The short version of AOD-9604 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized form; may appear as cake |
| Solubility class | Water-soluble | Often reconstituted in aqueous buffer |
| Typical storage temperature | −20 °C or below | Protect from light and moisture |
| Typical analytical method | RP-HPLC and mass spectrometry | Used for purity and identity |
| Common synonyms | AOD-9604; AOD9604; hGH fragment 176-191 | Research name and fragment description |
A central uncertainty is whether observed metabolic changes translate into meaningful clinical benefits. Study designs vary in dose, duration, and participant characteristics, making comparisons difficult. Independent replication is limited, and the field lacks consensus on optimal endpoints or treatment duration. Ongoing or future studies may clarify mechanism and effect size, but current evidence does not establish a clear therapeutic role. Researchers often call for larger, longer, and better-controlled trials, while questions remain about which patient groups might respond.
Proposed mechanism focuses on lipolysis, the breakdown of stored triglycerides into free fatty acids and glycerol. AOD-9604 is thought to act on adipose tissue without stimulating appetite or affecting blood sugar in the same way as growth hormone. Laboratory studies report increased fat oxidation in some models. The precise receptor interactions and signaling pathways remain incompletely characterized. Researchers have proposed that the peptide may influence fat mobilization through pathways distinct from the full hormone.
Research has examined whether the peptide affects fat mass independently of growth hormone's other actions. Early animal studies suggested reductions in body fat, but species differences and small sample sizes limit interpretation. Human studies have generally been short and have not consistently shown large effects. Some trials measured body composition, lipid profiles, and safety parameters, but the overall picture is one of suggestive yet inconclusive metabolic activity. Findings vary across study populations and protocols.
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.
== Structure and conformation == These cyclic dipeptides incorporate both donor and acceptor groups for hydrogen bonding. They are conformationally constrained nearly planar scaffolds. Diversity can be introduced at up to six positions and stereochemistry controlled at up to four positions. They are stable to proteolysis. These characteristics underpin theis biologically activity and utility in medicinal chemistry. As a consequence of their predominant biosynthetic origin from L-α-amino acids most naturally occurring 2,5-DKPs are cis configured as the cyclo(L-Xaa-L-Yaa) isomers. 2,5-DKPs epimerize under basic, acidic and thermal conditions. The composition of the cis and trans isomers in the equilibrium state varies widely depending on the bulk of the side chains, if a ring (e.g. proline) is present, or if the nitrogen atoms are alkylated . Although epimerization was historically an issue in the synthesis of 2,5-DKPs, several mild methods have been developed recently that avoid epimerization.
The C-terminal domain has structural similarities to the serum protein hemopexin. It has a four-bladed β-propeller structure. β-Propeller structures provide a large flat surface that is thought to be involved in protein-protein interactions. This determines substrate specificity and is the site for interaction with TIMP's (tissue inhibitor of metalloproteinases). The hemopexin-like domain is absent in MMP-7, MMP-23, MMP-26, and the plant and nematode. The membrane-bound MMPs (MT-MMPs) are anchored to the plasma membrane via a transmembrane or a GPI-anchoring domain.
=== Animal rights === Barker was a vegetarian. In 1982, Barker began ending The Price Is Right episodes with the phrase: "This is Bob Barker reminding you to help control the pet population – have your pets spayed or neutered." Though Barker had already been dabbling in animal rights before meeting Burnet, his efforts became more aggressive during his relationship with her. In 1987, Barker requested the removal of fur prizes for the Miss USA pageant and stepped down as host when the producers refused. In 1989, Barker and United Activists for Animal Rights publicly accused several media projects and the American Humane Association of animal mistreatment and condoning animal mistreatment, a tactic which resulted in a $10 million suit against him and the UAAR for libel, slander, and invasion of privacy. The suit was finally settled by the insurer in 1994. Barker founded DJ&T Foundation in 1994, named after his late wife and mother, which has contributed millions of dollars to animal-neutering programs and funded animal rescue and park facilities all over the United States. In 2004, Barker donated $1 million (equivalent to $1.7 million in 2025) to Columbia Law School to support the study of animal rights. In 2009, Barker wrote a letter about three businesses in Cherokee, North Carolina, asking them to close their bear exhibits. He threatened to not attend the 2009 Game Show Awards, where Barker was to receive a lifetime achievement award, because Betty White would be attending.
Collagen alpha-4(IV) chain is a protein that in humans is encoded by the COL4A4 gene. This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. This particular collagen IV subunit, however, is only found in a subset of basement membranes. Like the other members of the type IV collagen gene family, this gene is organized in a head-to-head conformation with another type IV collagen gene so that each gene pair shares a common promoter. Mutations in this gene are associated with type II autosomal recessive Alport syndrome (hereditary glomerulonephropathy) and with familial benign hematuria (thin basement membrane disease). Two transcripts, differing only in their transcription start sites, have been identified for this gene and, as is common for collagen genes, multiple polyadenylation sites are found in the 3' UTR.
