IGF 1 LR3 tells your muscle cells to grow, repair, and absorb nutrients better. It works directly at the muscle level to help you build lean muscle and recover faster.What it is IGF 1 IGF 1 LR3 Kallista Labs IGF 1 & LR3 (Build Blend) Peptide Therapies Elite Health HRT IGF 1 LR3 PEPTIDE 1MG 10MG VIAL UMBRELLA Labs IGF 1LR3 Late life targeting of the IGF 1 receptor improves healthspan and lifespan in female mice Nature Communications