AOD 9604 Peptide: Fat Loss, Before and After Results, and How It Works What is AOD 9604? Particle Peptides PARTICLE, s. r. o. Aod 9604 frag (fragment 177 191) Non Oxidation AOD 9604 targets the fat signaling region of growth hormone, activating lipolysis while leaving insulin and IGF 1 unchanged. Growth hormone regulates fat metabolism through a specific domain in its molecular structure, the amino acids 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.