anti-doping analysis raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-03-22 and is reviewed periodically as new material appears.
AOD-9604 is listed as a prohibited substance in sport by the World Anti-Doping Agency. It falls under the peptide hormones, growth factors, related substances, and mimetics class on the prohibited list. Anti-doping organizations treat its presence in an athlete's sample as an adverse finding unless a therapeutic use exemption applies. The prohibition reflects concerns about performance enhancement in competitive settings and the difficulty of distinguishing exogenous peptide use from endogenous hormone fragments.
Detection of AOD-9604 in biological samples relies on analytical techniques capable of distinguishing a small synthetic peptide from related endogenous sequences. Liquid chromatography coupled with tandem mass spectrometry is commonly used for confirmatory analysis. Sample preparation may involve immunoaffinity enrichment or solid-phase extraction to concentrate the peptide. Because the molecule is small and may be present at low concentrations, assay sensitivity and specificity are ongoing analytical challenges. Laboratories also validate methods against reference materials when available.
Proposed mechanisms for AOD-9604 focus on fat cells. Laboratory studies suggest the peptide can increase lipolysis, the breakdown of stored fat, and reduce lipogenesis, the formation of new fat. Unlike full human growth hormone, it does not appear to stimulate substantial IGF-1 production in the studies reported so far. Some evidence points to beta-adrenergic signaling, but the precise receptor targets and downstream pathways remain unresolved. The fragment is not thought to act through the classical growth hormone receptor.
Clinical development of AOD-9604 included trials in people with obesity. Reports from early-phase and mid-phase studies described modest or inconsistent changes in body weight. A phase IIb program did not meet its primary endpoint, and the compound was not approved for medical use. Differences in formulation, delivery route, and participant characteristics may explain some of the variation. Later investigations explored whether the peptide might have effects in other tissues, including cartilage.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA under peptide hormones |
| WADA class | S2 | Peptide hormones, growth factors, related substances, and mimetics |
| Approved therapeutic use | Not established | Clinical research did not lead to broad marketing approval |
| Common detection method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry |
| Sample preparation | Extraction and enrichment | Immunoaffinity or solid-phase extraction may be used |
AOD-9604 is typically supplied as a lyophilized white to off-white powder. In this form, it is relatively stable when kept cool, dry, and protected from light. Common storage recommendations place it at −20 °C or below for long-term retention. Reconstituted solutions are less stable and are often kept at 2–8 °C for short periods. Freeze-thaw cycles should be minimized because they can promote aggregation or loss of peptide content. Vials are usually sealed under inert gas to reduce oxidation.
Identity and purity are commonly checked with reversed-phase high-performance liquid chromatography and mass spectrometry. RP-HPLC separates the peptide from related impurities and can estimate purity by peak area. Mass spectrometry confirms molecular mass and helps detect sequence variants or truncations. Some laboratories use amino acid analysis or peptide mapping for additional characterization. No single method proves biological activity; these techniques establish chemical identity and purity only. They also require suitable reference standards for confident comparison.
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.
=== Aromatase inhibitors === Aromatase inhibitors are an important class of drugs used for the treatment of breast cancer in postmenopausal women. At menopause, estrogen production in the ovaries ceases, but other tissues continue to produce estrogen through the action of the enzyme aromatase on androgens produced by the adrenal glands. When the action of aromatase is blocked, estrogen levels in post-menopausal women can drop to extremely low levels, causing growth arrest and/or apoptosis of hormone-responsive cancer cells.
DisplayPort 2.1 has tightened its alignment with the USB Type-C specification as well as the USB4 PHY specification to facilitate a common PHY servicing both DisplayPort and USB4. In addition, DisplayPort 2.1 has added a new DisplayPort bandwidth management feature to enable DisplayPort tunnelling to coexist with other data traffic more efficiently over the USB4 link.
