IGF-1LR3 is produced by recombinant DNA technology,it is a highly purified protein with 83 amino acid residues. Biological potency is determined using a cell proliferation bioassay. We have two kinds of IGF-1LR3 products,100mcg/vial and 1000mcg/vial.We certifiy that our IGF-1LR3 products are qualified.Because we operate the best technics and process,our cost is the lowest of the world,so our sales price is the lowest too.