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That is the evidence gap, stated plainly: the mechanism is well-motivated and the preclinical signal is consistent, but no human study has confirmed that any of it translates to people, at any dose, by any route
Safety Profile and Possible Side Effects of B12 Shots B12 injections are generally regarded as very safe
Symptoms (fatigue, weakness), physical exam notes, and lab test results such as CBC and ferritin levels
Those who follow a vegetarian diet also have vitamin B12 deficiency
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