A practical reference on CJC-1295: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-02-18. Anything still debated is marked as such rather than presented as settled.
CJC-1295 is a synthetic peptide belonging to the growth hormone-releasing hormone analog family. It comprises twenty-nine amino acid residues derived from the N-terminal region of natural GHRH. The molecule incorporates several non-natural substitutions that increase resistance to enzymatic degradation. These modifications extend its activity compared with the native hormone fragment. Researchers use it to study pituitary growth hormone secretion in laboratory and clinical settings. This compound is distinct from native GHRH in its stability profile.
Two principal forms appear in the literature and in research supply. One carries a drug affinity complex, a maleimide-based group that forms a covalent bond with circulating albumin. This linkage slows clearance and produces a long-lasting elevation of peptide levels. The other form lacks that group and is often labeled MOD GRF(1-29). It has a much shorter circulation time. Both variants retain the same core receptor-binding sequence. Reported half-lives differ substantially between the two.
Two related forms appear under the CJC-1295 name. The simpler analogue, commonly written as modified GRF(1-29), carries the four substitutions but no additional conjugation. The second form attaches a maleimidopropionic acid linker to a lysine residue, a modification frequently called the drug affinity complex. That linker reacts with the free thiol on serum albumin to form a covalent bond. Because albumin has a long residence time in blood, the conjugated peptide stays in circulation far longer than the unconjugated analogue.
Receptor level activity follows the canonical GHRH pathway. The peptide binds the GHRH receptor, a class B G protein coupled receptor on somatotroph cells of the anterior pituitary. Binding raises intracellular cyclic AMP, which promotes calcium entry and the release of growth hormone into the bloodstream. Because the molecule acts at the same receptor as the endogenous hormone, its effect is superimposed on the natural pulsatile rhythm rather than replacing it. Whether sustained receptor occupation leads to desensitization is not fully settled.
| Property | Value | Notes |
|---|---|---|
| Molecular weight, DAC form | About 3647 Da | Varies with salt form |
| Molecular weight, non-DAC form | About 3358 Da | MOD GRF(1-29) |
| Solubility class | Water soluble | Also dissolves in polar solvents |
| Reported half-life, DAC form | About five to eight days | Values from human studies |
| Common synonyms | CJC-1295; MOD GRF(1-29) | Name depends on variant |
CJC-1295 belongs to a family of synthetic peptides modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound is built from the first twenty-nine amino acids of the natural human sequence, a fragment that retains full receptor binding capacity. Native growth hormone-releasing hormone is degraded quickly in circulation, so the fragment alone has limited practical value. Early work therefore focused on chemical modifications that preserve receptor binding while slowing enzymatic breakdown. The result is a molecule described in the literature as a long-acting analog of the natural hormone.
Two forms circulate under the CJC-1295 name, and they differ by a single appended group. The version without a drug affinity complex carries four substitutions along the peptide chain, including a D-alanine near the amino terminus and replacements at three other positions. These changes block the enzyme dipeptidyl peptidase IV and remove a methionine residue that is prone to oxidation. The modified fragment is frequently labeled MOD GRF 1-29. Naming conventions are inconsistent across informal sources, which is a common source of confusion.
Binding to GHRH receptors on pituitary somatotroph cells triggers cyclic AMP signaling and stimulates growth hormone synthesis and release. Because the peptide acts upstream of the pituitary, effects are mediated through endogenous growth hormone rather than direct receptor activation in peripheral tissues. Increases in insulin-like growth factor 1 are generally described as a downstream consequence. Most published human exposure data come from small early-stage studies, and the clinical significance of the pharmacokinetic profile remains incompletely characterized.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
Atul Malhotra is the Vice Chair of Medicine for Research and Research Chief of pulmonary, critical care, sleep medicine, and physiology at the University of California, San Diego's Medical School. In addition, he is the Peter C. Farrell Presidential Chair and tenured professor of medicine at the same university. He is the author of almost 600 original research publications and over 300 reviews and book chapters.
The secondary (or peripheral) lymphoid organs, which include lymph nodes and the spleen, maintain mature naive lymphocytes and initiate an adaptive immune response. The secondary lymphoid organs are the sites of lymphocyte activation by antigens. Activation leads to clonal selection and affinity maturation. Mature lymphocytes recirculate between the blood and the secondary lymphoid organs until they encounter their specific antigen.
