Test C, also known as Testosterone Cypionate, is a form of synthetic testosterone commonly used in hormone replacement therapy. It is administered as an injection, typically on a weekly or biweekly basis, and acts as a replacement for the testosterone that is naturally produced by the body. This hormone is essential for maintaining normal male sexual development, as well as bone density, muscle mass, and red blood cell production. Test C is particularly useful for individuals experiencing hypogonadism, a condition where the body is unable to produce sufficient amounts of testosterone, as it can help alleviate the associated symptoms, such as reduced libido, fatigue, and cognitive impairment. However, it should only be used under the supervision of a qualified healthcare professional.