Advanced Molecular Labs Ecdysterone Supplements provide natural anabolic support, supplying 500mg beta-ecdysterone (derived from Cyanotis Arachnoidea) to aid muscle protein synthesis and lean mass gains.* Each serving of AML Ecdysterone also includes 2,000IU Vitamin D3 (cholecalciferol). Vitamin D3 is the most active form of Vitamin D that serves a number of roles in the body including cell growth, neuromuscular function, and immune function. It also helps support the synthesis of numerous steroid hormones in the body, including testosterone.