Everything below concerns reference standard. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-12. Where a claim depends on a specific study, the study is described rather than over-claimed.
Retatrutide is an investigational synthetic peptide designed to activate three distinct receptor systems within a single molecule. Its pharmacological profile combines activity at the glucose-dependent insulinotropic polypeptide receptor, the glucagon-like peptide-1 receptor, and the glucagon receptor. This arrangement places it within a broader class of agents often described as multi-agonists, which contrast with compounds that engage one or two targets. Research interest centers on whether simultaneous signaling produces effects that single-receptor agonists cannot achieve alone. A single molecular entity also simplifies manufacturing and delivery logistics compared with combining separate agents.
Mechanistic proposals link each receptor to a different physiological role. Activation of the glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1 receptors is associated with reduced appetite, slower gastric emptying, and glucose-dependent insulin release. Glucagon receptor signaling, by contrast, is associated with increased energy expenditure and altered lipid handling, though it can also raise blood glucose. The design intent is to balance these contributions so that weight reduction is enhanced without unacceptable glycemic trade-offs. How well that balance holds across individuals is not fully resolved.
Published information places retatrutide in clinical development rather than on the market as an approved therapy. Early-stage and mid-stage trials have examined tolerability and changes in body weight, and larger studies continue to report results over time. Open questions include the durability of effects after treatment stops, the composition of weight lost, and cardiovascular outcomes over long periods. Statements about definitive benefit should therefore be treated as provisional. Regulatory status varies by jurisdiction and changes as applications are reviewed.
Identification and purity assessment rely on established analytical techniques. Reverse-phase high-performance liquid chromatography separates the compound from related impurities and degradation products. Mass spectrometry confirms molecular identity and detects modifications that change the expected mass. Additional methods such as amino acid analysis or capillary electrophoresis may be used for verification. Small differences in sample preparation can influence results, so procedures are usually controlled and documented in detail. Consistency between runs supports confidence in reported values.
Stability studies examine how the molecule changes under defined conditions of temperature, humidity, and light exposure over time. Results are used to set storage recommendations and shelf-life limits. In practice, lyophilized peptide material is often stored at low temperatures to slow degradation, while reconstituted solutions are handled more carefully because they are generally less stable. Reported stability data apply to specific formulations and conditions, so extrapolation to other preparations requires caution.
Retatrutide is handled in laboratories mainly as a lyophilized solid for analytical and biochemical research. The peptide is typically supplied as a white to off-white powder and is reconstituted in appropriate solvents before use. Because peptide-based molecules are sensitive to temperature, moisture, and repeated freeze-thaw cycles, proper storage conditions affect both stability and measurement accuracy. Laboratories generally follow documented handling procedures to maintain the integrity of the material across experiments.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Studied for metabolic indications |
| Receptor activity | GIP, GLP-1, and glucagon | Single molecule, three targets |
| Development status | Investigational | Not an approved therapy |
| Common synonym | LY3437943 | Development designation |
| Administration route | Subcutaneous injection | As used in clinical studies |
Development has progressed through early- and mid-stage human studies in adults with obesity and with type 2 diabetes. Published phase 2 data reported reductions in body weight and improvements in glycemic markers over the treatment period. No regulatory agency has approved the compound for any indication, and it remains available only within controlled research settings. Whether benefits observed in trials translate into durable outcomes after treatment stops is not yet established.
Retatrutide is an investigational synthetic peptide that acts as an agonist at three distinct G protein-coupled receptors. It combines activity at the glucagon-like peptide-1 receptor, the glucose-dependent insulinotropic polypeptide receptor, and the glucagon receptor within a single molecule. This multi-receptor profile distinguishes it from earlier incretin-based compounds that engage one or two of these pathways. Researchers designed the molecule to test whether simultaneous activation produces greater metabolic effects than single or dual agonism alone.
The peptide backbone is chemically modified to resist rapid enzymatic breakdown in the body. A fatty acid side chain promotes binding to serum albumin, which slows renal clearance and supports an extended circulation time. These modifications allow less frequent administration than would be possible with an unmodified peptide. The precise contribution of glucagon receptor activation to the overall metabolic effect remains an area of active investigation, because glucagon raises glucose while also increasing energy expenditure.
Characterization panels may add amino acid analysis for compositional confirmation, circular dichroism for secondary structure in solution, and light scattering for aggregation tendency. Aggregation is a central concern for peptides bearing hydrophobic side chains, since it can lower measured potency and complicate accurate dosing. Stability studies examine temperature, humidity, pH, and light exposure over defined intervals, reporting the percentage of intact peptide remaining. Results depend strongly on the assay used, so comparing values across studies requires matching method details.
Peptide content and purity are commonly measured by reversed-phase high-performance liquid chromatography with ultraviolet detection, using gradient elution over a C18 column. Identity is confirmed by mass spectrometry, because the theoretical monoisotopic mass allows unambiguous assignment of the main component. Impurity profiling resolves deletion sequences, oxidized residues, and truncated fragments. Since the molecule carries a lipophilic side chain, mobile phases often include ion-pairing agents and organic modifiers to keep peaks symmetric.
