, daily vitamin B12 above about 1,000 mcg is usually unnecessary and should only be used long term under medical guidance.

For healthy adults, daily vitamin B12 intake around 2.4–4 micrograms is enough, and even much higher doses are usually safe for most people.

Most adults with neuropathy need 1,000–2,000 mcg of vitamin B12 daily at first, then 250–1,000 mcg long term, guided by blood tests and symptoms.