do vit b12 injections have side effects What are the benefits of injection? Understanding the B12 Vitamin Shot:

It also helps promote cellular repair and modulate neurochemical imbalances, making it a potential complement to substance abuse recovery programs

The Shoulder If someone is giving you a B12 injection in the shoulder, have them make a downward-facing v-shape with your thumb and forefinger over the deltoid (shoulder) muscle

J Bacteriol 180, 67196728 (1998)

Subacromial Bursa The subacromial bursa, located near the shoulder joint, also falls under CPT 20610

Thus, the impact of B12 supplementation on skeletal muscle mitochondrial biology was examined in (i) aged female mice, given 12 weeks of B12 supplementation (SUPP) or vehicle control, and (ii) in human primary myotubes

doi: 10.1038/s41598-021-92945-y