Osta is slang for Ostarine (also known as MK-2866 or Enobosarm) which is selective androgen receptor modulator (SARM). Ostarine is an anabolic agent prohibited at all times under the WADA Prohibited List. It can be found in dozens of dietary supplements, and may or may not be listed on the label.
The FDA has made it clear in a recent warning letter that ostarine is an investigational new drug and is NOT a dietary supplement:
“Based on the information available to FDA, ostarine was not marketed as a dietary supplement or as a food until after it was under substantial clinical investigation. Therefore [products] which contain ostarine are also excluded from the definition of a dietary supplement under section 201(ff)(3)(B)(ii) of the FDCA [21 U.S.C. § 321 (ff)(3)(B)(ii)].”
Not only do such products pose significant health risks, the use of ostarine is an anti-doping rule violation regardless of whether you are an elite or a recreational athlete.