extreme fatigue after b12 injection Shots Side Effects And How To Treat Them Vitamin B12 Injection | Causes

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Gastrointestinal disorders including Crohn's disease, coeliac disease, and previous gastric or ileal surgery can severely compromise B12 absorption

In other cases, if your B level is normal and youre just low in the other Bs, your provider might intentionally choose a B-Complex without B to avoid unnecessary injections

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Daily injections of Vitamin B 12 given IM (into the muscle) and weekly oral dosing of Red Cell iron supplement or injectable iron for a minimum of two weeks are important supportive therapies