vit b12 injection sites Best Vitamin Best Vitamin B12 Injection Site:
Description
These are posited to act as the main regulatory cells of the hair follicle because they may regulate hair growth and cycling

Metformin (long-term) : Associated with B12 malabsorption code E53.8 or use drug-induced nutritional deficiency coding

Food and Drug Administration, 2023

The most commonly reported side effect is irritation of the area where the injection is administered. If this occurs, consider changing placement on the body or use injections less often

Look for cyanocobalamin, a synthetic form of Vitamin B12 used in most injections, which is efficacious and stable