The short version of ipamorelin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-11-06 and is reviewed periodically as new material appears.
The molecule contains five residues, including alpha-aminoisobutyric acid, D-2-naphthylalanine, and D-phenylalanine, and it ends in a lysine amide. Non-natural and D-configured residues make the chain less susceptible to common peptidases, which helps explain its resistance to rapid breakdown. Its molecular formula is C38H49N9O5, corresponding to a free-base mass near 711.9 daltons. The C-terminal amide removes a negative charge and is a recurring feature in receptor-active peptides of this family. These structural choices are usually discussed as the basis for its selectivity profile.
Published animal and early human work describes growth hormone release that is separated from comparable rises in adrenocorticotropic hormone and cortisol. Prolactin changes are reported as small in the same studies. Selectivity is attributed to binding at the ghrelin receptor and to the downstream signaling that follows, rather than to differences in how quickly the peptide is cleared. Authors commonly label the compound selective rather than potent, because the same mass produces a smaller growth hormone response than some older secretagogues tested in parallel. Whether that profile holds across species and routes of administration remains an open question.
Human data remain limited and come mainly from small, short-term studies conducted decades ago. The peptide has not received approval as a medicine from major regulators, so current availability is largely as a research chemical. Reported effects on growth hormone pulsatility, appetite, and body composition should be read as preliminary, since few independent groups have replicated the original findings. Analytical characterization of research-grade material varies between suppliers, which complicates comparison across studies. Regulatory status also differs by country, and some jurisdictions classify it as a prescription-only or otherwise restricted item.
现有文献多来自小规模、短期的研究，涉及生长激素缺乏、术后肠麻痹等方向。长期使用是否导致受体脱敏，以及重复给药后效应是否衰减，仍属开放问题。不同研究之间的剂量、给药途径和受试者特征差异较大，因此结论外推需谨慎。关于临床获益的确切证据尚不充分，需要更大规模的对照试验来澄清。
Ipamorelin 是一种合成五肽，在 20 世纪 90 年代被报道为生长激素促分泌剂。其结构基于胃饥饿素受体激动剂的设计思路，但并非天然激素。早期药理学研究显示，它可刺激垂体释放生长激素，而对应激激素轴的影响相对较小。该化合物常被用作研究生长激素调节通路的工具分子。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C38H49N9O5 | Value for the free base |
| Molar mass | 711.9 g/mol | Calculated from the formula |
| Appearance | White to off-white powder | Typical lyophilized form |
| Mechanism class | Ghrelin receptor agonist | Also described as a secretagogue |
| Half-life | About 2 hours | Reported for human circulation |
Purity is normally reported as a percentage of total peak area, a figure that does not account for water content, residual solvents, or counterions. Trifluoroacetate and acetate are the most frequent counterions in lyophilized peptides, and they shift the true peptide content away from the mass of the powder. A separate quantitative assay is therefore needed to state content accurately. Certificates of analysis often omit these details, which makes batch-to-batch comparison difficult and limits conclusions drawn when results from different suppliers are compared.
Lyophilized material is generally held at minus twenty degrees Celsius or lower, protected from moisture and light. Repeated excursions to room temperature cause condensation inside the vial and gradual moisture uptake, both of which shorten shelf life. Containers should be allowed to equilibrate before opening so that water does not condense on the solid. Dividing a batch into single-use aliquots reduces freeze-thaw cycling. Solid peptide handled this way is usually considered stable for months to years, while the same material in solution degrades on a much shorter timescale.
Common solvents for laboratory work include water, buffered saline, and dimethyl sulfoxide. Once dissolved, the peptide is exposed to hydrolysis and oxidation, and alkaline conditions accelerate breakdown. Low-binding plasticware and the addition of a carrier protein reduce losses to container surfaces, which can otherwise be substantial at low concentrations. Solutions are typically kept cold and used within days. Investigators working with the compound generally prepare fresh working dilutions rather than storing dilute stocks, and they avoid repeated warming of the same vial.
