CJC-1295 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
Two related peptides circulate under the CJC-1295 label, and they differ mainly in how long they persist in circulation. The version carrying a drug affinity complex includes a maleimidopropionic acid linker that forms a covalent bond with serum albumin. The other version, usually written as modified GRF(1-29) or tetrasubstituted GRF(1-29), lacks that linker and is cleared quickly. Mixing the two produces inconsistent readings of published half-life values, because the linker rather than the receptor-facing sequence drives most of the difference.
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | GHRH receptor agonist |
| Sequence length | 29 amino acids | Derived from human GHRH |
| Molecular weight | About 3368 Da without linker | Albumin-binding form is heavier |
| Appearance | White to off-white lyophilized powder | Common form for research reference material |
| Typical storage | -20 °C or below, desiccated | Protect powder from light and moisture |
CJC-1295 is a synthetic peptide designed to mimic growth hormone-releasing hormone (GHRH), the endogenous signal that prompts the pituitary gland to release growth hormone. The compound is a modified fragment of the natural hormone, spanning the first twenty-nine amino acids of GHRH with several substitutions that slow enzymatic breakdown. Two variants circulate in research settings: one carrying a drug affinity complex (DAC) and one without it. The DAC-free form is frequently labelled Mod GRF(1-29) in catalogs and discussion forums.
The peptide binds GHRH receptors on somatotroph cells within the anterior pituitary, triggering a signalling cascade that increases growth hormone secretion. Its improved resistance to dipeptidyl peptidase IV degradation distinguishes it from the parent hormone. In the DAC-bearing version, a maleimide group reacts with a cysteine residue on serum albumin, forming a covalent bond that keeps the peptide in circulation far longer. That albumin attachment is the central design feature separating the two research variants.
Pharmacokinetic behaviour differs sharply between the two forms. The DAC-bearing peptide shows an extended circulation time measured in days, whereas the version without the complex is cleared within roughly half an hour. This gap shapes how researchers design dosing schedules in animal models. Whether the prolonged presence of the DAC form produces effects meaningfully different from the short-acting variant remains an open question, since comparative human data are scarce.
Peptide degradation proceeds mainly through hydrolysis, oxidation of methionine, and deamidation of asparagine or glutamine residues. The maleimide group on the albumin-binding variant can also react with thiols or hydrolyze in aqueous media. Because these pathways accelerate with temperature and pH extremes, handling conditions strongly influence measured stability. Stability data in the public literature are limited and often generated under differing conditions, so general statements about shelf life should be read as approximate.
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.
== Diagnosis == Surgical wounds can begin to open between three and five days after surgery. The wound usually appears red and can be accompanied by drainage. Clinicians delay re-opening the wound unless it is necessary due to the potential of other complications. If the surgical wound worsens, or if a rupture of the digestive system is suspected the decision may be to investigate the source of the drainage or infection.
→ However, IUPAC structure based nomenclature is based on naming of the preferred constitutional repeating unit. IUPAC has also issued guidelines for abbreviating new polymer names. 138 common polymer abbreviations are also standardized in the standard ISO 1043–1.
Because of its polarity, a molecule of water in the liquid or solid state can form up to four hydrogen bonds with neighboring molecules. Hydrogen bonds are about ten times as strong as the Van der Waals force that attracts molecules to each other in most liquids. This is the reason why the melting and boiling points of water are much higher than those of other analogous compounds like hydrogen sulfide. They also explain its exceptionally high specific heat capacity (about 4.2 J/(g·K)), heat of fusion (about 333 J/g), heat of vaporization (2257 J/g), and thermal conductivity (between 0.561 and 0.679 W/(m·K)). These properties make water more effective at moderating Earth's climate, by storing heat and transporting it between the oceans and the atmosphere. The hydrogen bonds of water are around 23 kJ/mol (compared to a covalent O–H bond at 492 kJ/mol). Of this, it is estimated that 90% is attributable to electrostatics, while the remaining 10% is partially covalent. These bonds are the cause of water's high surface tension and capillary forces. Capillary action refers to the tendency of water to move up a narrow tube against the force of gravity. This property is relied upon by all vascular plants, such as trees.
When bacteria grow in anaerobic environments, the terminal electron acceptor is reduced by an enzyme called a reductase. E. coli can use fumarate reductase, nitrate reductase, nitrite reductase, DMSO reductase, or trimethylamine-N-oxide reductase, depending on the availability of these acceptors in the environment. Most terminal oxidases and reductases are inducible. They are synthesized by the organism as needed, in response to specific environmental conditions.
Sources: en.wikipedia.org
The members of Rush have been acknowledged as some of the most proficient players on their respective instruments, with each winning numerous awards in magazine readers' polls in various years. As of 2026, Rush ranks 90th in the US with sales of 27 million albums and industry sources estimate their total worldwide album sales at over 43 million. They have been awarded 14 platinum and 3 multi-platinum albums in the US and 17 platinum albums in Canada. Rush was nominated for seven Grammy Awards, won ten Juno Awards, and won an International Achievement Award at the 2009 SOCAN Awards. The band was inducted into the Canadian Music Hall of Fame in 1994 and the Rock and Roll Hall of Fame in 2013. Music critics consider Rush to be one of the greatest rock bands of all time.
The Transitional Government of Ethiopia (TGE) was an era established immediately after the Ethiopian People's Revolutionary Democratic Front (EPRDF) seized power from the Marxist-Leninist People's Democratic Republic of Ethiopia (PDRE) in 1991. During the transitional period, Meles Zenawi served as the president of the TGE while Tamrat Layne was prime minister. Among other major shifts in the country's political institutions, it was under the authority of the TGE that the realignment of provincial boundaries on the basis of ethnolinguistic identity occurred. The TGE was in power until 1995, when it transitioned into the reconstituted Federal Democratic Republic of Ethiopia that remains today.
