There's a lot of confusion around peptides and muscle. Here's how I actually think about it. Most peptides don't build muscle directly. They improve the systems that allow muscle to grow. First, Attenuated glucose stimulated insulin secretion during an acute IGF 1 LR3 infusion into fetal sheep does not persist in isolated islets Journal of Developmental Origins of Health and Disease Cambridge Core IGF 1 LR3 Capsule Suppliers, Manufacturers, Factory Wholesale Price Bloom Tech IGF1 LR3 Protein, Human, Recombinant TargetMol Biomol.com