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But if people ask me, Would you take it? I would say no, citing worries about the long-term effects on things like tumor growth and whether it can enhance already proven levers like good nutrition, sleep, and rehab

New blood vessel formation could theoretically support tumor growth in those with existing malignancies

Interestingly, a recent study showed that oral supplementation of NR altered the intestinal microbial composition in rats and mice but not humans 63 , highlighting the need for further studies on this matter to assess the impact of NAD + metabolism modulation by the microbiome on health outcomes

Causes of vitamin B12 deficiency