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Therefore, NNMT can predict chemotherapy efficacy and represents a potential antitumor target

This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation

Now, the Astrovenneca vaccine has been halted in some European countries because a blood clot issues
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Timing relative to exercise also matters
