Injecting what? Gear is not going to make you grow specific body parts from site injections. Site injections do not work for growth. Your body overall will grow, but not one muscle group over another just because you inject there!
*A point of interest: Primobolan Depot (like Winstrol Depot) has been noted to
possess excellent site- injection qualities. This means that a lagging body part
became the injection site for dosages. Most who used this type of protocol did so after
training that body part to avoid bruising.
Straight from chemical muscle enhancement