If you have been reading about peptide 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 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
AOD-9604 is a synthetic peptide whose sequence matches the C-terminal fragment of human growth hormone, specifically residues 176 through 191. This region differs from the full hormone in its receptor interactions. The peptide is not a growth hormone secretagogue and does not bind the growth hormone receptor in the same manner. Researchers have examined it for effects on lipid metabolism, but its exact pharmacological profile remains an active area of study.
Development of AOD-9604 began in the 1990s as scientists sought to isolate metabolic effects of growth hormone without its growth-promoting actions. Early laboratory work focused on fat cells and animal models. Several human trials followed, examining changes in body composition and fat mass. Results have been mixed, and the peptide has not progressed to widespread clinical approval. Interest continues in research settings, particularly regarding its mechanism and potential metabolic targets.
Regulatory status varies by country. In the United States, AOD-9604 is not approved as a prescription drug. It is sometimes sold as a research chemical or dietary supplement, though such marketing may fall outside legal frameworks. The World Anti-Doping Agency prohibits its use in sport. Researchers must obtain it through legitimate suppliers and follow institutional rules. Its legal classification continues to evolve as authorities increasingly assess peptide products more broadly.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Peptide fragment | Corresponds to hGH residues 176-191 |
| Common synonyms | AOD9604, hGH 176-191 | Also written as AOD-9604 |
| Typical form | Lyophilized powder | Often supplied in sealed vials |
| Solubility | Water-soluble | Dissolves in aqueous buffers |
| Regulatory status | Not approved as drug | Banned in sport; varies by country |
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.
The peptide is frequently described as a growth hormone fragment, although it is chemically distinct from full-length hGH. AOD-9604 contains 16 amino acids and includes two cysteine residues that can form an intramolecular disulfide bond. In solution, this structural feature can influence folding, aggregation, and stability. Published descriptions sometimes call it hGH 176-191 or AOD9604, with spacing and capitalization varying. Such naming differences can complicate literature searches, database entries, and product verification.
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.
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.
Regulatory treatment of AOD-9604 is shaped by its classification as a peptide hormone. The World Anti-Doping Agency lists it as a prohibited substance, and many national anti-doping organizations adopt that list. It does not hold approval as a prescription medicine in the United States, the European Union, or other major markets. Products sold online are frequently labeled for research use only and may not undergo independent quality testing. Import and possession rules differ by country, so legal status depends on local law.
A coroner's inquest into the deaths of Lancashire couple John and Susan Cooper, who died while on holiday in Egypt in August 2018, concludes their deaths occurred as a result of carbon monoxide poisoning brought about by the use of a substance containing dichloromethane to kill bed bugs in an adjoining hotel room. 13 November – Police confirm that three children are among five members of the same family to have been killed in a house fire in London the previous day. A sixth person subsequently dies in hospital a few days later. 14 November – Around 400 are evacuated from Barton House, the oldest tower block in Bristol, after a survey carried out by Bristol City Council identified structural and fire safety concerns with the building. 16 November – The Department for Education asks the exams regulator, Ofqual, to extend extra support for GCSE students in England for another year as a way to help against the impact of COVID-19 on students taking examinations. Convicted murderer Ron Evans, 82, also known as the Clifton Rapist, is sentenced to four years in prison after he was earlier convicted of sexually assaulting a woman he met at a community centre. Cumbria Police confirm that a 16-year-old boy arrested in connection with the felling of the Sycamore Gap tree will face no further action. Two 12-year-old boys are charged with the murder of 19-year-old Shawn Seesahai, who was fatally stabbed in Wolverhampton three days earlier.
These immobilized CSP are much more rugged and the "non-standard" solvents can be employed. Thus expanding the choice of co-solvent. The major strength of immobilized CSPs are high solvent versatility in selection of mobile phase composition, enhanced sample solubility, high selectivity, robustness and extended durability, excellent column efficiency, and broad application domain in the resolution of enantiomers. Solvent is a key factor in HPLC MD. More solvents to play with means better sample solubility, Improves resolution, and enables effective chiral method development.
In 1946, the Atomic Bomb Casualty Commission (ABCC) was established by the National Research Council of the National Academy of Sciences by order of U.S. President Harry S. Truman to study the long-term effects of radiation on survivors of the atomic bombings. In 1975, the ABCC was replaced by the Radiation Effects Research Foundation (RERF). Organizations such as the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), founded in 1955, and the National Academy of Sciences - Advisory Committee on the Biological Effects of Ionizing Radiation (BEIR Committee), founded in 1972, analyze the effects of radiation exposure on humans on the basis of atomic bomb victims who have been examined and, in some cases, medically monitored for decades. They determine the course of the mortality rate as a function of the age of the radiation victims in comparison with the spontaneous rate, and also the dose-dependency of the number of additional deaths. To date, 26 UNSCEAR reports have been published and are available online, most recently in 2017 on the effects of the Fukushima nuclear accident. By 1949, Americans felt increasingly threatened by the possibility of nuclear war with the Soviet Union and sought ways to survive a nuclear attack. The U.S. Federal Civil Defense Administration (USFCDA) was created by the government to educate the public on how to prepare for such an attack. In 1951, with the help of this agency, a children's educational film was produced in the U.S.
