I saw an ad the other day for a peptide company that claims they sell "receptor grade IGF", but, after I called some independent manufacturers of peptides they claim there is no such product that exists. Then after somemore research on different boards it has come to light that if in fact receptor grade exists it is very dangerous to a human. So I want to ask everyone on this forum.......have you ever bought THE GREAT RECEPTOR GRADE IGF ?? This is turning out to be quite the conundrum, which is why I turn to my brethren in iron and ask and seek their opinions.