Androgens, anabolic steroids are synthetically modified form of the hormone testosterone. They vzaymstvat its structure and functions in the body, so I will look through the prism of our primary androgen testosterone. It exists in two forms, free and bound state. Testosterone is produced by the testes in size from 3 to 10 mg daily and adrenaline glands that produce the hormone dehydroepiandrosterone (DHEA), which by connecting with the appropriate enzyme becomes androstenedione, which in turn has the ability to transform into testosterone or estrogen . Once you enter the plasma testosterone exists in two forms - associated and free. 45% of it is related to a range sex binding globulin, other 53% albumin and only 2% are in free form. In women, it is even less, 1%. It is the free testosterone, which is important for sporting purposes. Transmitted through blood, free testosterone through androgen properties, binds to androgen receptors in the body - muscle cells, hair follicles, prostate, central nervous system, etc.. Coupled with the muscle cells of the testosterone molecule forms a receptor complex. This receptor complex is transported to the nucleus, where it will connect with a specific part of the DNA of the cell responsible for hormone absorption. This activates specific genes responsible for the synthesis of proteins and myosin actone - where achieving muscle hypertrophy. It also increases the level of muscle glycogen - hence increase power efficiency