How to self administer subcutaneous B12 injection. 1. Withdraw proper VItamin B12 TikTok Post surgery brain fog? Its real and B12 might be your secret weapon. , , After anesthesia, its common to feel a little offlow energy, foggy focus, sluggish recovery. A quick B12 injection can When I first got the B12 shot, I was really surprised what a difference it made in my energy levels. And thats exactly what happens if youre deficient in this essential vitamin. , B12 is involved in How to Give B12 Injections at Home to Yourself PA Relief