Ecdysterone (Turkesterone) for Exercise Performance

Research suggests that ecdysterone and turkesterone may support exercise performance and muscle development, with the most direct human evidence coming from a 2019 randomized controlled trial that found ecdysterone supplementation during a 10-week strength training program led to significant increases in muscle mass. Several reviews spanning 2008 to 2024 generally support the idea that phytoecdysteroids possess anabolic properties relevant to exercise performance, including potential reduction of muscle fatigue, though most of this supporting literature acknowledges that robust human clinical data remain limited. Findings are not uniformly positive, as a 2024 acute dosing study found no significant effect on IGF-1 levels or resting metabolic rate, and a 2026 case report raised safety concerns by documenting rhabdomyolysis in an athlete using beta-ecdysterone alongside other supplements, though causation could not be established given the multi-supplement context. Overall, the body of evidence is promising but preliminary, consisting largely of reviews and mechanistic arguments rather than multiple large-scale human trials, and the interest from anti-doping authorities in developing detection methods for ecdysteroids reflects ongoing uncertainty about their status and real-world use in competitive sport.