If you have been reading about CJC-1295 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-06-07. Numbers and descriptions here follow the published literature rather than marketing material.
Lyophilised powder is the usual supplied form. The material is hygroscopic, so vials are typically equilibrated to room temperature before opening in order to prevent condensation on the contents. Long-term storage is generally described at minus twenty degrees Celsius or colder, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of soluble material. A reconstituted solution is considerably less stable than the dry powder and is normally kept refrigerated for short periods only.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography combined with mass spectrometry. The chromatographic separation resolves the target peptide from truncation products and from species carrying oxidised residues, while mass measurement confirms the expected molecular mass. Because the two common variants differ by roughly 280 daltons, a mass determination distinguishes them unambiguously. Purity is often quoted as a percentage of total peak area, although that figure depends on the detection wavelength and the integration method applied.
Reported half-lives differ widely between the two variants and between species. Values for the albumin-binding form are usually expressed in days, while the unconjugated form is measured in minutes to a few hours. Sampling schedules, assay sensitivity, and route of administration all influence the numbers, which limits direct comparison across studies. Whether sustained receptor occupancy produces different downstream effects from pulsatile stimulation remains an open question in the published work. Claims about relative potency should therefore be read alongside the specific study design that produced them.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance as powder | White to off-white solid | Minor batch-to-batch variation is normal |
| Solubility class | Soluble in water and aqueous buffers | Dissolution can be slowed by aggregates |
| Typical storage temperature | Minus 20 degrees Celsius or below | Protected from light and moisture |
| Storage after reconstitution | 2 to 8 degrees Celsius, short term | Longer holding requires freezing |
| Common analytical method | Reversed-phase HPLC with mass spectrometry | Used for purity and identity confirmation |
Studies in this area generally track growth hormone pulses, insulin-like growth factor 1 concentrations, and occasionally body composition endpoints. Most published human data come from early, small trials, and questions about long-term effects remain open. Whether repeated exposure alters pituitary responsiveness over time is not settled. Analytical work relies on immunoassays for the hormones and on mass spectrometry for the peptide itself, because the two measurements answer different questions.
Binding of the peptide to the growth hormone-releasing hormone receptor on pituitary somatotrophs triggers a G protein coupled cascade that raises cyclic AMP and opens calcium channels. The result is greater secretion of growth hormone into the bloodstream. Because the peptide acts at the same receptor as the natural hypothalamic hormone, its effect is amplified pulse size rather than an entirely separate release pathway. Receptor binding alone does not determine the response, since somatostatin tone and other inputs modulate the final output.
The albumin-binding version stays in circulation for days, because covalent attachment to serum albumin shields the peptide from rapid filtration and degradation. Reported half-lives for this form fall in the range of several days. The version without the linker is cleared in minutes, with estimates often near thirty minutes in animal work. These figures come from small studies and vary with assay method, species, and route, so they are best read as approximate rather than fixed constants.
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 Genetics & IVF Institute (GIVF) is an international provider of infertility and genetics services and products, and also engages in biomedical research in these fields. The Institute was founded in 1984 by Dr. Joseph D. Schulman and associates. GIVF headquarters are in Fairfax, VA, US, and its facilities include locations in Pennsylvania, Minnesota, California, and Texas in the United States, as well as in China, Mexico, and several other countries. Genetics & IVF Institute has been responsible for numerous key innovations to help couples have healthy babies and to improve the reproductive health of women. These include: First U.S. medical center to introduce non-surgical ultrasound guided egg retrieval (transvaginal oocyte retrieval) for IVF; achieved America's first frozen embryo twin birth; first American team to publicly report pregnancies using ICSI (intracytoplasmic sperm injection); first to offer clinical laboratory testing for certain mutations in the BRCA1 and BRCA2 genes which cause hereditary breast cancer; developed the important technique of non-surgical sperm aspiration for improved treatment of male infertility; first in the world to initiate ovarian cryopreservation for storage of oocytes for women with cancer; discovered a method (non-disclosing preimplantation genetic testing) for the effective prevention of Huntington disease; developed MicroSort, an important flow-cytometric human sperm separation technique for preconceptual gender selection.
Portal received critical acclaim, often earning more praise than either Half-Life 2: Episode Two or Team Fortress 2, two titles also included in The Orange Box. It was praised for its unique gameplay and dark, deadpan humor. Eurogamer cited that "the way the game progresses from being a simple set of perfunctory tasks to a full-on part of the Half-Life story is absolute genius", while GameSpy noted, "What Portal lacks in length, it more than makes up for in exhilaration." The game was criticized for sparse environments, and both criticized and praised for its short length. Aggregate reviews for the standalone PC version of Portal gave the game a 90/100 through 28 reviews on Metacritic. In 2011, Valve stated that Portal had sold more than four million copies through the retail versions, including the standalone game and The Orange Box, and from the Xbox Live Arcade version. The game generated a fan following for the Weighted Companion Cube—even though the cube itself does not talk or act in the game. Fans have created plush and papercraft versions of the cube and the various turrets, as well as PC case mods and models of the Portal cake and portal gun. Jeep Barnett, a programmer for Portal, noted that players have told Valve that they had found it more emotional to incinerate the Weighted Companion Cube than to harm one of the "Little Sisters" from BioShock.
== Global demand == Global EO demand has expanded from 16.6 Mt (18.3 million short tons) in 2004 to 20 Mt (22 million short tons) in 2009, while demand for refined EO expanded from 4.64 Mt (5.11 million short tons) in 2004 to 5.6 Mt (6.2 million short tons) in 2008. In 2009, demand is estimated to have declined to about 5.2 Mt (5.7 million short tons). Total EO demand registered a growth rate of 5.6% per annum during the period 2005 to 2009 and is projected to grow at 5.7% per annum during 2009 to 2013.
