Testosterone Propionate: Chemical Formula C3H6O2
Testosterone propionate is a fast-acting ester with a release time of 3-4 days. To keep blood levels from fluctuating greatly, propionate is usually injected between one to three times a week. Some users also report that propionate is a more painful injection, with swelling and noticeable pain around the injection site. Brand names of testosterone propionate include "Testovis" and "Virormone."
Testosterone Phenylpropionate: Chemical Formula C9H10O2
Testosterone phenylpropionate is a slow-acting ester, with a release time of 1-3 weeks. A popular name brand for T-phenylpropionate is "Testolent." Testosterone phenylpropionate is also one of the components of Sustanon and Omnadren.