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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

Interestingly, most people are deficient in vitamin B12, especially vegetarians or vegans, and persons with specific diseases

For weight-loss evidence context, review Mayo Clinic information on B12 injections and weight loss

Common formulations include 10mg, 12mg, 15mg, or 20mg per vial

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