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These doses are well tolerated and have no meaningful toxicity risk, as excess B12 is excreted in urine rather than accumulating in tissues
If your B12 levels are already solid, the impact might be minimal
The recommended dietary allowance (RDA) for vitamin B12 for people Note that the percent of vitamin B12 your body can absorb from supplements is not very high its estimated that your body only absorbs 10 mcg of a 500 mcg B12 supplement
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doi:10.1002/14651858.CD004655.pub3
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