HOW MANY MG OF VITAMIN B12 IS RECOMMENDED DAILY
The recommended dietary allowances (RDAs) of vitamin B12 are: Infants 0-6 months, 0.4 mcg; infants 7-12 months, 0.5 mcg; children 1-3 years, 0.9 mcg; children 4-8 years, 1.2 mcg; children 9-13 years, 1.8 mcg; older children and adults, 2.4 mcg; pregnant women, 2.6 mcg; and breast-feeding women, 2.8 mcg. Unlike some vitamins, vitamin B12 is measured in micrograms, not milligrams. A micrograms is a thousandth of a milligram, so 500 mg of vitamin B12 is 500,000 micrograms; the recommended daily intake is between 2 and 2.8 micrograms. For canker sores, sublingual (under the tongue) vitamin B12 has been given daily for six months. For claudication, a total daily dose of 1.5 milligrams of vitamin B12 was taken by mouth in divided doses of 0.5 miligrams three times daily for six months. For vitamin B12 deficiency, 125-2,000 micrograms of cyanocobalamin has been taken by mouth daily for up to 2.5 years or longer. Five hundred micrograms of sublingual (under the tongue) vitamin B12 has been used daily for up to four weeks. The Institute of Medicine's Food and Nutrition Board recommends that healthy adult men and women over 19 years old consume 2.4 micrograms of vitamin B-12 each day. Pregnant women need 2.6 micrograms daily and women who are breastfeeding need 2.8 micrograms daily. The RDAs and AI levels of vitamin B12 are as follows: for infants 0-6 months old, 0.4 micrograms (AI); for infants 7-12 months old, 0.5 micrograms (AI); for children 1-3 years old, 0.9 micrograms; for children 4-8 years old, 1.2 micrograms; and for children 9-13 years old, 1.8 micrograms. A micrograms is a thousandth of a milligram, so 500 mg of vitamin B12 is 500,000 micrograms; the recommended daily intake is between 2 and 2.8 micrograms. A micrograms is a thousandth of a milligram, so 500 mg of vitamin B12 is 500,000 micrograms; the recommended daily intake is between 2 and 2.8 micrograms. The body uses vitamin B12, along with the B-complex vitamin folate, to help produce DNA. For claudication, a total daily dose of 1.5 milligrams of vitamin B12 was taken by mouth in divided doses of 0.5 miligrams three times daily for six months. 1 For vitamin B12 deficiency or pernicious anemia: cyanocobalamin doses of 300-10,000 mcg (microgram) daily have been used. 2  However, some evidence suggests that the most effective oral dose is between 647-1032 mcg/day.
Infants 0-6 months, 0.4 mcg; infants 7-12 months, 0.5 mcg; children 1-3 years, 0.9 mcg; children 4-8 years, 1.2 mcg; children 9-13 years, 1.8 mcg; older children and adults, 2.4 mcg; pregnant women, 2.6 mcg; and breast-feeding women, 2.8 mcg.