If you have been reading about human growth hormone and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-07-07. Where a claim depends on a specific study, the study is described rather than over-claimed.
Early interest in AOD-9604 centered on whether a fragment of human growth hormone could influence fat metabolism without the broader effects of the full hormone. Cell and animal studies reported changes in fat storage and breakdown. Human trials followed, but the results were not strong enough to secure regulatory approval. The compound remains available for laboratory research, and its clinical potential is still described as uncertain. Studies continue to examine its activity and safety profile.
AOD-9604 is a synthetic peptide that corresponds to a short section of human growth hormone. It is commonly identified as hGH fragment 176-191 because its sequence matches residues at the C-terminal end of the hormone. The molecule contains sixteen amino acids and is made by solid-phase peptide synthesis. Researchers study it for metabolic effects rather than for the growth-promoting actions associated with full human growth hormone. Its small size distinguishes it from the complete 191-amino-acid hormone.
Several names appear in scientific and commercial settings. AOD9604 and AOD-9604 are development codes used interchangeably, while hGH fragment 176-191 describes the same region. The peptide includes a disulfide bond between two cysteine residues, which helps shape its three-dimensional structure. Different suppliers may provide acetate or other salt forms, and purity can vary. These differences matter because analytical tests and biological assays can respond to the specific form being studied.
Quality varies among research-grade suppliers, so certificates of analysis and independent testing are important for verification. A typical certificate reports purity by HPLC, identity by mass spectrometry, appearance, and sometimes residual solvents or water content. AOD9604 is often sold as a research chemical not intended for human consumption, and labels can be inaccurate. Common misconceptions include treating the peptide as a form of growth hormone, assuming supplement status, or expecting approved-drug quality from unregulated products.
AOD9604 is commonly supplied as a white to off-white lyophilized powder. The powder is typically stored at -20 °C or below, protected from light and moisture, because peptides can degrade through oxidation, hydrolysis, or aggregation. If it is reconstituted for laboratory use, an appropriate aqueous buffer or solvent is chosen, and the solution is kept cold and handled to avoid repeated freeze-thaw cycles. These practices support stability but do not imply suitability for human use.
| Property | Value | Notes |
|---|---|---|
| Common name | AOD-9604 | Development code used in scientific literature. |
| Chemical class | Synthetic peptide | Fragment of human growth hormone. |
| Amino acid length | 16 residues | Matches hGH region 176-191. |
| Appearance | White to off-white powder | Typical lyophilized peptide solid. |
| Solubility | Soluble in water | Dissolves in aqueous media; exact behavior depends on salt form. |
AOD-9604 is prohibited in sport by the World Anti-Doping Agency under the peptide hormone class. Its presence in a sample can be detected through mass spectrometry-based methods, although the exact assay depends on the laboratory. In research settings, material is often supplied as a lyophilized powder for reconstitution. Buyers and researchers should note that products labeled AOD-9604 may vary in purity and actual peptide content. Analytical certificates and independent testing are common ways to verify identity, but no global harmonized standard exists for all commercial lots.
AOD-9604 is a synthetic peptide whose sequence is modeled on the C-terminal region of human growth hormone. Published descriptions commonly place it as a modified fragment corresponding to hGH amino acids 176–191, with a tyrosine residue added or retained at the N-terminus to support detection and handling. It is not intact growth hormone and lacks the full receptor-binding architecture of the parent protein. The molecule was developed as a research candidate for metabolic studies rather than as a replacement for growth hormone therapy. Its identity is defined by its amino acid sequence rather than by any single commercial preparation.
AOD-9604 drew attention in the 1990s and 2000s as a potential anti-obesity agent. Early work explored both injectable and oral routes, which is unusual for a peptide of this size. Animal studies reported changes in fat metabolism without the growth-promoting or insulin-like effects associated with full-length growth hormone. Subsequent human trials produced mixed or modest results, and the compound did not obtain regulatory approval for weight management in major markets. It remains known mainly through research literature, sports anti-doping listings, and non-approved supplement advertising.
Quality control for AOD-9604 involves verifying identity, purity, and concentration. Suppliers may provide a certificate of analysis listing HPLC purity and mass spectrometry data. Independent verification is advised because peptide products can vary in quality. Researchers should check for counterions, residual solvents, and microbial contamination. Proper documentation supports reproducibility and safety in laboratory studies. When sourcing, institutions often require third-party testing and detailed chain-of-custody records. These steps help ensure that experimental results are attributable to the peptide rather than impurities.
