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The NIH Office of Dietary Supplements and the American Academy of Family Physicians identify the following groups as most vulnerable: Adults over 50 Age-related decline in stomach acid production reduces the ability to release B12 from food proteins
Evidence for non-injectable routes is limited at best
International travel may require additional documentation and research into local regulations regarding traveling with injectable medications
GLP-1 medications such as semaglutide work primarily by suppressing appetite
Cyanocobalamin can lead to optic nerve damage and possibly blindness in people with Lebers disease
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