Daily How Much

Most adults with hypothyroidism take 2.4 mcg of vitamin B12 daily unless tests show deficiency that needs higher, doctor guided doses.

Most adults with neuropathy use 1,000–2,000 micrograms of vitamin B12 daily, but high-dose plans need approval from a clinician.

For most adults, daily vitamin B12 for energy ranges from 2.4 micrograms in food to around 50–250 micrograms from supplements.

For most healthy adults, a safe daily vitamin B12 dose is around 2 to 4 micrograms from food and supplements combined.

Most women over 50 do well with 2.4 micrograms of vitamin B12 a day, or 500–1,000 micrograms weekly if using high-dose supplements.

Most adults need about 2.4 micrograms of vitamin B12 each day, with slightly higher amounts during pregnancy or breastfeeding.

Daily vitamin B12 intake for most healthy adults is around 2.4 micrograms from food and supplements combined.

Most adult women need about 2.4 micrograms of vitamin B12 a day, rising to around 2.6–2.8 micrograms during pregnancy and breastfeeding.

Most healthy vegans do well with a vitamin B12 supplement of 25–100 mcg daily or 1000–2000 mcg once or twice a week from a reliable product.

Most older women do well with about 2.4 micrograms of vitamin B12 a day, often from a mix of food and a small daily supplement.