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Fast Facts Buying B12 injections online is safe as long as you have a prescription from a licensed medical provider and get the injections from a reputable pharmacy

Oral B12 vitamins rely on your stomachs acidity and intrinsic factor for absorption, which can be variableespecially if you have gut issues or take acid-blocking medications

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If your B12 is really low, it might take a few more days before the tiredness fades away

Weight loss surgery patients in particular, are at increased risk of developing vitamin B12 deficiency because their digestive tracts have been altered in such a way as to interfere with the natural absorption of this vitamin