GHRH analog comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
Verification matters because research peptides vary widely in quality. A certificate of analysis is only as reliable as the method behind it, and a single chromatographic trace reveals little about counter-ions, residual solvents, or water content. Independent laboratories commonly pair mass confirmation with chromatographic purity and, where relevant, quantify water along with acetate or trifluoroacetate content. Reported purity figures are not standardized across suppliers, so a stated value such as ninety-eight percent is not directly comparable unless the analytical method, column, and detection wavelength accompany it.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
The peptide backbone corresponds to GRF(1-29), the first 29 residues of native growth hormone-releasing hormone, which retains most of the receptor-activating activity of the full-length molecule. Four substitutions distinguish the analog from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes slow cleavage by dipeptidyl peptidase IV, the enzyme that degrades native hormone in plasma within minutes. The outcome is improved enzymatic stability combined with a still brief residence time when no additional modification is present.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Assessed by visual inspection under ordinary light |
| Primary analytical method | Reversed-phase liquid chromatography | Purity estimated from peak area at 214 nm |
| Confirmatory method | Mass spectrometry | Observed mass compared with calculated value |
| Powder storage temperature | Minus 20 degrees Celsius | Minus 80 for extended archival periods |
| Solution stability | Hours to days at 2 to 8 degrees Celsius | Influenced by pH, buffer, and concentration |
Research material is normally supplied as a freeze-dried powder in sealed vials. In that state the peptide is comparatively robust, but prolonged exposure to warmth, moisture, or light accelerates degradation. Storage at minus twenty degrees Celsius or lower, with desiccant and protection from light, is the commonly described practice. Vials should be allowed to reach room temperature before opening to limit condensation on the powder. Moisture uptake during handling is a recognized source of variability in later measurements.
Reconstitution is typically performed with sterile water or bacteriostatic water, added slowly against the vial wall. The resulting solution should be clear and colorless; cloudiness or visible particles suggest a problem with the material or the diluent. Once in solution, the peptide is less stable than the dry powder. Refrigerated storage at two to eight degrees Celsius is common for short-term holding, while freezing aliquots is described for longer periods.
Purity is most often assessed by reversed-phase high-performance liquid chromatography, reported as a percentage of total peak area. Identity is confirmed by mass spectrometry, which yields a molecular ion consistent with the expected sequence. Amino acid analysis and peptide mapping provide additional characterization. Reported purity values are method-dependent, so figures from different laboratories are not always directly comparable without details of column, gradient, and detection wavelength.
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
Identity and purity are established with reversed phase high performance liquid chromatography coupled to mass spectrometry. The chromatographic step separates the target peptide from truncated sequences and deletion products, while the mass measurement confirms the expected molecular weight to within a fraction of a dalton. Because the two common variants differ by the presence of the linker, mass alone can distinguish them in the unconjugated state. Amino acid analysis and peptide mapping are used when sequence level confirmation is required.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
== History == Selenium sulfide was introduced for medical use in the United States in 1951. Selenium monosulfide, along with elemental selenium and sulfur, has been used in medicinal preparations in the past, causing confusion and contradiction as to exactly what form selenium is in any given topical preparation.
In Germany, dimethyl fumarate is marketed for the treatment of psoriasis and is available as an oral formulation mixed with related compounds (Fumaderm); in the UK, it is available as a pure oral formulation (Skilarence). It is also available in the US as an oral formulation (Tecfidera) to treat adults with relapsing multiple sclerosis. A 2015 Cochrane systematic review found moderate quality evidence of a reduction in the number of people with relapsing remitting MS that had relapses over a two-year treatment period with dimethyl fumarate versus placebo, as well as low quality evidence of a reduction in worsening disability, and an overall need for higher quality studies with longer follow-up.
=== Associated illnesses === Polymyositis and the associated inflammatory myopathies have an associated increased risk of cancer. The features they found associated with an increased risk of cancer were older age, age greater than 45, male sex, difficulty swallowing, death of skin cells, cutaneous vasculitis, rapid onset of myositis (<4 weeks), elevated creatine kinase, higher erythrocyte sedimentation rate and higher C-reactive protein levels. Several factors were associated with lower-than-average risk, including the presence of interstitial lung disease, joint inflammation/joint pain, Raynaud's syndrome, or anti-Jo-1 antibody. The malignancies that are associated are nasopharyngeal cancer, lung cancer, non-Hodgkin's lymphoma and bladder cancer, amongst others. Cardiac involvement manifests itself typically as heart failure and is present in up to 77% of patients. Interstitial lung disease is found in up to 65% of patients with polymyositis, as defined by HRCT or restrictive ventilatory defects compatible with interstitial lung disease.
=== Gas === Although nitrogen is non-toxic, when released into an enclosed space it can displace oxygen, and therefore presents an asphyxiation hazard. This may happen with few warning symptoms, since the human carotid body is a relatively poor and slow low-oxygen (hypoxia) sensing system. An example occurred shortly before the launch of the first Space Shuttle mission on March 19, 1981, when two technicians died from asphyxiation after they walked into a space located in the Space Shuttle's mobile launcher platform that was pressurised with pure nitrogen as a precaution against fire. When inhaled at high partial pressures (more than about 4 bar, encountered at depths below about 30 m in scuba diving), nitrogen is an anaesthetic agent, causing nitrogen narcosis, a temporary state of mental impairment similar to nitrous oxide intoxication. Nitrogen dissolves in the blood and body fats. Rapid decompression (as when divers ascend too quickly or astronauts decompress too quickly from cabin pressure to spacesuit pressure) can lead to a potentially fatal condition called decompression sickness (formerly known as caisson sickness or the bends), when nitrogen bubbles form in the bloodstream, nerves, joints, and other sensitive or vital areas. Bubbles from other "inert" gases (gases other than carbon dioxide and oxygen) cause the same effects, so replacement of nitrogen in breathing gases may prevent nitrogen narcosis, but does not prevent decompression sickness.
