What is AOD-9604?
AOD-9604 stands for Anti-Obesity Drug 9604. It is a small synthetic peptide — basically a short chain of amino acids — that was snipped from a specific region of human growth hormone (hGH). Scientists isolated just the tail end of the hGH molecule, the part thought to be responsible for breaking down fat. The idea was to keep the fat-burning signal while leaving behind the parts of growth hormone that raise blood sugar or drive unwanted tissue growth.
Early research placed AOD-9604 in Phase IIa clinical trials as a potential obesity treatment, making it one of the few peptides in this category to reach human testing.[1] Today it remains a research-use-only compound — it is not approved as a medicine anywhere, and nothing on this page should be read as medical advice.
How AOD-9604 Works
Think of human growth hormone as a Swiss Army knife — it does many jobs at once. AOD-9604 is like pulling out just the small scissors on that knife: the fragment designed for one specific task, cutting through stored fat.
More precisely, AOD-9604 is believed to stimulate lipolysis — that is the process where fat cells release stored fat so the body can burn it — without triggering the blood-sugar-raising effects that full-length growth hormone can cause.[1] Researchers also note that, as a growth hormone secretagogue fragment, it may activate IGF-1 signaling pathways involved in tissue repair and satellite cell activity, which has sparked interest in musculoskeletal research as well.[2]
What the Research Shows
Most of the evidence for AOD-9604 comes from preclinical studies — meaning experiments done in cells or animals, not large human trials. Here is what that research landscape looks like:
- Obesity and fat loss: Early-stage research showed AOD-9604 could reduce body fat in obese animal models without meaningfully affecting blood glucose levels — a key advantage over full hGH.[1] Those encouraging results were enough to push the compound into Phase IIa human trials for obesity.[1][6]
- Cartilage and joint repair: More recently, AOD-9604 has been grouped among therapeutic peptides being explored in orthopaedics. Preclinical work suggests potential for cartilage regeneration, particularly in osteoarthritis models, though researchers are quick to note that rigorous human clinical trials are still lacking.[2]
- Sports medicine context: Reviews of peptides used (and misused) in sports medicine list AOD-9604 among unapproved compounds that show favorable metabolic and tissue-repair signals in animal models, while stressing that human safety data remain scarce.[4]
- Anti-doping testing: Because AOD-9604 is derived from growth hormone, sports drug testers have studied whether it would interfere with standard hGH doping tests. Research found that AOD-9604 does not affect the World Anti-Doping Agency (WADA) hGH isoform immunoassay — but it can still be detected separately using mass spectrometry techniques.[3][5]
What AOD-9604 Is Being Studied For
Based on the published research, AOD-9604 is currently of interest to scientists in two main areas:
- Metabolic research — specifically how the body breaks down fat (lipolysis) and whether a growth hormone fragment can do that job without the downsides of full hGH.[1]
- Musculoskeletal and orthopaedic research — including potential cartilage regeneration in joint conditions like osteoarthritis, as part of a broader wave of therapeutic peptide investigation.[2][4]
Remember: preclinical results do not automatically translate to humans. Researchers emphasize that while animal data are promising, the evidence base for safe and effective human use is still being built.[4]
How AOD-9604 Is Dosed in Research
Dosing in published preclinical studies varies by research goal, and the specific amounts and schedules used in those experiments are laid out in the dosage chart on this page — check it for the full breakdown of models, doses, frequencies, and durations. If you want to explore how those figures scale or compare, the interactive calculator on this page can help you work through the numbers. As always, these are reference figures drawn from animal research and are provided strictly for scientific context, not as guidance for human use.
Mixing and Storing AOD-9604
AOD-9604 is typically supplied as a lyophilized powder — a freeze-dried white or off-white cake in a sealed vial. Before it can be used in a laboratory setting, it needs to be reconstituted, meaning dissolved back into a liquid.
In research settings, bacteriostatic water (sterile water with a small amount of benzyl alcohol added as a preservative) is the standard diluent. The vial should be kept cold and dark before opening — most researchers store lyophilized peptides at –20 °C (–4 °F) until use. After reconstitution, the solution is generally kept refrigerated at 2–8 °C (36–46 °F) and used within a few weeks, as peptide solutions can degrade over time.
When adding the diluent, inject the liquid slowly down the side of the vial rather than directly onto the powder cake. Swirl gently — do not shake vigorously, as that can damage the peptide structure. Always inspect the solution for particles or cloudiness before use; if it looks off, discard it. These are standard good-laboratory-practice steps that apply to most research peptides.
Sources
- AOD-9604 Metabolic. — Current opinion in investigational drugs (London, England : 2000), 2004. PMID 15134286.
- Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions. — Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews, 2026. PMID 41490200.
- AOD-9604 does not influence the WADA hGH isoform immunoassay. — Drug testing and analysis, 2013. PMID 24124033.
- Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance. — Sports medicine (Auckland, N.Z.), 2026. PMID 41966639.
- Human sports drug testing by mass spectrometry. — Mass spectrometry reviews, 2017. PMID 26213263.
- Gateways to clinical trials. — Methods and findings in experimental and clinical pharmacology, 2005. PMID 15834452.
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