Everything below concerns RP-HPLC. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-08-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 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.
| 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. |
Analytical characterization of AOD-9604 typically employs reversed-phase high-performance liquid chromatography (RP-HPLC) to assess purity and identity. Mass spectrometry provides confirmation of molecular mass, while amino acid analysis can verify composition. These methods are standard for peptide research chemicals. Because the peptide lacks a distinct chromophore, detection often relies on ultraviolet absorbance at 214 nm or mass spectrometric response. Laboratories may also use capillary electrophoresis for separation. For example, size-exclusion chromatography can detect aggregates.
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.
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.
In the 1961 season, he guest-starred in an episode of NBC's Western Bonanza titled "Broken Ballad". In the 1961–1962 season, he guest-starred on ABC's crime drama Target: The Corruptors! and that network's The Rifleman. In the 1962–1963 season, he guest-starred in NBC's modern Western series Empire starring Richard Egan. In 1964, Culp played Charlie Orwell, an alcoholic veterinarian, in an episode of The Virginian (NBC 1962–1971) titled "The Stallion". That same year, he appeared in yet another Western, Gunsmoke. In the series' episode "Hung High", he portrays an outlaw named Joe Costa, who attempts to frame Matt Dillon for lynching a prisoner who had killed the marshal's friend. In 1965, he was cast as Frank Melo in "The Tender Twigs" of James Franciscus's NBC education drama series, Mr. Novak. Culp then played perhaps his most memorable character, American secret agent Kelly Robinson, who operated undercover as a touring tennis professional, for three years on the hit NBC series I Spy (1965–1968), with co-star Bill Cosby. Culp wrote the scripts for seven episodes, one of which he also directed and an episode earned him an Emmy nomination for writing. For all three years of the series, he was also nominated for an acting Emmy (Outstanding Performance by an Actor in a Leading Role in a Dramatic Series category), but lost each time to Cosby.
== Medical uses == Rasburicase is approved for use by the U.S. Food and Drug Administration (and European counterparts) for the prevention and treatment of tumor lysis syndrome (TLS) in people receiving chemotherapy for hematologic cancers such as leukemias and lymphomas. However, it is not clear if it results in important benefits such as decreased kidney problems or decreased risk of death as of 2017. It is being investigated for treating severely high blood levels of uric acid from other sources. For example, it has been used for hyperuricemia in gout, in other rheumatologic conditions, and in rhabdomyolysis with kidney failure.
Liu took an anti-Chiang stance in the Central Plains War, declaring his support for the coalition of Feng Yuxiang, Yan Xishan, and Wang Jingwei in 1930. This stood in contrast to Liu Xiang's more pro-Chiang attitude. Official Chinese sources also claim that Liu supported anti-Nanjing forces such as Hu Ruoyu in Yunnan and Wang Jialie in Guizhou. Nevertheless, this stance was a tepid one and tempered further by pragmatic opportunism; like the rest of his colleagues, Liu refrained from committing his army to the war when a representative of Feng Yuxiang arrived in Sichuan in 1929 to convince the province's warlords to side with the coalition. Once the anti-Chiang side began suffering military defeats, Liu professed his loyalty to the national government in 1931.
Sources: en.wikipedia.org
=== Androgenic and antiandrogenic activity === The binding and activity of progesterone at the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT) in the body, is controversial. Some studies have found progesterone to bind to the AR, with agonistic and antagonistic activity exerted, whereas other studies have found very low or no affinity for the AR at all. In animal studies, no androgenic effects have been observed, but weak antiandrogenic effects have been reported. The weak antiandrogenic activity has been attributed not to antagonism of the AR by progesterone, but rather to its weak 5α-reductase inhibition and consequent inhibition of the conversion of testosterone into the more potent DHT. There is no clinical evidence of AR-mediated androgenic or antiandrogenic activity with progesterone. Progesterone has not been associated with any classical androgenic effects in clinical studies in women, including no changes in the blood lipid profile or sex hormone-binding globulin levels, acne, oily skin, hirsutism, or voice deepening, nor with virilization of female fetuses. As such, the scientific consensus is that progesterone is clinically neither androgenic nor antiandrogenic.
July 20 Blue Origin NS-16: On the 52nd anniversary of the Apollo 11 Moon landing, Jeff Bezos successfully launches the Blue Origin rocket New Shepard 4 in Van Horn, Texas, carrying himself, his brother Mark, 82-year-old retired pilot Wally Funk, and 18-year-old college student Oliver Daemen. The rocket lands back on Earth within minutes, completing the first crewed spaceflight with reusable rockets. Tom Barrack, founder of Colony Capital and an advisor of Donald Trump, is indicted for making false statements to the FBI and being an unregistered agent for the United Arab Emirates. He is found not guilty in 2022. The Milwaukee Bucks defeat the Phoenix Suns (4–2) in the 2021 NBA Finals to win their first championship since 1971. July 21 The 2021 NHL expansion draft is held at Gas Works Park in Seattle, where the 32nd NHL team, the Seattle Kraken fills out its first ever roster of players. Santa Monica based video game publisher Activision Blizzard, Inc. is hit with a massive lawsuit from the California Department of Fair Employment and Housing after a two-year investigation reveals a "frat boy" like work environment where female employees face sexual harassment, discrimination, and retaliation for speaking out against the company. The Tennessee State Building Commission announces that the statue of Nathan Bedford Forrest will be moved from the Tennessee State Capitol to the Tennessee State Museum. The Missouri Supreme Court unanimously upholds a 2020 amendment to the state's constitution that expanded Medicaid eligibility.
Efficiency factor (N) practically measures how sharp component peaks on the chromatogram are, as ratio of the component peak's area ("retention time") relative to the width of the peaks at their widest point (at the baseline). Peaks that are tall, sharp, and relatively narrow indicate that separation method efficiently removed a component from a mixture; high efficiency. Efficiency is very dependent upon the HPLC column and the HPLC method used. Efficiency factor is synonymous with plate number, and the 'number of theoretical plates'. Retention factor (kappa prime) measures how long a component of the mixture stuck to the column, measured by the area under the curve of its peak in a chromatogram (since HPLC chromatograms are a function of time). Each chromatogram peak will have its own retention factor (e.g., kappa1 for the retention factor of the first peak). This factor may be corrected for by the void volume of the column. Separation factor (alpha) is a relative comparison on how well two neighboring components of the mixture were separated (i.e., two neighboring bands on a chromatogram). This factor is defined in terms of a ratio of the retention factors of a pair of neighboring chromatogram peaks, and may also be corrected for by the void volume of the column. The greater the separation factor value is over 1.0, the better the separation, until about 2.0 beyond which an HPLC method is probably not needed for separation.
Sources: en.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.
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.