O'starine (MK'-2866) is a SA developed by GTX for the prevention and treatment of muscle wasting.It may eventually be a medical prescription for the prevention of cachexia, atrophy and sarcopenia as well as for Hormone Replacement Therapy.

As a research chemical, O'starine belongs to a class of chemicals know as SA. SA create selective anabolic activity at certain androgen receptors. In comparison to test and other steroids raw powder, the advantage of SA, is they do not have androgenic activity in non-skeletal muscle tissues. O'starine is effective in maintaining and increasing lean body mass.

O'starine is a potent and tissue-selective (SA) for treatment of conditions such as muscle wasting and osteoporosis. These patent products for research purposes only use. O'starine is an orally bioavailable nonsteroidal selective .Therefore, o'starine can be used for treatment of conditions such as muscle wasting and osteoporosis.