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Muscle function and recovery appear to be enhanced, at least in aged mice

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What the Authoritative Sources Say About B12 Deficiency and Supplementation The National Institutes of Health Office of Dietary Supplements publishes the most thorough citation-backed overview of vitamin B12 its role in red blood cell formation and neurological function, the populations most at risk for deficiency (older adults, people on long-term metformin or proton pump inhibitors, vegetarians and vegans, people who have had gastric bypass surgery), and the recommended daily intake at each life stage

Six clinical trials involving over 900 participants established this window through systematic dose-finding studies

B12 deficiency can cause red blood cells to improperly develop