Ecdysterone is a purified phytoecdysteroid (MW 480.64), isolated by ethanol extraction and chromatography from plants rich in ecdysteroids (Cyanotis arachnoidea, Rhaponticum carthamoides, spinach).
It acts on ERβ receptors to support muscle protein synthesis, strength, and recovery without androgenic side effects, used in sports-nutrition supplements and research applications.