IGF 1 LR3 Peptide Therapy Muscle Growth & Recovery Esthetic Solutions Same molecule. Longer leash. IGF 1 LR3 is a long arginine 3 analog of insulin like growth factor 1. The Arg3 substitution prevents binding to IGFBP 3, the carrier protein that normally clears IGF 1 from circulation. Half life IGF1 LR3 (1mg) Nordsci Late life targeting of the IGF 1 receptor improves healthspan and lifespan in female mice Nature Communications
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