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The blood cells dont develop properly, and are unable to move into the bloodstream at the correct rate

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Mayo Clinic - Vitamin B12 deficiency anemia National Institutes of Health (NIH) - Vitamin B12 Fact Sheet for Health Professionals Harvard Health Publishing - Vitamin B12 deficiency: What to know NHS (National Health Service) - Vitamin B12 or folate deficiency anemia American Academy of Family Physicians - Diagnosis and Treatment of Vitamin B12 Deficiency

Associated with elevated NAD+ levels and SIRT1 activation in preclinical studies