This is a working overview of MOD GRF 1-29, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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 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 |
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.
The drug affinity complex is a maleimidopropionic acid group attached to a lysine side chain. It reacts with the free thiol of cysteine-34 on circulating albumin, forming a covalent bond. This conjugation keeps the peptide in the bloodstream and shields it from rapid renal filtration and proteolysis. Reported circulation half-lives for the albumin-bound form fall in the range of roughly six to nine days in early human studies.
Lyophilized peptide powder is comparatively stable when kept dry, cold, and protected from light. Once dissolved, the molecule is vulnerable to deamidation, oxidation, and aggregation, with the rate depending on pH, buffer composition, and temperature. Alkaline conditions and repeated freeze-thaw cycles accelerate loss of the intact peptide. The methionine present in the native sequence is a known oxidation site, which is one reason it was replaced in the modified fragment. Suppliers typically recommend cold storage of solutions and use within a short window.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
==== MeSH D12.776.664.962.444 – mrna cleavage and polyadenylation factors ==== MeSH D12.776.664.962.444.240 – cleavage and polyadenylation specificity factor MeSH D12.776.664.962.444.249 – cleavage stimulation factor
== Veterinary use == Yohimbine has been used since the 1970s to reverse the effects of xylazine. A 2011 preliminary study found that intravenous yohimbine has slow elimination and a large distribution in horses. Yohimbine is not commonly used in small animal medicine anymore but is still commonly used in large animal medicine to reverse α2 adrenergic receptor agonists such as xylazine.
=== Hart House === In August 2022, Hart debuted a vegan restaurant, Hart House, to compete with fast-food chains by "offering flavorful plant-based alternatives". The restaurant opened in Los Angeles, California, about a mile from Los Angeles International Airport (LAX), with a simple menu of veggie burgers and Chick'n products. The restaurant's offerings are claimed to be "entirely free of cholesterol, antibiotics, hormones, artificial colors, preservatives, high-fructose corn syrup, or trans fats", and inspired by Hart's own "health nut" lifestyle. Hart opened a second location in Monrovia, California, in November 2022, a third on Sunset Boulevard in Hollywood, California, in May 2023, and a fourth location near the University of Southern California campus in June 2023. All locations closed in September 2024.
Sources: en.wikipedia.org
=== Steroid hormone activity === The effects of testosterone in humans and other vertebrates occur by way of multiple mechanisms: by activation of the androgen receptor (directly or as dihydrotestosterone), and by conversion to estradiol and activation of certain estrogen receptors. Androgens such as testosterone have also been found to bind to and activate membrane androgen receptors. Free testosterone (T) is transported into the cytoplasm of target tissue cells, where it can bind to the androgen receptor, or can be reduced to 5α-dihydrotestosterone (5α-DHT) by the cytoplasmic enzyme 5α-reductase. 5α-DHT binds to the same androgen receptor even more strongly than testosterone, so that its androgenic potency is about 5 times that of T. The T-receptor or DHT-receptor complex undergoes a structural change that allows it to move into the cell nucleus and bind directly to specific nucleotide sequences of the chromosomal DNA. The areas of binding are called hormone response elements (HREs), and influence transcriptional activity of certain genes, producing the androgen effects. Androgen receptors occur in many different vertebrate body system tissues, and both males and females respond similarly to similar levels. Greatly differing amounts of testosterone prenatally, at puberty, and throughout life account for a share of biological differences between males and females. The bones and the brain are two important tissues in humans where the primary effect of testosterone is by way of aromatization to estradiol.
