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Youre over 60 years old and can benefit from B12 supplementation

The mice had the peptide administered to them through drinking water

Two things matter here

Second, medications that many older people take, like metformin for diabetes or proton-pump inhibitors for acid reflux, can also impact absorption. Are vegan or strictly vegetarian: Because most dietary intake of B12 comes from animal products, B12 supplements are recommended for people who eat a vegan diet or a vegetarian one with few eggs and dairy products

[DOI] [PMC free article] [PubMed] [Google Scholar] 32.Brundu S., Palma L., Picceri G.G., Ligi D., Orlandi C., Galluzzi L., Chiarantini L., Casabianca A., Schiavano G.F., Santi M., et al