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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 product may contain aluminum, which can infrequently build up to dangerous levels in the body

The treatments were done in a very timely manner

Both methods can effectively raise your vitamin B12 levels, but they work differently