Fragment 176 191 (5mg) AOD 9604 Peptide: Fat Loss, Before and After Results, and How It Works Seth AOD9604 is a Hexadecapeptide originally developed as an analogue of HGH with the express purpose of fighting fat. This peptide is a modified version of fragment 176 191, which is itself AOD 9604: The most targeted fat loss peptide you've probably never heard of. This HGH fragment was literally engineered to burn fat without the blood sugar chaos that comes with full growth hormone.