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For U.S. food and dietary supplement labeling purposes, the amount in a serving is expressed as a "percent of daily value" (%DV). For vitamin B 12 labeling purposes, 100% of the daily value was 6.0 μg, but on 27 May 2016, it was revised downward to 2.4 μg (see Reference Daily Intake).
Registered dietitians explain what vitamin B12 is, how much you need, and the potential side effects of taking too much. Skip to main content. 24/7 Help. For premium support please call: ...
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The Recommended Dietary Allowance (RDA) for vitamin B12 is 0.9-2.4 μg/day, while the estimated average requirement in the U.S. and Canada is 0.7-2 μg/day. Elderly individuals with plasma vitamin B12 levels below 148 pmol/L are considered severely deficient, and those with levels between 148 and 221 pmol/L are marginally deficient.
The Good Housekeeping Institute tested more than 30 brands of B12 supplements, and chose Nature made B12 1000mcg as the best overall option, and Garden of Life Vitamin Code Raw B12 as the best ...
The total amount of vitamin B 12 stored in the body is between two and five milligrams in adults. Approximately 50% is stored in the liver , but approximately 0.1% is lost each day, due to secretions into the gut – not all of the vitamin in the gut is reabsorbed.
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