If you have been reading about hGH fragment 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 2025-11-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| 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 |
=== Unstable isotopes === The suitable half-life and decay mode made lutetium-176 used as a pure beta emitter, using lutetium which has been exposed to neutron activation, and in lutetium–hafnium dating to date meteorites. The isotope 177Lu emits low-energy beta particles and gamma rays and has a half-life around 7 days, positive characteristics for commercial applications, especially in therapeutic nuclear medicine. The synthetic isotope lutetium-177 bound to octreotate (a somatostatin analogue), is used experimentally in targeted radionuclide therapy for neuroendocrine tumors. Lutetium-177 is used as a radionuclide in neuroendocrine tumor therapy and bone pain palliation. Lutetium (177Lu) vipivotide tetraxetan is a therapy for prostate cancer, FDA approved in 2022.
Promising results of health and medical research are reported: non-human vaccinated primates-tested pGal–antigen therapy for suppressing antigen-specific immune responses and against autoimmune diseases, this type of vaccine is called "inverse vaccine" (7 Sep), 3D cell-culture tested exercise-induced hormone irisin against Aβ Alzheimer's disease pathology (8 Sep), identified diverse features strongly associated with long COVID for better diagnosis (25 Sep). Promising innovations relating to global challenges are reported: a study winning an international competition demonstrates an approach that predicted 70% of earthquakes, suggesting some form of earthquake prediction may be feasible in the future (5 Sep), researchers release a large set of audiobooks for books in Project Gutenberg created automatically via generative AI with near-natural voice (7 Sep), a news outlet reports on a natural language system, demonstrated on 27 July, that can provide explanations for the conclusion-making of machine learning models for explainable AI (12 Sep), researchers report a production method for spider silk fibers from gene-edited transgenic silkworms for a sustainable alternative material six times stronger than Kevlar (20 Sep), a new generation of sleeping trains is presented amid a comeback of this transport technology in Europe as demand for more comfortable travel modes than overnight buses and sustainable transport rises (30 Sep).
Homosexual acts are prohibited by law in Ghana. According to a 2013 survey by the Pew Research Center, 96% of Ghanaians believe that homosexuality should not be accepted by society. In 2026 further laws were introduced creating a duty to report homosexual acts and to criminalise "supporters" of LGBTQ+ people. Sometimes elderly women in Ghana are accused of witchcraft, particularly in rural Ghana. Issues of witchcraft mainly remain as speculations based on superstitions within families. In some parts of northern Ghana witch camps exist. These are said to house a total of around 1,000 people accused of and ostracised for witchcraft. The Ghanaian government announced that it intended to close the camps. Over a decade later, in 2023, the Anti-Witchcraft bill passed in parliament, to address accusations and the social impacts of being accused of being a witch, and the president refused to sign it into law. The legislation was reintroduced in 2025.
== Hypothermia == Reduced body temperature, or therapeutic hypothermia, during clinical death slows the rate of injury accumulation, and extends the time period during which clinical death can be survived. The decrease in the rate of injury can be approximated by the Q10 rule, which states that the rate of biochemical reactions decreases by a factor of two for every 10 °C reduction in temperature. As a result, humans can sometimes survive periods of clinical death exceeding one hour at temperatures below 20 °C. The prognosis is improved if clinical death is caused by hypothermia rather than occurring prior to it; in 1999, 29-year-old Swedish woman Anna Bågenholm spent 80 minutes trapped in ice and survived with a near full recovery from a 13.7 °C core body temperature. It is said in emergency medicine that "nobody is dead until they are warm and dead." In animal studies, up to three hours of clinical death can be survived at temperatures near 0 °C.
The first reported protein synthesized by KAHA ligation was human GLP-1 (7-36). Since then, a variety of small proteins (up to 200 residues) have been synthesized, including ubiquitin and other similar modifier proteins, hormone proteins, nitrophorin 4, S100A4 and cyclic proteins. C-terminal ketoacid monomers are pre-loaded on resin via a linker for Fmoc-SPPS (Fmoc-based solid phase peptide synthesis). Initial research utilised sulfur ylide linkers, but more recently the group developed acid- and photo-labile ketoacid monomers that can be loaded directly on Rink Amide resin. The most commonly used N-terminal hydroxylamine is the 5-oxaproline, which results in a homoserine residue after ligation and O-N rearrangement.