At Alan Gross's espionage trial in 2011, the Cuban government prosecutors alleged that Alan Gross was running a secret program for USAID called the "Cuba democracy program." The prosecution said that Gross had been coordinating with Akram Elias about this project, and at their meeting in December 2009, they discussed extending USAID's development program into Freemasonry in Cuba. The prosecution also presented evidence at the trial of two flash drives that contained material relating to projects "against the Cuban state." In 2004, they alleged that Alan Gross smuggled a video camera to Grand Master José Manuel Collera Vento, which originated from the office of Marc Wachtenheim. That office, they pointed out, was a block away from the White House. In 2011, Grand Master Collera Venta went on a series of Cuban television broadcasts called Las Razones de Cuba, in which he publicly admitted that he had been working for the Cuban government as a counterintelligence officer his entire life, and that he had only been planted as Grand Master so that the Cuban government could monitor Freemasons. On April 1, 2011, the Cuban government awarded José Manuel Collera Vento with the Escudo Pinareño (English: Shield of Pinar del Rio), the highest award of the Provincial Assembly of People's Power in Pinar del Río. This was awarded for his services to the state. Exiled Cuban Freemasons called this a betrayal of the institution of Freemasonry itself.
Sources: en.wikipedia.org
Alternatively, a chief resident may describe a resident who has been selected to extend his or her residency by one year and organize the activities and training of the other residents (typically in internal medicine and pediatrics). If a physician finishes a residency and decides to further his or her education in a fellowship, they are referred to as a "fellow". Physicians who have fully completed their training in a particular field are referred to as attending physicians, or consultants (in Commonwealth countries). However, the above nomenclature applies only in educational institutes in which the period of training is specified in advance. In privately owned, non-training hospitals, in certain countries, the above terminology may reflect the level of responsibility held by a physician rather than their level of education.
==== Cough ==== Codeine was once viewed as the "gold standard" in cough suppressants, but this position has since been questioned. Some recent placebo-controlled trials have found that it may be no better than a placebo for some causes including acute cough in children. As a consequence, it is not recommended for children. Additionally, there is no evidence that hydrocodone is useful in children. Similarly, a 2012 Dutch guideline regarding the treatment of acute cough does not recommend its use. Low dose morphine may help chronic cough but its use is limited by side effects.
== External links == "Moxetumomab Pasudotox-tdfk". National Cancer Institute. 24 October 2018. Archived from the original on 19 October 2021. Retrieved 11 October 2020. "Moxetumomab Pasudotox-tdfk". NCI Drug Dictionary. National Cancer Institute.
== For transgender older adults == Transgender older adults can encounter challenges in the access and quality of care received in health care systems and nursing homes, where providers may be ill-prepared to provide culturally sensitive care to trans people. Trans individuals face the risk of aging with more limited support and in more stigmatizing environments than heteronormative individuals. Despite the rather negative picture portrayed by medical literature in relation to the depression and isolation that many transgender people encounter at earlier stages of life, some studies found testimonies of older LGBTQ adults relating feelings of inclusion, comfort and community support. For transgender older adults seeking gender-affirming hormonal therapy, data on the health impacts of masculinizing and feminizing therapies in the older population is limited. Testosterone and estrogen levels reduce with age, and sex hormone levels and advanced age have each been identified as risk factors for cancers, cardiovascular disease, and other disease states. Further investigation is needed to assess the risks and benefits of GAHT in older adults.
=== Tourism === Areas where white sharks gather have been sites for ecotourism; operators offer guest viewing from boats or from underwater shark cages. Most operators use chum to attract the sharks to the vessels. Proponents argue that these tours provide public education, fund research, and increase the economic value of living sharks relative to fishing. A study in South Australia found that these encounters improved participants' knowledge and support for shark conservation. However, concerns persist regarding the impact of tourist interactions on shark behavior. At the Neptune Islands, researchers found that white sharks expended more energy during encounters with cage divers, but suggested population-level impacts are negligible if the frequency of encounters with any single shark is minimal. While intensive boat activity initially drove sharks away from the area, the population recovered following 2012 regulations that restricted the number of licensed operators and their days of operation. There is no strong evidence that chumming alters the feeding behavior of white sharks or conditions them to associate humans with food. The Mexican government banned white shark tourism at Guadalupe Island in January 2023. This decision followed reports of safety violations—such as swimming outside cages and improper chum handling—along with two incidents where sharks were harmed after being caught between the bars of the cages.
Sources: en.wikipedia.org
Mass spectrometry establishes whether the observed molecular weight matches the calculated sequence mass. Chromatographic retention and fragment mapping add further confidence about sequence and composition. A single technique alone is rarely treated as sufficient evidence of identity.
Dry powder is markedly more stable than solution and is usually held frozen and desiccated. Room temperature exposure over days degrades it more slowly than most people assume, but long-term integrity favors freezer storage. Light protection is recommended regardless of temperature.
Methods, columns, gradients, and detection wavelengths are not standardized across laboratories. Some figures describe only the main peak area at one wavelength and ignore water, salts, or counter-ions. Without stated conditions, comparing reported percentages across sources is unreliable.
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.