SARMs S4 represent the start of a new generation in muscle growth. This product is the first of a new class of designer androgenic/anabolic steroid compounds called SARMs (Selective Androgen Receptor Modulators). Selective Androgen Receptor Modulators (SARMs) provide the benefits of traditional anabolic/androgenic steroids such as testosterone (including increased muscle mass, fat loss, and bone density), while having a lower tendency to produce the unwanted side effects of steroids. With the introduction of SARMs, the bodybuilding community has a new class of compounds that is capable of surpassing the effectiveness of testosterone in producing muscle, due to the potent and selective actions specifically engineered.

S-4 is a Selective Androgen Receptor Modulator. S-4 is a compound (not an anabolic steroid) which has the ability to stimulate the androgen receptor the same way as anabolic steroids. S-4 is an orally active selective agonist for androgen receptors which was shown to have anabolic effects in muscle and bone tissue. SARMs are absorbed orally, but are not liver toxic like most oral steroids are. SARMs anabolic effect has been measured to be roughly the same as testosterone. It has also been shown to produce dose-dependent increases in bone mineral density and mechanical strength in addition to being able decrease body fat and increase lean body mass. This compound has potential use for all aspects of research hormone replacement therapy and other types of muscle hyperplasia research and could eventually replace testosterone.