Vitamin B12 injections are used to treat low B12 levels when diet or tablets are not enough
Pedro Ferreira J, Pitt B, Zannad F
A single-center, double-blinded, randomized controlled study to evaluate the relative efficacy of sublingual and oral vitamin B-complex administration
Those experiencing fatigue, low energy, or mood swings
Here are the best vitamin B12 injection sites for each method: Subcutaneous B12 injection sites Usually, the best places to give yourself a B12 shot subcutaneously are the abdomen, thigh, and upper arm, as you can see in this illustration: Although not shown above, the buttock is another good site for B12 shots
Shaking can cause the delicate peptide chains to break apart or denature, which may render the compound ineffective