how long do the b12 injections last for Are Shots Safe? Royal Palm Beach Medical Group The Truth About B12 Injections:
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doi: 10.1016/S0021-9258(18)76074-2 3

Within 48 hours after injection of 100 or 1000 mcg of vitamin B12, 50 to 98% of the injected dose may appear in the urine

But for vegans, supplements are a must to avoid deficiency. Malabsorption-Related Deficiency Protocols Malabsorption-related B12 deficiency needs a special treatment

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Store B12 tablets in a cool, dry place to preserve potency
