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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

For anti-aging support at the cellular level

Blood 1994

Unit size: 50 mg per vial

No toxic or lethal dose was achieved across a remarkably wide range of doses from 0.006 mg/kg to 20 mg/kg