This is a list of androgens/anabolic steroids (AAS) or testosterone derivatives. Esters are mostly not included in this list; for esters, see here instead. The major classes of testosterone derivatives include the following (as well as combinations thereof): The last group consists of progestins with mostly only very weak androgenic/anabolic activity. AAS that are listed as marketed may be marketed as one or more esters rather than as the listed AAS itself.