YK11 (CAS 1370003-76-1) SARM API

YK11 (CAS 1370003-76-1) is a high-purity selective androgen receptor modulator (SARM) API, featuring a unique steroidal structure that acts as a partial agonist of the androgen receptor. Unlike traditional androgens, it selectively targets skeletal muscle and bone tissue receptors, avoiding widespread systemic effects. In in vitro studies, it has shown stronger anabolic activity than dihydrotestosterone (DHT) in C2C12 myoblasts, effectively promoting muscle cell growth and inhibiting myostatin—a protein that limits muscle development.

With a purity of over 98% and stable chemical properties, this API ensures consistent bioactivity for research applications. It is ideal for studies on muscle wasting disorders, bone health improvement, and body composition regulation. Its solubility in DMSO allows flexible formulation for preclinical trials, making it a reliable raw material for pharmaceutical manufacturers and sports medicine research institutions seeking targeted muscle-growth solutions.