== Pollution == Selenium pollution might impact some aquatic systems and may be caused by anthropogenic factors such as farming runoff and industrial processes. People who eat more fish are generally healthier than those who eat less, which suggests no major human health concern from selenium pollution, although selenium has a potential effect on humans. Selenium poisoning of water systems may result whenever new agricultural run-off courses through dry lands. This process leaches natural soluble selenium compounds (such as selenates) into the water, which may then be concentrated in wetlands as the water evaporates. Selenium pollution of waterways also occurs when selenium is leached from coal flue ash, mining and metal smelting, crude oil processing, and landfill. High selenium levels in waterways were found to cause congenital disorders in oviparous species, including wetland birds and fish. Elevated dietary methylmercury levels can amplify the harm of selenium toxicity in oviparous species. Selenium is bioaccumulated in aquatic habitats, which results in higher concentrations in organisms than the surrounding water. Organoselenium compounds can be concentrated over 200,000 times by zooplankton when water concentrations are in the 0.5 to 0.8 μg Se/L range. Inorganic selenium bioaccumulates more readily in phytoplankton than zooplankton. Phytoplankton can concentrate inorganic selenium by a factor of 3000. Further concentration through bioaccumulation occurs along the food chain, as predators consume selenium-rich prey.
Sources: en.wikipedia.org
He consulted the weather records for 1928, and found that, as in 1966, there was a heat wave in mid-August followed by nine days of cold weather starting on 28 August that greatly favoured the growth of the mould.
=== Environment === PMOS may also be impacted by epigenetics, which regulates how active genes are. High levels of androgens and AMH during pregnancy and early weight gain can hinder the fetal environment. In studies of PMOS in mice, exposure to AMH or the androgen dihydrotestosterone still has an effect three generations later. If that is so in humans, it implies that PMOS can be inherited via epigenetic changes. Blood in the umbilical cord of babies whose mothers have PMOS shows specific epigenetic changes suggestive of PMOS. There is little evidence on the effect of environmental pollutants on PMOS risk. Hormone disruptors are chemicals that disturb the hormonal system by blocking or mimicking natural hormones. Of these, bisphenol A and phthalates (both used in plastics), and possibly octocrylene exposure may raise the risks of PMOS. Obesity is implicated in PMOS development. As fat tissue can produce androgens, obesity leads to increased androgen levels. It also leads to suppression of the SHBG hormone, increased insulin resistance, and abnormally increased insulin levels. Some of the effects go both ways: PMOS might impact appetite, so that weight gain becomes more likely. Weight loss using diet is equally effective in people with and without PMOS.
=== OB3b === Methanobactin OB3b is a commonly studied methanobactin. It has a molecular weight of 1154Da when metal free. OB3b is composed of 9 amino acid residues with two oxazolone rings, which take part in binding to copper ions. The oxazalone rings are susceptible to cleavage under low pH conditions, which releases any metal ion bound to the rings. Copper is bound and reduced at a tetradentate binding site composed of 2 oxazolone rings and 2 modified enethiol groups. In particular, the origin and function of these oxazolone rings in methanobactin OB3b has been the subject of research, since these domains appear unique. In 2010, it was suggested that mb OB3b is derived from a small, ribsomally-produced peptide precursor with the sequence of L-C-G-S-C-Y-P-C-S-C-M. Functional mbOB3b is composed of (isobutyl group)-(Oxazolone ring A)-G-S-C-Y-(Oxazolone ring B)-S-M. (Note that some specimens of mBOB3b are found without the C-terminal methionine and appear fully functional.) It has been argued that the chromophoric rings of this particular species of methanobactin enable mbOB3b to bind and reduce other metals. For example, mbOB3b can reduce Ag(I) to Ag(0), Au(III) to Au(0), Cr(VI) to Cr(III), and Hg(II) to Hg(I); it is also able to bind Co(II), Zn (II), Mn(II), Pb(II), and U(IV). Because of this, it is possible that methanobactin may have several medical and environmental applications as a metal chelator and reducing agent. The mechanism of metal reduction is currently undetermined.
As part of Lenin's pragmatic compromise with external financial interests in 1918, Bolshevik state capitalism temporarily returned 91% of industry to private ownership or trusts until the Soviet Russians learned the technology and the techniques required to operate and administrate industries. Importantly, Lenin declared that the development of socialism would not be able to be pursued in the manner originally thought by Marxists. A key aspect that affected the Bolshevik regime was the backward economic conditions in Russia that were considered unfavourable to orthodox Marxist theory of communist revolution. At the time, orthodox Marxists claimed that Russia was ripe for the development of capitalism, not yet for socialism. Lenin advocated the need of the development of a large corps of technical intelligentsia to assist the industrial development of Russia and advance the Marxist economic stages of development as it had too few technical experts at the time. In that vein, Lenin explained it as follows: "Our poverty is so great that we cannot, at one stroke, restore full-scale factory, state, socialist production." He added that the development of socialism would proceed according to the actual material and socio-economic conditions in Russia and not as abstractly described by Marx for industrialised Europe in the 19th century. To overcome the lack of educated Russians who could operate and administrate industry, Lenin advocated the development of a technical intelligentsia who would propel the industrial development of Russia to self-sufficiency.
Sources: en.wikipedia.org
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.
The label was first attached to the albumin-binding form during early development work. A shorter analog without the linker later became known by the same name in informal use. Published papers normally state which version was studied, so the methods section resolves the ambiguity.
It is a synthetic peptide rather than a steroid, and it does not occur naturally in the body. Its sequence is derived from a hypothalamic hormone called growth hormone-releasing hormone. It works as a receptor agonist rather than as a replacement for that hormone.
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.