== Life == Roderich Süssmuth studied chemistry and biochemistry at the Eberhard Karls University of Tübingen from 1990 to 1996. In 1999, he received his doctorate under Günther Jung in Tübingen with a dissertation entitled Isolation, structural elucidation, and synthesis of microbial metabolites from Amycolatopsis mediterranei, Staphylococcus epidermidis, and Streptomyces lividans. During a postdoctoral stay at the Scripps Research Institute in La Jolla, California, United States, from 2000 to 2001, he worked with Richard A. Lerner and Carlos F. Barbas on catalytic antibodies and organocatalysis. As an Emmy Noether Research Fellow (DFG) from 2001 to 2004, he completed his habilitation in chemistry and biochemistry at the University of Tübingen. In 2004, he was appointed Associate Professor of Biological Chemistry at TU Berlin. In 2008, he was appointed to the Rudolf Wiechert Professorship of Biological Chemistry at TU Berlin. In 2020, he was named a Fellow of the Royal Society of Chemistry (FRSC) and an honorary member of the Israel Chemical Society. In 2022, he was admitted to the Confraternity of Santa Maria dell'Anima in Rome.
Sources: en.wikipedia.org
=== Effects on longevity === mTOR, specifically mTORC1, was first shown to be important in aging in 2003, in a study on worms; sirolimus was shown to inhibit and slow aging in worms, yeast, and flies, and then to improve the condition of mouse models of various diseases of aging. Sirolimus was first shown to extend lifespan in wild-type mice in a study published by NIH investigators in 2009; the studies have been replicated in mice of many different genetic backgrounds. A study published in 2020 found late-life sirolimus dosing schedules enhanced mouse lifespan in a sex-specific manner: limited rapamycin exposure enhanced male but not female lifespan, providing evidence for sex differences in sirolimus response. The results are further supported by the finding that genetically modified mice with impaired mTORC1 signalling live longer. Sirolimus has potential for widespread use as a longevity-promoting drug, with evidence pointing to its ability to prevent age-associated decline of cognitive and physical health. In 2014, researchers at Novartis showed that a related compound, everolimus, increased elderly patients' immune response on an intermittent dose. This led to many in the anti-aging community self-experimenting with the compound. However, because of the different biochemical properties of sirolimus, the dosing is potentially very different from that of everolimus.
=== Landmine removal === Thiokol has used surplus rocket fuel through an agreement with NASA's Marshall Space Flight Center to produce a flare that can safely destroy landmines. The fuel that is left unused from a launch will become a solid, which cannot be reused but can be used as an ingredient needed to create the Demining Device flare. The Demining Device flare uses a battery-triggered electric match to ignite and neutralize land mines in the field without detonation. The flare uses the solid rocket fuel to burn a hole in a mine's case and burns away the explosive contents so the mine can be disarmed without hazard.
It is believed the first tulips in the United States were grown near Spring Pond at the Fay Estate in Lynn and Salem, Massachusetts. From 1847 to 1865, Richard Sullivan Fay, Esq., one of Lynn's wealthiest men, settled on 2 km2 (200 ha; 500 acres) located partly in present-day Lynn and partly in present-day Salem. Mr. Fay imported many different trees and plants from all parts of the world and planted them among the meadows of the Fay Estate.
Sources: en.wikipedia.org
== What does it deliver? == DNA extraction is frequently a preliminary step in many diagnostic procedures used to identify environmental viruses and bacteria and diagnose illnesses and hereditary diseases. These methods consist of, but are not limited to: Fluorescence In Situ Hybridization (FISH) technique was developed in the 1980s. The basic idea is to use a nucleic acid probe to hybridize nuclear DNA from either interphase cells or metaphase chromosomes attached to a microscopic slide. It is a molecular method used, among other things, to recognize and count particular bacterial groupings. To recognize, define, and quantify the geographical and temporal patterns in marine bacterioplankton communities, researchers employ a technique called terminal restriction fragment length polymorphism (T-RFLP). Sequencing: Whole or partial genomes and other chromosomal components, ended for comparison with previously published sequences.
Creatine ( or ) is an organic compound that facilitates recycling of adenosine triphosphate (ATP) in vertebrates, primarily in their muscle and brain tissue. It is a popular dietary supplement. Its phosphorylated form, phosphocreatine, donates phosphate groups to adenosine diphosphate (ADP), turning it back into ATP. Creatine also acts as a buffer. It has the nominal formula (H2N)(HN)CN(CH3)CH2CO2H. In solutions, it exists in various tautomers, including a neutral form and zwitterionic forms.
1,4-Butanediol, also called butane-1,4-diol (other names include 1,4-B, BD, dose, BDO, and 1,4-BD), is a primary alcohol and an organic compound with the formula HOCH2CH2CH2CH2OH. It is a colorless viscous liquid first synthesized in 1890 via acidic hydrolysis of N,N'-dinitro-1,4-butanediamine by Dutch chemist Pieter Johannes Dekkers, who called it "tetramethylene glycol".
Sources: en.wikipedia.org
AOD-9604 is a synthetic peptide fragment of human growth hormone, corresponding to amino acids 176-191. It is studied for potential effects on fat metabolism, but it is not approved as a drug in most countries. Its exact mechanism remains under investigation.
No, it is a small fragment of the full growth hormone protein. It does not appear to stimulate growth or increase growth hormone levels in the same way. Its actions are thought to be more limited to metabolic pathways.
Regulatory status varies. It is not approved for medical use in the United States or many other countries. It is banned in sport by WADA, and its sale as a supplement or research chemical may be subject to legal restrictions.
It is proposed to promote lipolysis in fat tissue, the breakdown of stored fat into fatty acids and glycerol. The detailed receptor and signaling mechanisms are not fully established.