Possible Side Effects Vitamin B12 injections are generally safe, but minor side effects may occur
further notes that a restricted maintenance dose of just four injections per year is what is normally allowed, which can leave people physically and mentally unable to contribute to either family or society, and lead to permanent neurological damage
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Lu H, et al
However, for self-injection we recommend the area around the belly button
We included products with various B12 levels that work for different dosage needs, as well as vegans, vegetarians, and those with allergies