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Side Effects: Cyanocobalamin is generally well-tolerated, but some patients might experience side effects, including
British Journal of Nutrition, 2018
Because B12 is water-soluble, the NIH Office of Dietary Supplements notes that no tolerable upper intake level has been established excess B12 is excreted by the body rather than accumulating to toxic levels
Linus Pauling
B-12 Deficiency and GI Symptoms February 15, 2022 Top Picks for vitamin B-12 and other B vitamin supplements
Gastrointestinal absorption of vitamin B 12 depends on the presence of sufficient intrinsic factor and calcium ions
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