Testosterone isocaproate (17β-hydroxyandrost-4-en-3-one isocaproate) is a long-acting ester of testosterone designed to support steady and sustained hormone release. It enhances anabolic activity by promoting nitrogen retention, protein synthesis, and red blood cell production, contributing to increases in muscle mass, strength, and recovery. With a balanced half-life, testosterone isocaproate offers a stable hormonal environment, making it well-suited for both performance enhancement and therapeutic applications.