If you have been reading about regulatory status 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 2025-12-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
Researchers have studied the fragment in cell and animal models to understand its metabolic actions. Some experiments report effects on fat breakdown and fat storage pathways, but the underlying mechanism remains incompletely defined. AOD-9604 does not appear to stimulate the same broad growth hormone receptor signaling as full-length hGH. Whether its observed activities arise from direct receptor interactions or downstream metabolic changes is an open question. Results from different assays are not always consistent.
AOD-9604 is a synthetic peptide modeled on the C-terminal region of human growth hormone. It corresponds to residues 176-191 of the 191-amino-acid hGH sequence. The fragment is not the full hormone and lacks the receptor-binding region associated with growth and metabolic effects of hGH. Researchers developed it to isolate a specific portion of hGH for study. Its exact sequence and length are often stated in peptide catalogs and patents.
Laboratory studies have reported that AOD9604 can increase lipolysis and reduce lipid accumulation in fat cells. The precise molecular target remains uncertain, and the compound does not appear to activate the growth hormone receptor in the same way as full-length hGH. Proposed mechanisms include effects on beta-adrenergic signaling and enzymes involved in fatty acid synthesis, but these pathways are not firmly established. Because most evidence comes from cell and animal models, whether the same effects occur in humans is an open question.
Clinical development of AOD9604 included trials in people with obesity, but the results did not lead to approval as a prescription medicine in major markets. Interest later shifted to research settings and to unapproved products marketed for body composition. Regulatory agencies have questioned whether the peptide qualifies as a dietary ingredient, and some have issued warnings about its presence in supplements. Long-term human safety data are limited, and questions about efficacy, dosing, and target populations remain unresolved.
AOD9604 is a synthetic peptide modeled on the C-terminal region of human growth hormone. It corresponds to a short sequence near the end of the 191-amino-acid hormone, often described as residues 176–191 or a related fragment. Researchers designed it to separate metabolic effects from the growth-promoting actions of full-length growth hormone. Early work in the 1990s explored it as a candidate for weight and lipid disorders. It is not a naturally circulating hormone fragment produced in large amounts.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Derived from a fragment of human growth hormone |
| Sequence basis | hGH residues 176-191 | Commonly described as a 16-amino-acid fragment |
| Appearance | White to off-white powder | Typical for lyophilized research peptides |
| Solubility | Soluble in water or aqueous buffer | Exact solubility depends on pH and purity |
| Common synonyms | AOD9604; hGH 176-191 | Spelling and punctuation vary across sources |
Regulatory status: AOD-9604 is not approved as a therapeutic drug in the United States, European Union, or other major markets. It is listed by the World Anti-Doping Agency as a prohibited substance in sport, specifically under growth hormone fragments. Many jurisdictions restrict its sale for human consumption. Products marketed online may not meet pharmaceutical quality standards. The legal status varies by country and often depends on whether the material is presented as a research chemical, supplement, or drug.
Detection and characterization of AOD-9604 in research and anti-doping settings typically rely on mass spectrometry coupled with liquid chromatography. These methods can identify the peptide by its mass and fragmentation pattern. Immunoassays may also be used in some screening contexts, but they can cross-react with related peptides. Because the molecule is small and may be present at low concentrations, sample preparation and method validation are important. Confirmatory analysis usually requires comparison with a certified reference standard.
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.
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.
=== Chemistry of saturated vs unsaturated acids === The reactivity of saturated fatty acids is usually associated with the carboxylic acid or the adjacent methylene group. By conversion to their acid chlorides, they can be converted to the symmetrical fatty ketone laurone (O=C(CnH(2n+1))2). Treatment with sulfur trioxide gives the α-sulfonic acids. The reactivity of unsaturated fatty acids is often dominated by the site of unsaturation. These reactions are the basis of ozonolysis, hydrogenation, and the iodine number. Ozonolysis (degradation by ozone) is practiced in the production of azelaic acid ((CH2)7(CO2H)2) from oleic acid.
