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The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements
N Engl J Med
This allows the body to gradually readjust appetite regulation systems
Foods that are naturally rich in vitamin B12 include meat, poultry, fish, and dairy products
Vitamins fall into two groups: fat-soluble and water-soluble, and this distinction is central to B12's safety profile
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