A practical reference on AOD-9604: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-16. Anything still debated is marked as such rather than presented as settled.
Interest in AOD-9604 arose from attempts to separate metabolic effects from growth effects attributed to hGH. Early work explored whether the fragment could influence lipolysis or fat oxidation without promoting growth. Those questions remain partly unresolved because human data are limited and results have varied across studies. The peptide is not a hormone replacement for hGH and is not equivalent to hGH in clinical use. Its research history includes both laboratory studies and commercial marketing claims that are not the same as regulatory approval.
AOD-9604 is a synthetic peptide whose structure corresponds to a C-terminal segment of human growth hormone. It is often described as hGH fragment 176-191, a 16-amino-acid sequence. The peptide was designed to isolate a region of hGH associated with fat metabolism while avoiding the full hormone's growth-promoting actions. Laboratory and commercial materials typically present it as a lyophilized powder for research use. Its identity is defined by amino acid sequence, not by a single brand.
The fragment includes residues that can form an internal disulfide bond between two cysteine positions. This structural feature can influence how the peptide folds and how stable it is in solution. AOD-9604 differs from full-length hGH in size and receptor interactions; it does not contain the entire growth hormone sequence. Published descriptions sometimes use slightly different residue numbering, so sequence information should be checked against primary sources. The molecule is small compared with intact hGH, which affects analytical detection and purification approaches.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Based on the C-terminal region of human growth hormone. |
| Amino acid length | 16 residues | Often described as hGH fragment 176-191. |
| Appearance | Lyophilized powder | Typically white to off-white; exact appearance depends on grade. |
| Solubility | Soluble in water | Aqueous solubility depends on pH, ionic strength, and preparation. |
| Typical storage | -20 °C or lower | Lyophilized peptide is usually kept cold and dry; solutions may require freezing. |
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.
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.
Das Dentin umschließt wiederum den inneren Teil des Zahns, die Pulpa (Zahnmark), das von Blutgefäßen und Nervenfasern durchzogen wird und den Zahn ernährt. Die Nervenfasern der Oberkieferzähne entstammen dem Nervus infraorbitalis, die der Unterkieferzähne dem Nervus alveolaris inferior. Der Zahn besitzt kein Lymphabflusssystem – mit ein Grund dafür, dass eine Pulpitis („Zahnnerventzündung“) nicht wieder abheilen kann.
Im Wurzelbereich wird das Dentin vom Wurzelzement (neutr.), (Latein: Cementum, seltener: Substantia ossea dentis) bedeckt, der dritten Zahnhartsubstanz neben dem Zahnschmelz und dem Dentin. Das Wurzelzement, das Wurzeldentin als dünne Schicht umschließend, ist im Bereich der Zahnwurzel die äußere Hülle des Zahnes und „mauert“ diese im Kiefer ein. Doch hat die Verbindung zum Kieferknochen, in dem jeder Zahn in seinem Zahnfach (Alveole) aufgehängt ist, eine gewisse Elastizität (siehe Zahnhalteapparat). Unter dem Elektronenmikroskop wird die poröse Oberflächenstruktur der Zahnwurzel sichtbar. Feinste Nervenausläufer überziehen die poröse Oberfläche der Wurzel. Von diesen Nervenausläufern geht die Temperatur- und Berührungssensibilität bei zurückgebildetem Zahnfleisch aus. Das Wurzelzement ist in seiner Struktur wie auch Härte dem menschlichen Knochen ähnlich (Druckfestigkeit 15 kg/mm², Zugfestigkeit 10 kg/mm²). Er gehört bereits zum Zahnhalteapparat, da an ihm die parodontalen Fasern ansetzen, die die Zähne in der Alveole beweglich verankern (Hellwig u. a., 1999b).
Als Wurzelhaut (Syn.: Periodontium) wird das Bindegewebe des Zahnhalteapparates bezeichnet. Diese Sharpey-Fasern, zum Periost gehörende Kollagen-Faserbündel, die in der Knochengrundsubstanz befestigt sind, bilden die Verbindung zum Wurzelzement des Zahnes. An ihnen ist der Zahn federnd befestigt und überbrückt den wenige Zehntel Millimeter breiten Spalt (Periodontalspalt) zwischen dem Zahnzement der Zahnwurzel und der knöchernen Wand des Zahnfachs (Alveole), der Lamina dura. Am Zahnhals wird der Periodontalspalt durch den supraalveolären Faserapparat (frühere Bezeichnung: Ligamentum circulare) abgedichtet.
Der Zahnschmelz entsteht aus dem Ektoderm, der Rest des Zahnes und der Zahnhalteapparat aus dem Mesoderm. In der 5. Entwicklungswoche kommt es (beim Menschen) zur Proliferation des Ektoderms, das in die Tiefe wächst und dort die Zahnleiste bildet. Ektodermale und Mesodermale Wechselwirkungen führen dazu, dass sich aus dem Ektoderm die Anlagen der epithelialen Schmelzorgane und in unmittelbarer Nachbarschaft aus dem Mesenchym die Anlage der Zahnpapille bilden. Die erste Anlage eines Zahns wird als Zahnknospe bezeichnet. Die Theriodontia („Tierzähner“) sind Landwirbeltiere aus der Gruppe der Therapsiden („säugetierähnliche Reptilien“). Zu ihnen gehören drei höher entwickelte, vor allem carnivore Gruppen. Aus einer von ihnen, den Cynodontia, gingen schließlich die Säugetiere hervor. Bei den meisten Säugetieren gibt es einen einmaligen Zahnwechsel (Diphyodontie). Zunächst werden Milchzähne angelegt (lacteale Dentition), die später durch die „zweiten“ oder bleibenden Zähne (permanente Dentition) ersetzt werden. Die Molaren (große Backenzähne) haben keine Milchzahnvorgänger, sie entstehen nur im bleibenden Gebiss. Bei Fischen, Amphibien und Reptilien können die Zähne zeitlebens immer wieder durch neue ersetzt werden (Polyphyodontie). Bekannt sind hierfür z. B. die Zebrabärblinge und das „Revolvergebiss“ der Haie.
Sources: de.wikipedia.org
It is a synthetic peptide based on a C-terminal fragment of human growth hormone. It is commonly referred to as hGH fragment 176-191 and is studied for metabolic effects rather than growth effects.
No. It represents only a short portion of the hGH sequence and lacks the full hormone's structure. As a result, its biological activity and regulatory status differ from those of prescription hGH.
The exact peptide is not typically described as a circulating hormone; it is a synthetic construct based on a natural sequence. Fragments of hGH can exist in laboratory or metabolic contexts, but AOD-9604 itself is manufactured for research.
Reversed-phase HPLC is used to assess purity, and mass spectrometry confirms molecular mass. Amino acid analysis can verify composition. These methods are standard for peptide characterization.