Analytical characterization of AOD-9604 typically employs reversed-phase high-performance liquid chromatography (RP-HPLC) to assess purity and identity. Mass spectrometry provides confirmation of molecular mass, while amino acid analysis can verify composition. These methods are standard for peptide research chemicals. Because the peptide lacks a distinct chromophore, detection often relies on ultraviolet absorbance at 214 nm or mass spectrometric response. Laboratories may also use capillary electrophoresis for separation. For example, size-exclusion chromatography can detect aggregates.
Stability of AOD-9604 depends on storage conditions. Lyophilized powder is generally more stable than reconstituted solution. Recommended storage is typically at -20°C or lower, protected from light and moisture. Repeated freeze-thaw cycles can cause aggregation or degradation. In solution, the peptide may be susceptible to hydrolysis or oxidation, so aliquoting and cold storage are common practices. Researchers often add stabilizers such as mannitol or trehalose during lyophilization to improve shelf life.
1 November – Sporting's Ruben Amorim is announced as Manchester United's new head coach. He will take charge on 11 November. 2 November Kemi Badenoch wins the Conservative leadership election, defeating rival Robert Jenrick after securing the support of party members. A joint investigation carried out by Channel 4's Dispatches and The Sunday Times reveals the extent of rent received by the Royal Estate from schools, the National Health Service and the armed forces. 4 November An elderly British couple, reported missing in Spain's recent flash flooding, are found dead in their car. Education Secretary Bridget Phillipson announces that university tuition fees in England, fixed at £9,250 a year since 2017, will be increased from 2025. Two more cases of Clade 1b mpox are identified in the UK, in household contacts of the first patient. 5 November Buckingham Palace announces that Queen Camilla has cancelled a number of scheduled engagements due to a chest infection. Health Secretary Wes Streeting announces that the NHS will review its policy on testing for prostate cancer following Sir Chris Hoy's "powerful" call for younger men to get tested. The UK government announces that the Tobacco and Vapes Bill will include plans to ban smoking outside schools and hospitals in England, but will not extend the ban to beer gardens as had been previously proposed. Figures published by the British Retail Consortium indicate a 0.6% growth in retail sales during October, a figure lower than September, and attributed to the later October half term and people waiting for Black Friday deals.
== Drug liberalization == Drug liberalization as a harm-reduction strategy gives the ability to treat substance use disorder solely as a public health issue rather than a criminal activity. This enables other harm-reduction strategies to be employed, which results in a lower incidence of HIV infection.
The cave is quite outstanding and refined, either in terms of architecture and decoration, and departs from the mainstream of other caves at Kizil. Marianne Yaldiz has called it "One of Xinjiang's Mysteries". Untypically, the narrative scenes are placed over the entrance, taking second position to the monumental standing Buddhas of the side wall. This is a layout which became popular farther east in Gansu. In a final narrative evolution, the cave magnifies the figure of the Buddha, and gives an ever smaller role to secondary figures and stories.
== Appearances == Half-Life opens on Gordon Freeman as a research assistant at the Anomalous Materials wing of the Black Mesa Research Facility. After donning the Hazardous Environment suit for an experiment, Freeman survives an interdimensional "resonance cascade", taking up a crowbar as his signature weapon and fighting his way across the facility against both extradimensional invaders and hostile US marines to seal the rift. In Half-Life 2, after being kept in stasis for nearly two decades, Freeman battles the Combine Empire to liberate Earth. He gains legendary status as part of the resistance against the Combine forces and sparks a rebellion, ultimately destroying the Citadel, a major Combine stronghold. The G-Man rescues Freeman after this critical event, praising his accomplishments and placing him back in stasis. In Episode One, Gordon Freeman and Alyx Vance work to stabilize the Citadel's core to prevent a catastrophic explosion. In Episode Two, they work together to transport crucial data to close a forming super portal. After a revelation from the G-Man about saving Alyx, they learn about the Borealis, a research vessel with the potential to cause significant events. The game ends with Alyx mourning her father's death at the hands of a Combine Advisor. Half-Life: Alyx, set five years before Half-Life 2, follows Alyx Vance trying to locate Gordon. She infiltrates a Combine vault, believing it holds Gordon, but instead releases the G-Man.