George Rennie (1801 or 1802 in Phantassie, East Lothian – 1860 in London), sculptor, politician and governor Mary Ellaline Terriss, Lady Hicks (1871 in Stanley – 1971 (aged 100) in Hampstead, London), known professionally as Ellaline Terriss, a popular English actress and singer, best known for her performances in Edwardian musical comedies Edward Binnie (1884 in Stanley – 1956 in Sandefjord, Norway), the second resident magistrate of South Georgia, serving from October 1914 to April 1927, when he resided at King Edward Point; previously served as customs officer on East Falkland Island McDonald Hobley (1917 in Stanley – 1987), one of the first BBC Television continuity announcers from 1946 to 1956 Sir Rex Hunt CMG (1926 in Redcar – 2012 in Stockton on Tees), Governor during the Falklands War Gerald Reive (born 1937 in the Falkland Islands), a New Zealand-based athlete, a lawn bowler at the 2010 Commonwealth Games Terry Peck MBE, CPM (1938 – 2006 both in Stanley), soldier, policeman and legislator Edward Neill "Ted" Baker CNZM (born 1942 in Stanley), a New Zealand scientist specialising in protein purification and crystallization and bioinformatics Alejandro Betts (1947 – 2020), a Falklands-born Argentine air-traffic controller, notable for being the only Falkland Islander to support Argentina's claim to the Falkland Islands Mensun Bound (born 1953 in Port Stanley) is a British marine archaeologist, based in Oxford, Triton Senior Research Fellow in Marine Archaeology at Oxford University James Peck (born 1968 in Stanley), an artist and writer who at one time held both Argentine and British citizenship but has since renounced his Argentine citizenship.
Sources: en.wikipedia.org
A paradox of German policy was that the collaborators such as Hácha were held in contempt by the Nazis as "riff raff" while those who clung most defiantly to their sense of Czech identity were considered to be the better subjects of Germanizaton. Heydrich in a report to Berlin stated that Hácha was "incapable of Germanization" as "he is always sick, arrives with a trembling voice and attempts to evoke pity that demands our mercy". By contrast, Heydrich had a grudging respect for Elias, noting that he was youthful, healthy, and a determined defender of Czech interests, which led Heydrich to conclude that he must have some German blood. Aside from the inconsistency of animosity towards Slavs, there is also the fact that the forceful but restrained policy in Czechoslovakia was partly driven by the need to keep the population nourished and complacent so that it can carry out the vital work of arms production in the factories. By 1939, the country was already serving as a major hub of military production for Germany, manufacturing aircraft, tanks, artillery, and other armaments.
== See also == Maintenance respiration: maintenance as a functional component of cellular respiration Microphysiometry Pasteur point Respirometry: research tool to explore cellular respiration Tetrazolium chloride: cellular respiration indicator Complex 1: NADH:ubiquinone oxidoreductes
Another important application of solvent extraction is in the separation of the lanthanoids. This process also uses TBP and the complexes are extracted into kerosene. Separation is achieved because the stability constant for the formation of the TBP complex increases as the size of the lanthanoid ion decreases. An instance of ion-pair extraction is in the use of a ligand to enable oxidation by potassium permanganate, KMnO4, in an organic solvent. KMnO4 is not soluble in organic solvents. When a ligand, such as a crown ether is added to an aqueous solution of KMnO4, it forms a hydrophobic complex with the potassium cation which allows the uncharged ion pair [KL]+[MnO4]− to be extracted into the organic solvent. See also: phase-transfer catalysis. More complex partitioning problems (i.e. 3 or more phases present) can sometimes be handled with a fugacity capacity approach.
Sources: en.wikipedia.org
Yes, the World Anti-Doping Agency classifies AOD-9604 as a prohibited peptide hormone and related substance. Its use by athletes is banned under the relevant anti-doping code.
Confirmatory detection typically uses liquid chromatography with mass spectrometry. Immunoassays may be used for screening, but mass spectrometry provides structural confirmation.
No widely approved therapeutic indication exists for AOD-9604. It has been investigated in clinical studies, but regulatory approvals for general medical use are not established.
No. Major drug regulators have not approved AOD-9604 for weight loss or any other therapeutic indication. It remains an investigational compound studied in research settings.