Selective androgen receptor modulators have steroid effects but are believed to be safer, without many of the harmful side effects of steroids.
SARMs work similarly to testosterone but in a more targeted way. "They are effective by binding to the steroid receptor in only specific tissue, like muscle," says Evans, who is also a scientific advisor to GTx, a company developing the drugs. "They are not steroid drugs, but they produce the anabolic effect of the steroids." GTx, based in Memphis, TN, has shown in a clinical trial that one compound being developed for muscle wasting and bone loss can significantly boost lean muscle mass in older people.
Analysis of the solution revealed the presence of S-4 at approximately 150 mg/mL with equal amounts in each container, yielding a total of 4.5 g of the SARM
The research appears in the current issue of the journal Drug Testing and Analysis.
Various anecdotal reports from body building discussion boards are indicating effective muscle building results from SARM S4
There are some posted logs and journals where people track the results of their SARM S4 usage.
There is a lot of fake SARMs being sold as well.