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Turkesterone by Repp Sports is a naturally occuring ecdysteroid that serves as the primary bioactive component of the Ajuga Turkestanica plant. Ecdysteroids are a structurally related class of compounds to androgens. Ecdysteroids have been extensively studied as growth factors for plants and insects.

Although no human trials are currently available, promising evidence for in vitro studies on human muscle fibres and a variety of animal models demonstrating enhanced growth rates with ecdysteroid ingestion is available. Indeed, ecdysterone, a chemically related compound to Turkesterone, was suspected of being used by Russian Olympic athletes in the 1980’s (dubbed the “Russian Secret”), sparking an explosion of scientific research into the use of ecdysteroids in athletic performance.