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can b12 injections cause black stools Vitamin Side Effects Should You Worry About Black
Description
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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Is a B12 injection better than oral supplements
Injections of micronutrient B12 at larger doses may be necessary for older persons to keep their vitamin levels appropriate
No multi-center RCT

High doses of vitamin B-12, to treat a deficiency, may cause side effects such as: Headache