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A typical B12 injection plan for deficiency starts with 1000 mcg often given repeatedly, then shifts to monthly or three-monthly maintenance.

Most pregnant adults do well with about 1.9 mg of vitamin B6 per day from food and supplements combined.

Most pregnant adults can safely take 10–25 mg of vitamin B6 a day, with a maximum of 100 mg from food and supplements unless a clinician advises otherwise.

Most adults should keep daily vitamin B6 from supplements at or below 100 mg unless a doctor advises otherwise.

Most adults cover vitamin B6 and B12 needs with about 1.3 mg of B6 and 2.4 micrograms of B12 from food and low-dose supplements each day.

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.