does b12 injection leave body in 24 hours Best Vitamin Site: Administering B12 Shots How Often Can I Take
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Quickly withdraw the needle and immediately put it into the sharps container

Diet 30 (3), 247259

The same study found injection absorption rates were about 55 to 97 percent

While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says
