IGF-1 LR3 is an artificial protein and extended analogue of human insulin-like growth factor 1 (IGF-1). It varies from natural IGF-1 in that it holds an arginine instead of a glutamic acid at the third position in its amino acid sequence (arginine 3) and also has surplus 13 amino acids at its N-terminus (MFPAMPLLSLFVN) for a total of 83 amino acids. Buy now at- https://bmm-supplements.com/product/igf-1-lr3/