why inject b12 Best Vitamin Injection Sites: Where to B12 · PA Relief Are Vitamin B12 Shots Right
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useful when someone is deficient
A deficiency in B12 can lead to megaloblastic anemia, characterized by larger-than-normal red blood cells that may not function properly

While vitamin B12 is generally considered safe, even at high doses, the concept of "too much vitamin B12" is worth exploring
