IGF-1 vs Testosterone: Which One Actually Builds Muscle and Strength?
By Mike Mahler
In recent years, IGF-1 has become the new buzzword in the muscle-building world. Growth hormone protocols, peptides, and IGF-1 discussions are everywhere, leading many to ask an important question: Is IGF-1 more important than testosterone for building muscle and strength? The short answer is no—but the complete answer requires understanding how testosterone, IGF-1, and estrogen interact. Because …
