IGF 1 LR3 Muscle Growth & Performance The Biohacker IGF 1 LR3 Kallista Labs 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 IGF 1 LR3 1mg Peptide: Growth Factor Research
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