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Recently, a new type of supplement has been making the rounds online as a “legal” alternative to steroids. Selective androgen receptor modulators, known as SARMs, are drugs that are said to boost your athletic performance and make you look more muscular by mimicking the effects of testosterone without the negative side effects of using steroids, like damaging your liver or shrinking your balls.

But according to a new study published in JAMA, many products containing SARMs you can find online contain unapproved substances, hormones, and steroids. What’s more, most of the labels slapped onto these supplements are completely misleading.

For the study, the researchers analyzed 44 drugs marketed and sold as SARMS using procedures approved by the World Anti-Doping Agency for detecting banned substances in athletes. They found that 39 percent of the supplements tested contained unapproved drugs, like banned growth hormones or steroids, while 25 percent contained similar substances not even included on the label. In 59 percent of the products, the amount of compounds listed on the label was significantly different than what the analysis actually found.

“The compounds found in our analyses have not been approved by the FDA. Therefore, the pharmaceutical companies which were or are developing these compounds cannot sell these products and a physician cannot prescribe these drugs to patients,” explains study co-author Shalender Bhasin, M.B., B.S., professor of medicine at Harvard Medical School and director of the research program in men’s health at Brigham and Women’s Hospital. “Also, because these compounds are not approved by the FDA, there is very little information about their safety and efficacy. Some of the compounds have never been studied in humans.”