== Variations == Variants of the azlactone synthesis in which analogues of azlactones are used are sometimes advantageous. Hydantoin (in Bergmann modification), thiohydantoin and rhodanine have each been employed as the enolate-forming component of the condensation.
Sources: en.wikipedia.org
== External links == HMRbase: A database of hormones and their receptors Hormones at the U.S. National Library of Medicine Medical Subject Headings (MeSH) "Hormone". Merriam-Webster.com Dictionary. Merriam-Webster. OCLC 1032680871.
Jung was introduced to Freud's work by Bleuler whilst working at Burghölzli Hospital. Bleuler asked him to write a review of The Interpretation of Dreams (1899), which he read in 1900. In the early 1900s, psychology as a science was still in its early stages, but Jung became a qualified practitioner of Freud's new "psycho-analysis". Freud needed collaborators and pupils to validate and spread his ideas. Burghölzli was a renowned psychiatric clinic in Zurich, and Jung's research had already gained him international recognition. Jung sent Freud a copy of his Studies in Word Association in 1906. The same year, he published Diagnostic Association Studies, a copy of which he later sent to Freud, who had already purchased a copy. Preceded by a lively correspondence, Jung met Freud for the first time in Vienna on 3 March 1907.Jung recalled the discussion between himself and Freud as interminable and unceasing for 13 hours. Six months later, the then 50-year-old Freud sent a collection of his latest published essays to Jung in Zurich. This began an intense correspondence and collaboration that lasted six years. In 1908, Jung became an editor of the newly founded Yearbook for Psychoanalytical and Psychopathological Research. In the late summer of 1909, Jung sailed with Freud and Hungarian psychoanalyst Sándor Ferenczi to the United States. From 7–11 September, they took part in the twentieth-anniversary celebration of the founding of Clark University in Worcester, Massachusetts, the Vicennial Conference on Psychology and Pedagogy.
Kimchi is one of the most important staples of Korean cuisine. The Korean term "Kimchi" refers to fermented vegetables, and encompasses salt and seasoned vegetables. It is mainly served as a side dish with every meal, but also can be served as a main dish. Kimchi is mainly recognized as a spicy fermented cabbage dish globally. New variations of kimchi continue to be created, and the taste can vary depending on the region and season. Conventionally, the secret of kimchi preparation was passed down by mothers to their daughters in a bid to make them suitable wives to their husbands. However, with the current technological advancement and increase in social media use, many individuals worldwide can now access recipes for kimchi preparation. Kimchi can be categorized by main ingredients, regions or seasons. Korea's northern and southern sections have a considerable temperature difference. There are over 180 recognized varieties of kimchi. The most common kimchi variations are:
=== Intragenic complementation === When multiple copies of a polypeptide encoded by a gene form a complex, this protein structure is referred to as a multimer. When a multimer is formed from polypeptides produced by two different mutant alleles of a particular gene, the mixed multimer may exhibit greater functional activity than the unmixed multimers formed by each of the mutants alone. In such a case, the phenomenon is referred to as intragenic complementation (also called inter-allelic complementation). Intragenic complementation has been demonstrated in many different genes in a variety of organisms including the fungi Neurospora crassa, Saccharomyces cerevisiae and Schizosaccharomyces pombe; the bacterium Salmonella typhimurium; the virus bacteriophage T4, an RNA virus and humans. In such studies, numerous mutations defective in the same gene were often isolated and mapped in a linear order on the basis of recombination frequencies to form a genetic map of the gene. Separately, the mutants were tested in pairwise combinations to measure complementation. An analysis of the results from such studies led to the conclusion that intragenic complementation, in general, arises from the interaction of differently defective polypeptide monomers to form a multimer. Genes that encode multimer-forming polypeptides appear to be common.
As early as 1941, integration of the many-body equations of motion was carried out with analog computers. Some undertook the labor-intensive work of modeling atomic motion by constructing physical models, e.g., using macroscopic spheres. The aim was to arrange them in such a way as to replicate the structure of a liquid and use this to examine its behavior. J.D. Bernal describes this process in 1962, writing:... I took a number of rubber balls and stuck them together with rods of a selection of different lengths ranging from 2.75 to 4 inches. I tried to do this in the first place as casually as possible, working in my own office, being interrupted every five minutes or so and not remembering what I had done before the interruption.Following the discovery of microscopic particles and the development of computers, interest expanded beyond the proving ground of gravitational systems to the statistical properties of matter. In an attempt to understand the origin of irreversibility, Enrico Fermi proposed in 1953, and published in 1955, the use of the early computer MANIAC I, also at Los Alamos National Laboratory, to solve the time evolution of the equations of motion for a many-body system subject to several choices of force laws. Today, this seminal work is known as the Fermi–Pasta–Ulam–Tsingou problem. The time evolution of the energy from the original work is shown in the figure to the right.
Sources: en.wikipedia.org
Chromatography reports how much material elutes as a single peak but does not confirm what that material is. Mass spectrometry supplies the molecular mass, which is characteristic of a given sequence and its modifications. Together the two methods support both a purity figure and an identity claim.
Hydrolysis, oxidation of susceptible residues, and aggregation all contribute, and their rates depend on pH, temperature, and concentration. Dissolved oxygen and trace metal ions accelerate oxidation. Keeping solutions cold, dilute, and free of unnecessary handling reduces these pathways.
Not always, because the value depends on the detection wavelength, the gradient, and how peak areas are integrated. A figure of ninety-eight percent from one laboratory may not mean the same as the same number from another. Comparing full chromatograms and mass spectra is more informative than comparing a single number.
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.