vitamin b12 injection in thigh Sites: All You Need to Know b12 injection sites b12 injection
Description
doi:10.1034/j.1600-0447.2003.00089.x 29

The limitation is penetration
In these situations, oral B12 supplements are often useless because the digestive system can't properly absorb the nutrient

Management of Anemia in Young Livestock
Schmittgen, T

Finer than 27 gauge should not be used, because of the danger of it breaking whilst in your flesh
