Category: peptide
Aliases: Long-R3-IGF-1, Receptor-Grade IGF-1
70-aa native IGF-1 with (1) N-terminal 13-aa extension from maize IGF-1-like sequence and (2) Arg-3 substitution — together they reduce binding to IGFBPs → more free/bioactive IGF-1 and much longer tissue retention than native IGF-1 (~20 min half-life vs LR3 ~30 h). Originally developed for cell-culture use; popular in research/athletic circles for muscle anabolism.