Many teens are turning to risky, unregulated supplements to boost their looks, warns a leading group of U.S. pediatricians.

These products -- including protein powders, steroids and diet pills -- are often useless at best, toxic at worst, said the American Academy of Pediatrics in a new report.

"Doctors think of performance-enhancing substance use as an athlete problem, but many non-athletes are using these substances for appearance enhancement," said Dr. Michele LaBotz, a report co-author.

Boys go for protein supplements, caffeine, steroids and creatine, which revs up energy in cells. Nonprescription weight-loss supplements are popular among girls, the researchers reported.

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