Testosterone propionate (TP) is a fast-acting androgen and anabolic steroid used to treat low testosterone, often requiring injections every two to three days. It promotes muscle growth, treats breast cancer, and is also used in veterinary applications. It was first approved in 1974 and is known as a short-acting ester. 

• Availability: While widely used in medicine historically, some forms are now used more commonly in veterinary applications. 

• Uses: Primarily for hormone replacement therapy in males (hypogonadism) and sometimes for breast cancer in women.

• Administration: Intramuscular injection, typically every 2-3 days due to a short half-life of roughly 0.8 days (20 hours).

• Characteristics: It is a fast-acting compound compared to longer esters like enanthate or cypionate

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