== Four engineering approaches == Synthetic biology has traditionally been divided into four different engineering approaches: top down, parallel, orthogonal and bottom up. To replicate emergent behaviours from natural biology and build artificial life, unnatural chemicals are used. The other looks for interchangeable components from biological systems to put together and create systems that do not work naturally. In either case, a synthetic objective compels researchers to venture into new area in order to engage and resolve issues that cannot be readily resolved by analysis. Due to this, new paradigms are driven to arise in ways that analysis cannot easily do. In addition to devices that oscillate, creep, and play tic-tac-toe, synthetic biology has produced diagnostic instruments that enhance the treatment of patients with infectious diseases.
Sources: en.wikipedia.org
Kamal al-Labwani, a prisoner of conscience who had three years added to his 12-year sentence for allegedly "broadcasting false or exaggerated news which could affect the morale of the country", on account of remarks he was alleged to have made in his prison cell. Nabil Khlioui, an alleged Islamist from Deir ez-Zor, who with at least 10 other Islamists, most are presumed to be from Deir al-Zour, remained in incommunicado detention without charge or trial at the end of 2009. Mashaal Tammo, the killed spokesperson for the unauthorized Kurdish Future Current group, who was 'held incommunicado for 12 days and charged with "aiming to provoke civil war or sectarian fighting", "conspiracy" and three other charges commonly brought against Kurdish activists, charges that could lead to the death penalty. Twelve leaders of a prominent gathering of opposition groups, the Damascus Declaration, continue to serve 30-month prison terms. Among those detained is Riad Seif, 62, a former member of parliament who is in poor health. Habib Saleh was sentenced to three years in jail for "spreading false information" and "weakening national sentiment" in the form of writing articles criticizing the government and defending opposition figure Riad al-Turk. One released prisoner was Aref Dalila. He had served seven of the ten years in his prison sentence, much of it in solitary confinement and in increasingly poor health, for his involvement in the so-called "Damascus Spring" before being released by a presidential pardon.
In 2012, the American Academy of Dermatology published appropriate use criteria (AUC) on Mohs micrographic surgery in collaboration with the following organizations: American College of Mohs Surgery; American Society for Mohs Surgery; and the American Society for Dermatologic Surgery Association. More than 75 physicians contributed to the development of the Mohs surgery AUC, which were published in the Journal of the American Academy of Dermatology and Dermatologic Surgery. The Australasian College of Dermatologists, in concert with the Australian Mohs Surgery Committee, has also developed evidence based guidelines for Mohs Surgery. The Mohs procedure is a pathology sectioning method that allows for the complete examination of the surgical margin. It is different from the standard bread loafing technique of sectioning, where random samples of the surgical margin are examined. Mohs surgery is performed in four steps:
=== 1990 === January 13, 1990 – The Stasi, the secret police of East Germany, is dissolved. January 22, 1990 – the League of Communists of Yugoslavia, the ruling party of the Socialist Federal Republic of Yugoslavia, is dissolved during its congress, ending the one party system in the country. February 1, 1990 – StB, the secret police of Czechoslovakia is dissolved. March 15, 1990 – Inauguration of Gorbachev as the first president of the Soviet Union. April 12, 1990 – The Socialist Republic of Slovenia within Yugoslavia holds its first multi-party elections. April 22–23 and May 6–7, 1990 – the Socialist Republic of Croatia within Yugoslavia holds its first multi-party elections. April 25, 1990 – Violeta Chamorro is sworn in as president of Nicaragua, ending the Sandinista rule and the Contras insurgency. May 22, 1990 – South and North Yemens are unified. June 8, 1990 – the Message from Turnberry, described as the "first official recognition of the end of the Cold War", is issued. July 5–6, 1990 – NATO holds its 11th summit in London. July 13, 1990 – The 28th Congress of the Communist Party of the Soviet Union announces the end of its monopoly of power. August 2, 1990 – Beginning of Gulf War. September 9, 1990 – Helsinki Summit between Bush and Gorbachev. September 12, 1990 – The Treaty on the Final Settlement with Respect to Germany is signed in Moscow. October 3, 1990 – Official reunification of Germany. November 6, 1990 – Hungary become the first Soviet Bloc country to join the Council of Europe.
