why do gastic bypass patients need b12 injections Vitamin B12: What You to Know: Central California Surgery: Bariatric Surgeons Gastric bypass surgery | Bupa

Vitamin B12 is known as cobalamin

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In many other areas, oral substitution at a sufficiently high dosage has already proven to be equivalent to injections and an improvement of neurological symptoms seems to be equally possible through oral administration (45, 46)

The B12 in your compounded formulation should keep serum B12 levels adequate in most cases, but "most cases" is not "all cases." Verify with bloodwork rather than assuming