Trenbolone also has a very strong binding affinity to the androgen receptor (A.R), binding much more strongly than testosterone. This is important, because the stronger a steroid binds to the androgen receptor the better that steroid works at activating A.R dependent mechanisms of muscle growth. There is also strong supporting evidence that compounds which bind very tightly to the androgen receptor also aid in fat loss. Masteron is a powerful anabolic/androgenic steroid derived from DHT that was designed to fight certain forms of breast cancer. It is used by bodybuilders as a bulking and cutting agent, as well as an ancillary drug to combat estrogenic side effects like water-retention. Its toxicity to the liver is very low, although side effects such as acne, hair loss and prostrate enlargement are common. Testosterone Phenylpropionate is A short ester attached to the Testosterone hormone. This means it takes your body the least amount of time to rid itself of the ester and release the parent hormone into the body. Due to its short active life, Testosterone Phenylpropionate typically needs to be injected every other day at a minimum. Anecdotally, Testosterone Phenylpropionate causes the least side effects and the least bloating; these side effects usually subside very quickly when use is ceased.