== Controversy == Adrià denounced his fellow 3-star Michelin cook Santi Santamaria who described his approach to cuisine as "pretentious". Traditionalist Santi Santamaria attacked Adrià's dishes in elBulli as unhealthy, alleging that "Adrià's dishes are designed to impress rather than satisfy and used chemicals that actually put diners' health at risk". Top chefs, however, accused Santamaria, who ran the 3-star Can Fabes also in Catalonia, of envy and "endangering the reputations of Spanish kitchens". The criticism has split top Spanish chefs into pro- and anti-Adrià camps. German food writer Jörg Zipprick accused Adrià of more or less poisoning his customers with the additives he uses in his cuisine and said that Adrià's menu should carry health warnings: "These colorants, gelling agents, emulsifiers, acidifiers and taste enhancers that Adrià has introduced massively into his dishes to obtain extraordinary textures, tastes and sensations do not have a neutral impact on health."
=== Effects of the WldS mutation === The mutation causes no harm to the mouse. The only known effect is that the Wallerian degeneration is delayed by up to three weeks on average after injury of a nerve. At first, it was suspected that the Wlds mutation slows down the macrophage infiltration, but recent studies suggest that the mutation protects axons rather than slowing down the macrophages. The process by which the axonal protection is achieved is poorly understood. However, studies suggest that the Wlds mutation leads to increased NMNAT1 activity, which leads to increased NAD+ synthesis. This in turn activates SIRT1-dependent process within the nucleus, causing changes in gene transcription. NAD+ by itself may provide added axonal protection by increasing the axon's energy resources. More recent work, however, raises doubt that either NMNAT1 or NAD+ can substitute for the full length Wlds gene. These authors demonstrated by both in vitro and in vivo methods that the protective effect of overexpression of NMNAT1 or the addition of NAD+ did not protect axons from degeneration. However, later studies showed that NMNAT1 is protective when combined with an axonal targeting peptide, suggesting that the key to the protection provided by WldS was the combination of NMNAT1's activity and the axonal localization provided by the N-terminal domain of the chimeric protein. The provided axonal protection delays the onset of Wallerian degeneration. Schwann cell activation should therefore be delayed, as they would not detect axonal degradation signals from ErbB2 receptors.
transposable element (TE) Also transposon. Any of a diverse variety of selfish mobile genetic elements consisting of self-acting DNA sequences capable of replicating themselves semi-autonomously and inserting into random or specific sites within a host genome, a process known as transposition. Transposons contain one or more genes which encode enzymes known as transposases capable of recognizing sequences within a flanking pair of inverted repeats, such that the enzymes effectively catalyze their own replication, excision, and/or re-insertion into other DNA molecules by any of various mechanisms.
Sources: en.wikipedia.org
=== 11 July === Ukraine seized the Cameroonian-flagged cargo vessel Usko Mfu off the coast of Odesa Oblast and arrested its Azerbaijani captain on suspicion of illegally exporting grain produced in Russian-occupied territories of Ukraine via Sevastopol. On the sidelines of the NATO Washington summit, Australia announced its largest military aid package to Ukraine, consisting of A$250 million worth of ammunition, air defence and guided missiles, anti-tank weapons, and boots for soldiers. It was also announced that the ADF would join the newly established NATO command for Ukraine.
At the fifth year, students break into four core or specialized areas of medical laboratory science, namely: medical microbiology/parasitology, chemical pathology/immunology, haematology/blood transfusion science and histopathology/cytopathology. At the end of the fifth year, suitable students are presented for final professional examination by the Medical Laboratory Science Council of Nigeria.
== Chemistry == Mitragynine pseudoindoxyl was first accessible via biomimetic semisynthesis from mitragynine. Total synthesis of an unnatural analogue was reported featuring an interrupted Ugi reaction as the key step. Scalable and modular total synthesis of the natural product has also been accomplished using a chiral pool based strategy. This study also demonstrated structural plasticity in biological systems.
Sources: en.wikipedia.org
No, it is a synthetic peptide fragment corresponding to a small portion of hGH. It is not the full 191-amino-acid hormone and does not reproduce all of hGH's effects.
It is commonly described as a 16-amino-acid peptide based on residues 176-191 of human growth hormone. Some sources vary in notation, so checking the stated sequence is useful.
It is not typically described as a standalone natural hormone. The sequence is derived from the C-terminal region of human growth hormone, but the synthetic peptide is a laboratory-made construct.
AOD9604 is a synthetic peptide based on a C-terminal segment of human growth hormone. It is manufactured by chemical peptide synthesis rather than extracted from human tissue. The sequence is often described as hGH fragment 176–191 or a close variant.