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However, studies assessing bioavailability of B12 from specific food sources in healthy participants have shown that absorption varies depending on both the specific food product and the magnitude of the dose, ranging from 36%24% for egg products (dose 0.30.94mg, respectively), 83%52% for lean meat (dose 0.545.11mg, respectively), 42%30% for fish (dose 2.113.1mg, respectively) and 49%4.5% for liver products (dose 0.538mg, respectively) (Doets et al., 2013)

High-dose vitamin B12 injections can cause immunologically induced skin reactions, which is why an amount adjusted to the individual blood level is recommended for supplementation among vegans to avoid possible vitamin B12 side effects

Vitamin B12 supplements Cobalamin compounds such as cyanocobalamin and hydroxycobalamin are commonly given as supplements

Food sources include animal products like meat, fish, and eggs

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Only specific peptides, like semaglutide, are FDA-approved for weight loss and available through standard prescriptions