The primary hormone responsible for muscle building is testosterone.
The primary hormone responsible for muscle building is testosterone . 🧬 Key Hormones Involved in Muscle Growth (Hypertrophy): 1. Testosterone Main anabolic hormone (anabolic = muscle building). Increases protein synthesis , which helps repair and grow muscle fibers. Boosts growth hormone release and IGF-1 production. Both men and women produce it (men in higher amounts). 2. Growth Hormone (GH) Stimulates cell growth , tissue repair , and fat metabolism . Promotes the production of IGF-1 in the liver and muscles. 3. Insulin-like Growth Factor 1 (IGF-1) Works closely with GH. Increases muscle cell proliferation and protein synthesis . Plays a key role in muscle recovery and growth after exercise. 4. Insulin Helps transport glucose and amino acids into muscle cells. Enhances nutrient uptake , which supports muscle repair and growth. Acts as an anabolic hormone when balanced (not chronically high). 5. Cortisol (Opposes Mus...