=== Neonatal === Unlike other drugs, babies with prenatal exposure to methamphetamine do not show immediate signs of withdrawal. Instead, cognitive and behavioral problems start emerging when the children reach school age. A prospective cohort study of 330 children showed that at the age of 3, children with methamphetamine exposure showed increased emotional reactivity, as well as more signs of anxiety and depression; and at the age of 5, children showed higher rates of externalizing disorders and attention deficit hyperactivity disorder (ADHD).
15 June to 25 September Operation Iroquois Grove was a 1st Brigade, 5th Infantry Division (Mechanized) and 2nd Battalion, 5th Marines clear and search operation against PAVN Base Area 101 southeast of Quảng Trị City. the operation resulted in 134 PAVN and 13 U.S. killed.
Sources: en.wikipedia.org
has to be changed compared to the simple SIR model.) Early models of this type have been used to model the spread of the black death in Europe. Extensions of this model have been used to incorporate, e.g., effects of nonpharmaceutical interventions such as social distancing.
Nurses affiliated with the New Zealand Nurses Organisation in Auckland and Whangārei commence industrial action to protest staff shortages. A member of the New Zealand Defence Force pleads guilty before a court-martial to attempted espionage on behalf of a foreign country, in the first espionage conviction in New Zealand. He is sentenced to two years' imprisonment on 20 August. 19 August: The Interislander and Bluebridge cancel several ferry sailings due to strong swells in the Cook Strait. Foreign Minister Winston Peters recalls Trevor Mallard as New Zealand ambassador to Ireland, designating Angela Hassan-Sharp as his successor. Employees of media company Stuff vote to take strike action to protest their employer's plan to split their collective bargaining agreement. 20 August: Secondary school teachers affiliated with the Post Primary Teachers' Association went on strike for a day after rejecting the Government's one percent pay rise offer. The New Zealand Cabinet agrees to draft legislation banning greyhound racing in New Zealand. 21 August: Defence Minister Judith Collins and Foreign Minister Winston Peters announce that the Government will purchase two new Airbus A321XLR jets and five MH-60R Seahawks for the New Zealand Defence Force. Carter Holt Harvey proposes closing its Eves Valley Sawmill in the Tasman District, potentially affecting 142 jobs. Airliner Jetstar admits to 20 charges of breaching the Fair Trading Act 1986 by misleading customers about compensation.
== System components == A typical laboratory FPLC consist of one or two high-precision pumps, a control unit, a column, a detection system and a fraction collector. Although it is possible to operate the system manually, the components are normally linked to a personal computer or, in older units, a microcontroller.
== Disaccharide phosphorylases == Different biocatalytic approaches have been developed toward the synthesis of glycosides in past decades, for which glycosyltransferases and glycoside hydrolases are among the most common catalysts. The former often needs expensive materials and the latter often shows low yields. De Winter et al. investigated use of cellobiose phosphorylase (CP) toward synthesis of alpha-glycosides in ionic liquids. The best condition for use of CP was found to be in the presence of the ionic liquid AMMOENG 101 and ethyl acetate.
== See also == Trimethoxyamphetamine Substituted methoxyphenethylamine 2,4,5-Trimethoxyphenethylamine (2,4,5-TMPEA; 2C-O) 2,5-Dimethoxyamphetamine (2,5-DMA; DMA-4; DOH) 2,4-Dimethoxyamphetamine (2,4-DMA; DMA-3)
Sources: en.wikipedia.org
It is a synthetic peptide modeled on growth hormone-releasing hormone. The molecule is used in research on pituitary growth hormone secretion. It differs from the natural hormone through several stabilizing substitutions.
The DAC form carries a maleimide group that binds albumin and extends circulation time. The non-DAC form lacks this group and clears much faster. Both share the same receptor-binding core.
It targets the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Activation raises cyclic AMP and promotes growth hormone release. Normal feedback pathways remain part of the response.
The names are often used interchangeably in casual writing, but they are not strictly identical. Modified GRF(1-29) refers to the unconjugated analogue carrying only the four substitutions. The version sold as CJC-1295 with DAC includes the albumin binding linker and clears much more slowly.