This is a working overview of AOD9604, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-10-05 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | AOD-9604 | Development code used in scientific literature. |
| Chemical class | Synthetic peptide | Fragment of human growth hormone. |
| Amino acid length | 16 residues | Matches hGH region 176-191. |
| Appearance | White to off-white powder | Typical lyophilized peptide solid. |
| Solubility | Soluble in water | Dissolves in aqueous media; exact behavior depends on salt form. |
Magnolia bark has traditionally been used in Eastern medicine as analgesic and to treat anxiety and mood disorders. In traditional Chinese medicine, magnolia bark is called Houpu and is most commonly taken from two species, Magnolia obovata and Magnolia officinalis. Some Chinese traditional formulas containing Houpu include Banxia Houpu Tang (半夏厚朴丸), Xiao Zhengai Tang, Ping Wei San (平胃散) and Shenmi Tang. Japanese Kampo formulas include Hange-koboku-to (半夏厚朴湯) and Sai-boku-to (柴朴湯).
=== Names === Ritanserin is the generic name of the drug and its INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name, and BANTooltip British Approved Name. It is also known by its developmental code name R-55667.
ATAC-seq (Assay for Transposase-Accessible Chromatin using sequencing) is a laboratory technique used in molecular biology to assess genome-wide chromatin accessibility. The technique was introduced in 2013 by the labs of Will Greenleaf and Howard Chang at Stanford University as an alternative to MNase-seq, FAIRE-Seq and DNase-Seq with faster turnaround time, simpler protocol, and lower DNA input requirements.
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In late August 2008, Georgian president Saakashvili said that he expected threat from Abkhazia and had most of the forces stationed near Abkhazia, adding: "if we'd intended to attack, we'd have withdrawn our best-trained forces from Iraq up front." He also said that he had been told in Dubrovnik that Russia would attack Georgia in the summer of 2008. By late August, President Saakashvili said that before the war, he had warned Western leaders (among them U.S. Secretary of State Condoleezza Rice and German Chancellor Angela Merkel) about Russia's intentions to invade Georgia; however his warnings were not taken into account. The Georgian authorities were aware that the United States would not become militarily involved in the conflict with Russia. On 31 August, President Saakashvili told the CNN that he supported neutral international investigation into the causes of the war. He further said that Putin had threatened with the war in the fall of 2006 before the announcement of trade embargo against Georgia. In September 2008, former Russian president Vladimir Putin said the war began during the second half of 7 August and Russian military reached Tskhinvali in two days. Putin accused the United States of encouraging Georgian military attack. He added, "When an aggressor comes into your territory, you need to punch him in the face." Putin claimed there would be a "second blow" into the North Caucasus if Russia had not acted in Georgia.
Chapter 1: Continuous Population Models for Single Species Chapter 2: Discrete Population Models for a Single Species Chapter 3: Models for Interacting Populations Chapter 4: Temperature-Dependent Sex Determination (TSD) Chapter 5: Modelling the Dynamics of Marital Interaction: Divorce Prediction and Marriage Repair Chapter 6: Reaction Kinetics Chapter 7: Biological Oscillators and Switches Chapter 8: BZ Oscillating Reactions Chapter 9: Perturbed and Coupled Oscillators and Black Holes Chapter 10: Dynamics of Infectious Diseases Chapter 11: Reaction Diffusion, Chemotaxis, and Nonlocal Mechanisms Chapter 12: Oscillator-Generated Wave Phenomena Chapter 13: Biological Waves: Single-Species Models Chapter 14: Use and Abuse of Fractals
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== V == Lauri Vaska (1925–2015), Estonian/American chemist Louis Nicolas Vauquelin (1763–1829), French pharmacist and chemist, discovered the elements beryllium and chromium Vincent du Vigneaud (1901–1978), 1955 Nobel Prize in Chemistry Artturi Ilmari Virtanen (1895–1973), chemist, Nobel Prize laureate Max Volmer, Germany (1885–1965) Alessandro Volta (1745–1827), Italian electrochemist, invented the voltaic cell Alexander Vinogradov (1895-1975), Soviet geochemist
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AOD-9604 is a synthetic peptide fragment of human growth hormone. It corresponds to the C-terminal region known as hGH 176-191 and is studied for metabolic effects. It is not an approved therapeutic drug.
No. It contains only a small portion of the human growth hormone sequence. The full hormone has 191 amino acids and many additional actions that the fragment does not share.
The name refers to the amino acid positions in the human growth hormone chain. The fragment spans residues 176 through 191 at the C-terminal end. This naming convention helps distinguish it from full-length hGH.
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.