Tamales – although largely associated with Mexico, and its indigenous Mesoamerican origin, records from the Iroquoian people show that they too made such a dish. Taxation – the Inca had a sophisticated taxation system, the mit'a, using quipus (knotted strings) as recording devices. Quipus were transported through the Inca road network messengers (chaskis) and administered by the quipu authorities (quipucamayoc). Tipi – a cone-shaped, portable dwelling popularized by Plains Indians (Native Americans and First Nations) of the Great Plains and the Canadian Prairies. Tipis were warm, durable, comfortable, and could be easily disassembled and packed. A settlement could be ready to move in about one hour. Tlingit armor – Tlingit armor was worn by coastal Indigenous nations in Alaska and British Columbia. Tlingit warriors wore battle helmets depicting either crest animals or ancestors, along with wooden visors, thick leather tunics, and body armor covered with wooden slats or coins. This battle attire combines technology, ingenuity, and symbolic power and protection. Tobacco – tobacco was used in the Americas for many centuries prior to the arrival of white Europeans. Consumed in high doses, tobacco can become highly hallucinogenic and was accordingly used by many indigenous peoples in the Americas to inspire dreams and dreamtime. Tobacco was also often consumed as a medicine amongst some tribes, although this was strictly practiced by experienced shamans and medicine men.
=== Disadvantages === Insulin pumps, cartridges, and infusion sets may be far more expensive than syringes used for insulin injection with several insulin pumps costing more than $6,000; necessary supplies can cost over $300. Another disadvantage of insulin pump use is a higher risk of developing diabetic ketoacidosis if the pump malfunctions. This can happen if the pump battery is discharged, if the insulin is inactivated by heat exposure, if the insulin reservoir runs empty, the tubing becomes loose and insulin leaks rather than being injected, or if the cannula becomes bent or kinked in the body, preventing delivery. Therefore, pump users typically monitor their blood sugars more frequently to evaluate the effectiveness of insulin delivery.
Sources: en.wikipedia.org
They recommend yearly evaluation regarding possible improvement and, if none, to discontinue testosterone; physicians should consider intramuscular treatments, rather than transdermal treatments, due to costs and since the effectiveness and harm of either method is similar. Testosterone treatment for reasons other than possible improvement of sexual dysfunction may not be recommended. Current clinical guidelines recommend comprehensive baseline evaluation including complete blood count, lipid panel, prostate-specific antigen, and cardiovascular risk assessment before initiating testosterone replacement therapy. Regular monitoring during treatment typically includes hematocrit levels every 3-6 months to prevent polycythemia, along with PSA monitoring in men over 40.
=== Legal status === Eflornithine, sold under the brand name Vaniqa, was granted marketing approval by the US FDA, the European Commission among others, is a topical prescription treatment that slows the growth of facial hair. Ornidyl, the injectable form of eflornithine hydrochloride, is licensed by Sanofi-Aventis, and is discontinued in the US. In July 2025, Norgine B.V. withdrew its application in the European Union for a marketing authorization of Ifinwil for the treatment of people with high-risk neuroblastoma (cancer of nerve cells in different parts of the body).
==== Cancer registries ==== Concerned by high breast cancer rates in Vermont, on February 7, 1992, Sanders sponsored the Cancer Registries Amendment Act to establish cancer registries to collect data on cancer. Senator Patrick Leahy introduced a companion bill in the Senate on October 2, 1992. The Senate bill was passed by the House on October 6 and signed into law by President George H. W. Bush on October 24, 1992.
Both doxycycline (DOX) and folic acid were incorporated onto the surface of protein covalently. The very low toxicity of polymer-protein nanoconjugates effectively avoided the high toxicity of DOX, which is expected to not only reduce toxic side effects, but also improve anticancer efficiency in vitro examinations.
== Partition coefficient and log P == The partition coefficient, abbreviated P, is defined as a particular ratio of the concentrations of a solute between the two solvents (a biphase of liquid phases), specifically for un-ionized solutes, and the logarithm of the ratio is thus log P. When one of the solvents is water and the other is a non-polar solvent, then the log P value is a measure of lipophilicity or hydrophobicity. The defined precedent is for the lipophilic and hydrophilic phase types to always be in the numerator and denominator respectively; for example, in a biphasic system of n-octanol (hereafter simply "octanol") and water:
Sources: en.wikipedia.org
AOD-9604 is a synthetic peptide fragment of human growth hormone. It corresponds to the C-terminal region known as hGH 176-191 and is studied for metabolic effects. It is not an approved therapeutic drug.
No. It contains only a small portion of the human growth hormone sequence. The full hormone has 191 amino acids and many additional actions that the fragment does not share.
The name refers to the amino acid positions in the human growth hormone chain. The fragment spans residues 176 through 191 at the C-terminal end. This naming convention helps distinguish it from full-length hGH.
Lyophilized AOD9604 is generally kept at -20 °C or colder, desiccated, and protected from light. Reconstituted solutions are usually refrigerated and handled to minimize repeated freeze-thaw cycles. These are general laboratory handling practices, not instructions for human use.