![]() Check the Supplement Facts label to see how much vitamin B12 a supplement contains.Ī prescription form of vitamin B12 can be given as a shot. Some provide doses of vitamin B12 that are much higher than recommended amounts, such as 500 mcg or 1,000 mcg, but your body absorbs only a small percentage of it. The amount of vitamin B12 in supplements varies widely. Research has not shown that any form of supplemental vitamin B12 is better than the others. Vitamin B12 is also available in a form that’s dissolved under your tongue (called sublingual vitamin B12). Other common forms are adenosylcobalamin, methylcobalamin, and hydroxycobalamin. It is usually in a form called cyanocobalamin. Vitamin B12 is available in multivitamin/multimineral supplements, in B-complex supplements, and in supplements containing only vitamin B12. What kinds of vitamin B12 dietary supplements are available? Manufacturers are not required to list vitamin B12 on the label if a food naturally contains this vitamin. To find out if a food has added vitamin B12, check the Nutrition Facts label.
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