Sources: en.wikipedia.org
Abnormal facial characteristics, consisting of pronounced eyes which are spaced far apart (hypertelorism), a high forehead, a compressed bridge of the nose or saddle nose, and a small lower jaw and chin (micrognathia), are also observed in the majority of cases. Those affected by PD can also suffer intellectual disabilities (approx. 75% of recorded cases do) ranging from mild to severe – mental development during childhood may therefore progress more slowly.
== Collagen and accessory proteins == Almost all of the organic (non-mineral) component of bone is dense collagen type I, which forms dense crosslinked ropes that give bone its tensile strength. By mechanisms still unclear, osteoblasts secrete layers of oriented collagen, with the layers parallel to the long axis of the bone alternating with layers at right angles to the long axis of the bone every few micrometers. Defects in collagen type I cause the commonest inherited disorder of bone, called osteogenesis imperfecta. Minor, but important, amounts of small proteins, including osteocalcin and osteopontin, are secreted in bone's organic matrix. Osteocalcin is not expressed at significant concentrations except in bone, and thus osteocalcin is a specific marker for bone matrix synthesis. These proteins link organic and mineral component of bone matrix. The proteins are necessary for maximal matrix strength due to their intermediate localization between mineral and collagen. However, in mice where expression of osteocalcin or osteopontin was eliminated by targeted disruption of the respective genes (knockout mice), accumulation of mineral was not notably affected, indicating that organization of matrix is not significantly related to mineral transport.
Collagen alpha-1(V) chain is a protein that in humans is encoded by the COL5A1 gene. This gene encodes an alpha chain for one of the low abundance fibrillar collagens. Fibrillar collagen molecules are trimers that can be composed of one or more types of alpha chains. Type V collagen is found in tissues containing type I collagen and appears to regulate the assembly of heterotypic fibers composed of both type I and type V collagen. This gene product is closely related to type XI collagen and it is possible that the collagen chains of types V and XI constitute a single collagen type with tissue-specific chain combinations. Mutations in this gene are associated with Ehlers–Danlos syndrome, types I and II.
Wound healing refers to a living organism's replacement of destroyed or damaged tissue by newly produced tissue. In undamaged skin, the epidermis (surface, epithelial layer) and dermis (deeper, connective layer) form a protective barrier against the external environment. When the barrier is broken, a regulated sequence of biochemical events is set into motion to repair the damage. This process is divided into predictable phases: blood clotting (hemostasis), inflammation, tissue growth (cell proliferation), and tissue remodeling (maturation and cell differentiation). Blood clotting may be considered to be part of the inflammation stage instead of a separate stage.
Sheep, lamb and hog casings are available "tubed" where each strand is put on a plastic tube which allows the sausage maker to easily place the casing on the stuffing horn; in recent years these tubes have been modified so they break open along a seam and the operator can pull them out at the back of the horn allowing greater efficiency; these are referred to in the industry as "zip tubes", due to the zipper-like nature of the seam. These tubed casings are then packed in plastic nets, usually two per net, and packed in plastic drums, which are then filled with a saturated salt brine, usually 200 per drum. These are available in all diameters and in lengths greater than 3 meters (as 2-meter or shorter pieces are cost prohibitive to tube). Sheep, lamb, and hog casings are also available loose in brine in a vacuum sealed plastic pack; commonly referred to as "vacuum packs", these are primarily used by small- to medium-sized sausage makers who use less than 100 hanks per month of casing. The appeal of vacuum packs is the ease of use, their shorter strand length for hand stuffing (all sausage makers who do not use automatic sausage stuffing and linking machines) and their shelf life; they only need to be opened as needed so the sausage maker does not need to worry that they will not use their opened casings prior to a decrease in quality. These are available in all diameters and in put ups from short up to medium length, about 6 meter minimum, with a maximum length of about 14 meters. Sheep, lamb and hog casings are also available in a net, commonly referred to as net pack.
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.
No. It is a synthetic peptide fragment modeled on part of human growth hormone, not the full hormone. It does not contain the complete sequence or receptor-binding regions of hGH.