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How much vitamin B12 should you take if you already have a deficiency?

Vitamin B12 is safe even at high doses, and there is no known limit for safe consumption, according to WebMD. The recommended daily allowance of vitamin B12 for people age 14 and older is 2.4 micrograms a day. People over age 50 are more likely to be deficient in vitamin B12, causing fatigue, memory loss and weakness.


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