=== No development reported === AB-101 (RJ-101) – undefined mechanism of action – female sexual dysfunction [41] Apomorphine intranasal – non-selective dopamine receptor agonist, other actions – erectile dysfunction, female sexual dysfunction [42] Armodafinil ((R)-modafinil; D-modafinil; NH-02D; NH02D) – atypical dopamine reuptake inhibitor (DRI) – premature ejaculation [43] [44] Deuterated testosterone (d3-testosterone) – androgen (androgen receptor agonist) – female sexual dysfunction [45] Epelsiban (GSK557296; GSK-557296) – oxytocin receptor antagonist – premature ejaculation [46] Estradiol/testosterone topical gel (LibiGel-E/T; testosterone/estradiol topical gel) – combination of estradiol (estrogen) and testosterone (androgen) – female sexual dysfunction [47] Fibroblast growth factor 1 (FGF-1; FGF1; Acidic FGF; aFGF; Cardio Vascu-Grow; CVBT-141P; CVBT-141S; CVBT-141A; CVBT-141B; CVBT-141C; CVBT-141D; CVBT-141E; CVBT-141ED; CVBT-141F; CVBT-141G; CVBT-141H; FGF-1(141); VT-141D; VT-141ED; VT-141P; VT-141S) – fibroblast growth factor receptor (FGFR) agonist – erectile dysfunction [48] FKK-01PD (FKK-01PD; TGHW-01AP; TGHW01AP) – non-selective dopamine receptor agonist, other actions (apomorphine prodrug) – erectile dysfunction [49] GSK-958108 (GSK958108) – serotonin 5-HT1A receptor antagonist – premature ejaculation [50] HCP-1302 (HCP1302) – undefined mechanism of action – erectile dysfunction [51] Lidocaine topical gel – sodium channel blocker, local anesthetic – dyspareunia [52] PTL-2015 – undefined mechanism of action – erectile dysfunction [53] Research programme: nerve-targeted gene therapy - Periphagen (NC-3; NE-2; NE2-Endomorphin; NG-2; NG2-GAD; NN1-Neurotrophin) – various actions – erectile dysfunction [54] Research programme: sexual dysfunction therapy - Palatin Technologies (PL-6983) – melanocortin receptor modulators – erectile dysfunction, female sexual dysfunction [55] Sildenafil (KW-25084) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [56] Sildenafil orally soluble film (CURE-5003; CUREfilm Blue) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [57] Sildenafil oral spray (Duromist; NVD-401; SUD-003; SUD-004; SUDA-004; Sudamist) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [58] Tadalafil dry powder inhalation (Tadalafil Technosphere) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [59] Tadalafil orodispersible film tablet (Caliberi) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [60] Tadalafil topical (Extrinsa) – phosphodiesterase PDE5 inhibitor – female sexual dysfunction [61] Tadalafil/tamsulosin – combination of tadalafil (phosphodiesterase PDE5 inhibitor) and tamsulosin (α1-adrenergic receptor antagonist) – erectile dysfunction [62] Tunodafil (ecocarbamate; gluconocin; yonkenafil) – phosphodiesterase PDE5 inhibitor – erectile dysfunction [63] Vilazodone (EMD-68843; SB-659746A; Viibryd) – serotonin reuptake inhibitor (SRI), serotonin 5-HT1A receptor agonist – sexual function disorders [64] Zotarolimus (ABT-578; Endeavor; Endeavor Resolute; MDT-4107 DES; Resolute DES; Resolute Integrity; Resolute Onyx; ZoMaxx) – FK-binding protein 12 (FKBP12) ligand and mechanistic target of rapamycin (mTOR) inhibitor – erectile dysfunction [65]
The study also highlights economy-specific gap analyses, which illustrate gaps in policy coverage and estimate potential energy savings achieved through the adoption of world’s most comprehensive standards. Compliance Counts: A Practitioners Guidebook on Best Practice Monitoring, Verification, and Enforcement (MV&E) for Appliance Standards &Labeling The Guidebook, published in collaboration with Mark Ellis & Associates, is designed as a step-by-step manual for policymakers and S&L program administrators to design and implement a successful compliance regime. Drawing on the experiences of existing S&L programs worldwide, the Guidebook provides different approaches to implementing and improving all aspects of a compliance framework, including establishment of a legal basis for MV&E activities and enforcement options for non-compliance. According to the guidebook, effective compliance regimes: ensure that consumers receive the products they expect when making purchasing decisions; provide industry participants a fair market in which to operate; and safeguard current and future energy and greenhouse gas emissions savings from S&L programs, among other benefits. Energy Efficiency Labels and Standards: A Guidebook for Appliances, Equipment, And Lighting (also available in Chinese, Spanish and Korean) This guidebook is designed as a manual for government officials and others around the world responsible for developing, implementing, enforcing, monitoring, and maintaining energy efficiency labeling and standard-setting programs. Tools
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.
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.