Testosterone propionate is an oil based steroid with an propionate ester which will cause the steroid to be released from the injection site over the duration of a few days. This is different then the likes of testosterone enanthate which is much more slow acting compared to the propionate ester, which requires much more frequent injections to make sure blood concentrations remain stable. Injections every day, or every other day is the normal practice with testosterone propionate. The greater volume of injections needed when using testosterone propionate is not likeable for some users, either because of their circumstances, or because of the build up of scar tissue and therefore the need for more injection sites to rotate to avoid scar tissue build up. Testosterone propionate can be also a sore shot, and result in fever like symptoms for a couple of days. Some UG labs have starting producing 200mg/ml which has brought about some users experiencing very painful shots. Propionate is less soluble and therefore greater amounts of alcohol content will be present in the higher concentrations. Some users have found it more tolerable to mix the shot with another compound to dilute the mixture, and hopefully minimise the pain.
Testosterone Propionate, when administered in the body, is partially converted to both estrogen as well as Di-hydrotestosterone. These are often the cause of many side effects such as gynocomastia, water retention, hair loss and prostate enlargement. Also, as with most steroids, injected testosterone propionate will inhibit natural testosterone levels and HPTA (Hypothalamic Pituitary Testicular Axis). The advantage with testosterone propionate, in this respect, is that it will clear your system more quickly than other esters, and allow you to begin recovery more rapidly. If there is a predisposition and very high dosages are taken, the known androgenic-linked side effects such as acne vulgaris, accelerated hair loss, and increased growth of body hair and deep voice can occur. The toxic influence on the liver is minimal so that a liver damage is unlikely compared to enanthate esters. An increased libido is common both in men and women with the use of propionate. Testosterone propionate is a more painful injection, pronounced soreness and low-grade fever that may last for a few days, with swelling and noticeable pain around the injection site .