Best Peptide for Muscle Gain: Top 2026 Picks Insulin like Growth Factor I Extends in VitroReplicative Life Span of Skeletal Muscle Satellite Cells by Enhancing G1 S Cell Cycle Progression via the Activation of Phosphatidylinositol 3 Kinase Akt Signaling Pathway ScienceDirect LONG R IGF I Muscles are most sensitive to growth signals after training. IGF 1 LR3 drives nutrients into muscle cells, boosts protein synthesis and recovery. Triggers muscle growth pathways, and helps nutrients
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