Propha-testosterone 100mg/10 ml is an injection containing the testosterone ester proprionate. This is a fast acting form of testosterone, meaning that the effects can be felt quickly and peak in the body in about 48 hours. The effects of this form of testosterone will typically last for around 2-3 weeks. It is primarily used to help treat a testosterone deficiency, as it can be both effectively and quickly absorbed by the body. It can also be used by bodybuilders to increase muscle size and strength as well as decrease body fat.