Been away for a while..but still seeing the same thing...The ONLY legit IGF-1R3 (not regular IGF-1 which there is now tons of suppliers/manufactures) is sold through JRH who is owned by Sigma Aldrich. They are the only companies with the rights to sell this agent. Please check REAL biochemical companies catalogs and websites or go onto Sigma's or JRH. If it is being manufactured in China (which it may now be..just like everything else now-a-days) they are doing it black market. There isn't any American or EU cell culture or biotech company using it...They all have to go through JRH..trust me I sold biochemicals and reagents for a biotech company and just moved into the cell culture sales areana..I deal with this shit all day long at work.