Ipamorelin is a synthetic pentapeptide that belongs to the growth hormone secretagogue family. Its sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2, and its molecular mass is approximately 711.9 daltons. The compound was described in the late 1990s by researchers seeking molecules that release growth hormone with fewer side effects than earlier secretagogues. It is a laboratory and research compound, not an approved medicine in most jurisdictions.
At the molecular level, ipamorelin acts as an agonist at the growth hormone secretagogue receptor, also called the ghrelin receptor or GHS-R1a. Binding to this receptor on pituitary somatotroph cells triggers a signaling cascade that leads to growth hormone release. The effect is mediated through phospholipase C and calcium mobilization rather than through the cyclic AMP pathway used by growth hormone releasing hormone. The two pathways are complementary, and combined stimulation produces a larger response than either alone.
Official website Buffalopedia Archived 7 December 2019 at the Wayback Machine, created by CIRB Hisar Animal Info: Wild Asian (Water) Buffalo Creature features: Buffaloes Breeds of Livestock: Murrah National Agricultural Innovation Project: Identification of Quantitative Trait Loci for Milk yield, Fat and Protein Percent in Buffaloes
=== Malaysia === The Malaysian Armed Forces version of the 24-hour ration pack is intended to provide one man with sufficient food and supplements for one day. Most items are domestically procured and cater to local tastes and religious dietary requirements. The ration makes extensive use of commercially available canned and dehydrated items. Wherever possible, plastic-foil pouches are used instead of cans. The ration is supplemented with precooked or freeze-dried rice. Example menu C: Beef Kurma, Chicken Masak Merah, Fish Curry, and Sambal Shrimp; Bean Curd and Vegetable mix; long bean stew; canned pineapple and canned papaya; 2 packages of quick-cooking porridge (black bean porridge and flour porridge); military biscuits; jam; instant coffee; tea; instant milk powder; sugar; salt; vitamin tablets; matches; and napkins.
== Results == The plebiscite took place on 11 July 1920, when Poland appeared on the verge of defeat in the Polish-Soviet War (see Miracle at the Vistula). The pro-German side was able to organise a very successful propaganda campaign by building on the long campaign of Germanisation; notably, the plebiscite asking the electorate to vote for Poland or East Prussia is said to have masked the pro-German choice under the provincial name of East Prussia. However, the weight of that argument can not have been strong because the voters were aware East Prussia was just a German province, not a sovereign state, as an alternative for Germany. The activity of pro-German organisations and the Allied support for the participation of those who were born in the plebiscite area but did not live there any longer helped the vote toward Germany. In the end, the weight of the evidently-substantial number of pro-German emigration voters can be ignored in the light of the 96% pro-German overall total. Anyway, the plebiscite resulted in a vast majority for East Prussia. Only a small part of the territory affected by the plebiscite was awarded to Poland, and most of it remained in Germany. Poland's supposed disadvantage by the Versailles Treaty stipulation was that it enabled those to return to vote if they were born in the plebiscite areas but no longer living there. Most of them were supposed to have been influenced by German national sentiments. For that reason, German nationalist societies and political parties wanted to assist them by facilitating their travel to the plebiscite area.
The most common vehicle currently used for targeted drug delivery is the liposome. Liposomes are non-toxic, non-hemolytic, and non-immunogenic even upon repeated injections; they are biocompatible and biodegradable and can be designed to avoid clearance mechanisms (reticuloendothelial system (RES), renal clearance, chemical or enzymatic inactivation, etc.) Lipid-based, ligand-coated nanocarriers can store their payload in the hydrophobic shell or the hydrophilic interior depending on the nature of the drug/contrast agent being carried. The only problem to using liposomes in vivo is their immediate uptake and clearance by the RES system and their relatively low stability in vitro. To combat this, polyethylene glycol (PEG) can be added to the surface of the liposomes. Increasing the mole percent of PEG on the surface of the liposomes by 4-10% significantly increased circulation time in vivo from 200 to 1000 minutes. PEGylation of the liposomal nanocarrier elongates the half-life of the construct while maintaining the passive targeting mechanism that is commonly conferred to lipid-based nanocarriers. When used as a delivery system, the ability to induce instability in the construct is commonly exploited allowing the selective release of the encapsulated therapeutic agent in close proximity to the target tissue/cell in vivo. This nanocarrier system is commonly used in anti-cancer treatments as the acidity of the tumour mass caused by an over-reliance on glycolysis triggers drug release.
