In this guide, I will break down the science behind these two powerhouses, explain how they differ, and show you how to choose the right one for your needsor even how to use them together safely under professional guidance
Dan Wool, NMD Arizona-licensed Naturopathic Physician and Gastroenterology Specialist Updated: February 26, 2026 Summary (tl;dr): What AOD-9604 Is and How It Works: AOD-9604 is a synthetic 16-amino acid fragment of human growth hormone (hGH) specifically amino acids 176191 engineered to target fat metabolism
Required materials include: Retatrutide vial, bacteriostatic water (BAC water), insulin syringe with needle, alcohol swabs, and clean work surface
It has recently been shown that import of GR1 into the peroxisomes occurs through the Peroxisomal Targeting Sequence 1 (PTS1) pathway, though targeting efficiency was considered to be relatively weak (Kataya and Reumann, 2010)