Research guide for for men — mechanisms, protocols, and independent analysis from Compound Review.
Why IGF-1 LR3 Is Particularly Relevant for Men
IGF-1 LR3 is a synthetic IGF-1 analogue with a 20–30 hour half-life due to reduced insulin-like growth factor binding protein (IGFBP) affinity. In men, declining IGF-1 with age parallels GH decline and contributes to reduced lean mass, increased adiposity, and impaired tissue repair. IGF-1 LR3 bypasses the GH/liver axis to deliver IGF-1 receptor stimulation directly, making it relevant to researchers studying age-related anabolic decline.
IGF-1 LR3 Dosage by Goal
Standard research protocols for men use 20–60 mcg subcutaneously once daily, typically post-workout or before sleep. Higher doses (60–100 mcg) are used in bodybuilding contexts. Cycles are limited to 4 weeks due to receptor desensitization. IGF-1 LR3 should not be combined with insulin without medical supervision due to additive hypoglycemia risk.
Evidence Summary
IGF-1 LR3 is a synthetic IGF-1 analogue with a 20–30 hour half-life due to reduced insulin-like growth factor binding protein (IGFBP) affinity. In men, declining IGF-1 with age parallels GH decline and contributes to reduced lean mass, increased adiposity, and impaired tissue repair. IGF-1 LR3 bypasses the GH/liver axis to deliver IGF-1 receptor stimulation directly, making it relevant to researchers studying age-related anabolic decline.