b12 injection side effects pregnancy How Quickly Does Shot Work? Does It Help to Lose Weight? B12 deficiency and injections during

Taking B12 before and after a bout of heavy drinking seems to be the most beneficial

Week four is often a checkpoint

McTiernan CF, Morel P, Cooper LT, Rajagopalan N, Thohan V, Zucker M, et al

In rare cases, some people might have severe side effects like: Skin rash, itching, or hives Swelling of the face, lips, or tongue Chest pain or tightness Blue tint to the skin Difficulty breathing or wheezing A swollen, painful area on the leg Dizziness If you experience any of the above side effects, reach out to a healthcare provider immediately

Rapid protocols, slow protocols, single- and multi-component protocols, and others are known [109,110,111,112]