Sources: en.wikipedia.org
Neoepitopes of Type V collagen have shown to be a useful noninvasive serum biomarker for assessing fibrotic progression and resolution in experimental hepatic fibrosis. Type V Collagens isoform which contains the α3(V) chain is involved in mediating pancreatic islet cell functions. Type V Collagens will arrange with Type I Collagen and form heterotypic fibrils in the skin dermis and cornea. Together, Collagen V and Collagen I acts as a dominant regulator of collagen fibrillogenesis. Type V Collagens interacts with matrix collagens and structural proteins. This interaction improves structural integrity to tissue scaffolds. Harmful roles that Type V collagen can play in the body.
=== Development === In 2000, Danny McBride met Len Wiseman through Nick Reed, who was the agent for both of them with intent for them to work together on a script the former wrote. While the plans for that film fizzled out, they did set out a plan to work together. Kevin Grevioux had graduated from Howard University with a degree in microbiology, but he developed a desire to study film in cinematography and screenwriting. He dropped out of graduate studies and moved to Los Angeles, where he became an actor. He came up with the original concept for the film and wrote the original screenplay, which was inspired by Romeo and Juliet alongside his college studies, which based vampirism and lycanthropy on a viral mutagen rather than mythology. McBride and Wiseman soon stepped in to work on the script, which they soon set out to make a trilogy of films. Each received credit for their work on the film, and Grevioux also appeared in the film as an actor.
Most rattlesnake species mate during the summer or fall, while some species mate only in the spring, or during both the spring and fall. Females secrete small amounts of sex pheromones, which leave a trail the males follow using their tongues and Jacobson's organs as guides. Once a receptive female has been located, the male often spends several days following her around (a behavior not common outside of the mating season), frequently touching and rubbing her in an attempt to stimulate her. The males of some species, such as timber rattlesnakes (C. horridus), fight each other during the mating season, in competition over females. These fights, known as "combat dances", consist of the two males intertwining the anterior portion of their bodies, often with their heads and necks held vertically. The larger males usually end up driving the smaller males away. Although many kinds of snakes and other reptiles are oviparous (lay eggs), rattlesnakes are ovoviviparous (give birth to live young after carrying eggs inside). The female produces the ova ("eggs") in her ovaries, after which they pass through her body cavity and into one of her two oviducts. The ova are arranged in a continuous chain in a coiled section of the oviduct, known as the "tuba". Male rattlesnakes have sexual organs known as hemipenes, located in the base of the tail. The hemipenis is retracted inside of the body when mating is not occurring. The hemipenis is similar to the human penis.
Liu Wenhui entered the Xikang area with around ten to twenty thousand troops of the 24th Army at his disposal, equipped with automatic weapons, mortars, and artillery. The size and strength of Liu's remaining forces, even in this diminished state, gave him much authority in dealing with local elites and in pacifying the province. To strengthen control over the local tusi of Kham, Liu ordered from 1932 onwards that all local tribal soldiers be integrated directly into the 24th Army, a measure that reportedly maintained peace in the region.
production of the drug(s) or device(s) being evaluated staff salaries for the designers and administrators of the trial payments to the contract research organization, the site management organization (if used) and any outside consultants payments to local researchers and their staff for their time and effort in recruiting test subjects and collecting data for the sponsor the cost of study materials and the charges incurred to ship them communication with the local researchers, including on-site monitoring by the CRO before and (in some cases) multiple times during the study one or more investigator training meetings expense incurred by the local researchers, such as pharmacy fees, IRB fees and postage any payments to subjects enrolled in the trial the expense of treating a test subject who develops a medical condition caused by the study drug These expenses are incurred over several years. In the US, sponsors may receive a 50 percent tax credit for clinical trials conducted on drugs being developed for the treatment of orphan diseases. National health agencies, such as the US National Institutes of Health, offer grants to investigators who design clinical trials that attempt to answer research questions of interest to the agency. In these cases, the investigator who writes the grant and administers the study acts as the sponsor, and coordinates data collection from any other sites. These other sites may or may not be paid for participating in the study, depending on the amount of the grant and the amount of effort expected from them.
Sources: en.wikipedia.org
Lyophilized powder is commonly stored at −20 °C or below, protected from light and moisture. Reconstituted solutions are typically kept refrigerated and used within a limited period.
Reversed-phase HPLC and mass spectrometry are standard checks. They confirm peptide purity and molecular mass, but they do not by themselves demonstrate biological activity.
Synthesis, purification, and handling conditions can differ, leading to variations in purity and salt content. Certificates of analysis help, but independent testing is often needed for verification.
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.