Ecdysterone is a type of ecdysteroid. Ecdysteroids are insect androgenic hormones (male hormones) that are involved in molting and in the reproduction of insects. They are also found in some plants that create ecdysteroids in response to environmental stress. In humans, it can enhance muscle mass while also increasing general health. Ecdysteroids are structurally similar to androgens with the added benefit of not affecting any androgenic hormones nor do they have the same negative health effects as androgenic substances such as steroids.