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Excessive consumption of alcohol
SubQ (abdomen, thigh) and IM (deltoid, gluteal) are practical for self-administered research protocols, with comparable cellular uptake albeit slower onset
Vegans and Vegetarians: Since B12 is almost exclusively in animal products, those on plant-based diets are at high risk
User 15 calculated a 3-month protocol and recommended a 1-month break before repeating
Benefits and Bioavailability of Vitamin B Complex Injections Vitamin B complex injections, which can include cobalamin and vitamin B12, are quick, effective, and painless injections done in the arm but can also be given in other areas of the body to help treat pernicious anemia
