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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
This is especially important for people with digestive issues who may not be able to absorb oral supplements well at all
They have no major side effects
Increased energy, better focus, improved mood, and more restful sleep are common signs
[2] Age and overall health status also play important roles
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