Fulton G. Kitson; Barbara S. Larsen, Charles N. McEwen (1996) Gas Chromatography and Mass Spectrometry: A Practical Guide Academic Press. Barbara S. Larsen; Charles N. McEwen (Eds.) (2014) Mass Spectrometry of Biological Materials. 2nd Edition. CRC Press. Book chapters
Sources: en.wikipedia.org
Geneviève Meurgues (4 February 1931 - 21 December 2021) was a French explorer, museologist, curator, conservator, chemical engineer and lecturer. As a professor at the Muséum national d'histoire naturelle, she specialised in the conservation of natural history specimens. She is noted for the preservation of the Roman boat found in Marseille and for her contribution to the establishment of the grande galerie de l'évolution du Muséum national d'histoire naturelle in Paris.
=== Deliberate === Although 210Po occurs in trace amounts in nature, it is not abundant enough (0.1 ppb) for extraction from uranium ore to be feasible. Instead, most 210Po is produced synthetically, through neutron bombardment of 209Bi in a nuclear reactor. This process converts 209Bi to 210Bi, which has a half-life of five days and beta decays to 210Po. Through this method, it was reported in February 2007 that approximately 8 grams (0.28 oz) of 210Po was produced in Russia and shipped to the United States every month for commercial applications.
=== Diabetes and pregnancy === A total review of metformin use during pregnancy compared to insulin alone found good short-term safety for both the mother and baby, but safety in the longer term is unclear. Several observational studies and randomized controlled trials found metformin to be as effective and safe as insulin for the management of gestational diabetes. Nonetheless, several concerns have been raised and evidence on the long-term safety of metformin for both mother and child is lacking. Compared with insulin, women with gestational diabetes treated with metformin gain less weight and are less likely to develop pre-eclampsia during pregnancy. Babies born to women treated with metformin have less visceral fat, and this may make them less prone to insulin resistance in later life. The use of metformin for gestational diabetes resulted in smaller babies compared to treatment with insulin. However, despite initially lower birth weight, children exposed to metformin during pregnancy had accelerated growth after birth, and were heavier by mid-childhood than those exposed to insulin during pregnancy. This pattern of initial low birth weight followed by catch-up growth that surpasses comparative children has been associated with long-term cardiometabolic disease. A systematic review and meta-analysis of metformin, published in 2024, found that it is safe and effective in managing gestational diabetes or diabetes in pregnancy with no adverse impact on the mother or the child after eleven years of childbirth.
=== Metabolism === Nicotine decreases hunger and as a consequence food consumption, alongside increasing energy expenditure. The majority of research shows that nicotine reduces body weight, but some researchers have found that nicotine may result in weight gain under specific types of eating habits in animal models. Nicotine effect on weight appears to result from nicotine's stimulation of α3β4 nAChR receptors located in the POMC neurons in the arcuate nucleus and subsequently the melanocortin system, especially the melanocortin-4 receptors on second-order neurons in the paraventricular nucleus of the hypothalamus, thus modulating feeding inhibition. POMC neurons are a precursor of the melanocortin system, a critical regulator of body weight and peripheral tissue such as skin and hair.
Sources: en.wikipedia.org
It has not been approved as a therapeutic by major regulators, and the human trial record is small and dated. Material available today is mostly sold as a research chemical for laboratory use. Approval and restriction status varies by country.
It binds the ghrelin receptor, known as the growth hormone secretagogue receptor type 1a. Activation of that receptor triggers signaling that leads to growth hormone release. Selectivity for growth hormone over cortisol and prolactin is the property most often cited for this compound.
Published estimates place the circulating half-life at roughly two hours in humans. Clearance involves peptidase activity and renal handling. Because the peptide is short-lived, release patterns after administration are usually described as pulsatile rather than sustained.
不是。它属于人工合成的五肽，设计上模拟胃饥饿素受体的部分作用，但不存在于人体天然激素谱中。