Cyanotis arachnoisea Extract Ecdysterone was found to occur naturally in plants (e.g., Suma and Rhaponticum). Today, ecdysterone is available to bodybuilders everywhere. Ecdysterone is an exciting discovery because it is a natural anabolic agent. In fact, steroid biochemists have classified ecdysterone as a biostimulator: a biologically-active steroidal substance which can exert anabolic actions in the body.