Everything below concerns synthetic peptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-07-06. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory treatment of AOD-9604 has varied. In sports anti-doping, the peptide became widely discussed during a 2013 investigation into an Australian professional sports club. Authorities at the time debated whether it fell under prohibitions on growth hormone and related substances. Later clarifications and updated lists have addressed the compound in different ways. Anyone seeking current status should consult the latest applicable rules, and commercial supply for human use is not authorized in major markets.
Research interest in AOD-9604 often focuses on whether it can influence lipid metabolism without the growth-promoting or glucose-related effects of full-length hGH. This question remains unresolved, and findings depend on model, dose, and measurement method. Some reviews treat the peptide as a historical obesity candidate rather than an active therapeutic. Others cite it in discussions of peptide fragments, metabolic signaling, and performance-enhancing substances. Clear conclusions are limited by the small number of rigorous, independent human studies.
AOD-9604 has been investigated primarily as a potential treatment for obesity and related metabolic conditions. Early laboratory work examined its effects on fat cells, and later studies moved into animal models and human clinical trials. Some trials reportedly reached Phase II, but the program did not lead to an approved medicine. Published summaries often note that weight-loss results were modest or inconsistent. The full trial data are not all publicly available in detail.
AOD-9604 is a synthetic peptide whose structure corresponds to a C-terminal segment of human growth hormone. It is often described as hGH fragment 176-191, a 16-amino-acid sequence. The peptide was designed to isolate a region of hGH associated with fat metabolism while avoiding the full hormone's growth-promoting actions. Laboratory and commercial materials typically present it as a lyophilized powder for research use. Its identity is defined by amino acid sequence, not by a single brand.
The fragment includes residues that can form an internal disulfide bond between two cysteine positions. This structural feature can influence how the peptide folds and how stable it is in solution. AOD-9604 differs from full-length hGH in size and receptor interactions; it does not contain the entire growth hormone sequence. Published descriptions sometimes use slightly different residue numbering, so sequence information should be checked against primary sources. The molecule is small compared with intact hGH, which affects analytical detection and purification approaches.
| Property | Value | Notes |
|---|---|---|
| Primary research area | Obesity and metabolic regulation | Studied in cell, animal, and human models |
| Highest reported trial phase | Phase II | Public summaries describe mixed results |
| Common route in trials | Subcutaneous injection | Typical for peptide therapeutics |
| Regulatory example | 2013 Australian anti-doping review | Classification was debated at the time |
| Approval status | Not approved as a human medicine | Status can change by jurisdiction |
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Sources: en.wikipedia.org
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== Further reading == Bright, M.; Plum, C.; Riavitz, L. A.; Nikolov, N.; Martínez Arbizu, P.; Cordes, E. E.; Gollner, S. (2010). "Epizooic metazoan meiobenthos associated with tubeworm and mussel aggregations from cold seeps of the Northern Gulf of Mexico". Deep-Sea Research Part II: Topical Studies in Oceanography. 57 (21–23): 1982–1989. Bibcode:2010DSRII..57.1982B. doi:10.1016/j.dsr2.2010.05.003. PMC 2995211. PMID 21264038. German, C. R.; Ramirez-Llodra, E.; Baker, M. C.; Tyler, P. A.; the ChEss Scientific Steering Committee (2011). "Deep-Water Chemosynthetic Ecosystem Research during the Census of Marine Life Decade and Beyond: A Proposed Deep-Ocean Road Map". PLoS ONE. 6 (8) e23259. Bibcode:2011PLoSO...623259G. doi:10.1371/journal.pone.0023259. PMC 3150416. PMID 21829722. Lloyd, K. G.; Albert, D. B.; Biddle, J. F.; Chanton, J. P.; Pizarro, O.; Teske, A. (2010). "Spatial Structure and Activity of Sedimentary Microbial Communities Underlying a Beggiatoa spp. Mat in a Gulf of Mexico Hydrocarbon Seep". PLoS ONE. 5 (1) e8738. Bibcode:2010PLoSO...5.8738L. doi:10.1371/journal.pone.0008738. PMC 2806916. PMID 20090951. Metaxas, A.; Kelly, N. E. (2010). "Do Larval Supply and Recruitment Vary among Chemosynthetic Environments of the Deep Sea?". PLoS ONE. 5 (7) e11646. Bibcode:2010PLoSO...511646M. doi:10.1371/journal.pone.0011646. PMC 2906503. PMID 20657831. Rodríguez, E.; Daly, M. (2010). "Phylogenetic Relationships among Deep-Sea and Chemosynthetic Sea Anemones: Actinoscyphiidae and Actinostolidae (Actiniaria: Mesomyaria)". PLoS ONE. 5 (6) e10958. Bibcode:2010PLoSO...510958R.
FHA-HUD policy guaranteed that pay lenders would be compensated in full for the mortgage of foreclosed homes and by creating a housing market dominated by mortgage bankers, the FHA incentivized mortgage bankers to drive desperate black families to low-income homeownership, allowing bankers to inflate their economic gains by cycling these black families through tax foreclosures. Therefore, this racist and predatory provision of low-income housing through FHA-HUD policy elucidates that federal government was an inevitable perpetrator of racial segregation within Detroit's housing market. Despite having access to mortgage loans, black Detroiters continued to be preyed upon by real estate bankers who earned tremendous profits from the inability of black Detroiters to keep up with the FHA-insured mortgage payments. For many black Detroiters, the dismissal of FHA redlining did not end the economic exploitation and residential segregation of black families at the hands of wealth-hungry bankers and lenders. Colorblind universalism within Detroit's housing market remained a far-fetched aspiration of Black families in their pursuit of homeownership as FHA-HUD policy failed to dismantle the segregative impulses of the real estate industry. Furthermore, the threat of racial integration in white communities facilitated the rise of neighborhood associations, which were coalitions of independent white homeowners that fervently protected homeownership rights through advocacy for residential segregation.
Sources: en.wikipedia.org
No major medicines regulator appears to have approved AOD-9604 for human therapeutic use. It has been studied in clinical trials, but those programs did not result in a marketed drug.
It became prominent during a 2013 Australian sports investigation that examined whether it was a prohibited growth-hormone-related substance. Subsequent interpretations and list updates have varied, so current rules should be checked directly.
Published summaries generally report limited or inconsistent weight-loss effects, and complete trial data are not widely available. The studies were not sufficient to establish it as an effective obesity treatment.
It is a synthetic peptide based on a C-terminal fragment of human growth hormone. It is commonly referred to as hGH fragment 176-191 and is studied for metabolic effects rather than growth effects.