SPECULOOS-3 b, an exoplanet nearly identical in size to Earth, is discovered orbiting an ultracool dwarf star as small as Jupiter and located 55 light-years from Earth. Solar energy is combined with synthetic quartz to generate temperatures of more than 1,000°C. This proof-of-concept method shows the potential of clean energy to replace fossil fuels in heavy manufacturing, according to a research team at ETH Zurich. 16 May – A multimodal algorithm for improved sarcasm detection is revealed. Trained on a database known as MUStARD, it can examine multiple aspects of audio recordings and has 75% accuracy. 17 May – The world's smallest quantum light detector on a silicon chip is demonstrated, 50 times smaller than their previous version. 20 May – The first measurements of an exoplanet's core mass are obtained by the James Webb Space Telescope. This reveals a surprisingly low amount of methane and a super-sized core within the super-Neptune WASP-107b. 23 May New images from the Euclid space telescope are published, including a view of the Messier 78 star nursery. Astronomers using TESS report the discovery of Gliese 12 b, a Venus-sized exoplanet located 40 light-years away, with an equilibrium temperature of 315 K (42 °C; 107 °F). This makes it the nearest, transiting, temperate, Earth-sized world located to date. A team shows that iron instead of cobalt and nickel can be used as a cathode material in lithium-ion batteries, improving both safety and sustainability.
=== Industrial inorganic chemistry === Inorganic chemistry is a highly practical area of science. Traditionally, the scale of a nation's economy could be evaluated by their productivity of sulfuric acid. An important man-made inorganic compound is ammonium nitrate, used for fertilization. The ammonia is produced through the Haber process. Nitric acid is prepared from the ammonia by oxidation. Another large-scale inorganic material is portland cement. Inorganic compounds are used as catalysts such as vanadium(V) oxide for the oxidation of sulfur dioxide and titanium(III) chloride for the polymerization of alkenes. Many inorganic compounds are used as reagents in organic chemistry such as lithium aluminium hydride.
They were fought as both irregular warfare and conventional warfare. Some historians claim they began as localized civil wars that spread as secessionist wars for general independence. The new national boundaries followed the colonial provinces and formed the basis of contemporary Hispanic America. Cuba and Puerto Rico remained under Spanish rule until the 1898 Spanish–American War. The Spanish Empire dissolved in the region and new states emerged. The new republics abandoned the Inquisition and noble titles, but slavery was not immediately abolished, and total abolition came only in the 1850s in most countries. Criollos and mestizos replaced Spanish-born officials in most political offices, and Criollos stayed at the top of a social structure that kept traditional features culturally, if not legally. For almost a century, conservatives and liberals fought to reverse or deepen these changes. Spaniards were also subject to forced displacement, during the war and later through expulsion laws meant to consolidate independence. The wars followed the Haitian Revolution (1791–1804) and unfolded alongside Brazil's own path to independence. Spanish America and Brazil shared a trigger: Napoleon's invasion of Iberia, which in 1807 forced the Portuguese royal family to flee to Brazil. More broadly, they drew on the Enlightenment ideas of popular sovereignty behind the Atlantic Revolutions, including the American and French ones. The more direct cause was the crisis within Spain, which ended with new independent states in the post-Napoleonic world.
=== Cancer === According to a 1999 evaluation of the studies performed on progestin-only birth control by the International Agency for Research on Cancer, there is some evidence that progestin-only birth control reduces the risk of endometrial cancer. The IARC in 1999 concluded that there is no evidence progestin-only birth control increases the risk of any cancer, though the available studies were too small to be definitively conclusive. Progesterone is a hormone in the endometrium that counteracts estrogen driven growth. Very low levels of progesterone will cause estrogen to act more, leading to endometrial hyperplasia and adenocarcinoma. These effects can be minimized if treated with progestin, but not in very many cases. Estrogen and progesterone have an antagonistic relationship. Estrogen promotes the growing of endometrial lining, while progesterone limits it. In the case of endometrial cancer, progesterone can negatively regulate estrogen driven growth. Tumors formed are correlated with insufficient progesterone and excess estrogen. In patients with endometrial cancer who use progestin releasing IUDs concluded mixed results. A 2020 meta-analysis by Livia Conz et al. estimated that users of levonorgestrel-releasing systems had an increased breast cancer risk in general (with an odds ratio of 1.16) and higher risk for those over age 50 (odds ratio 1.52), and suggested balancing this risk against the known benefits of long-term use.
Sources: en.wikipedia.org
=== Awards received in the 1980s === Chairman, Gordon Research Conference on Analytical Chemistry; James B. Himes Merit Award of the Chicago Chromatography Discussion Group; M.S. Tswett Award and Medal in Chromatography; American Chemical Society Award in Chromatography; ISCO Award in Biochemical Instrumentation; Eastern Analytical Symposium Award in Chromatography; Chemical Instrumentation Award of the American Chemical Society; Distinguished Faculty Research Lecture, Indiana University.
In 1877 at Hooghly (near Kolkata), Herschel instituted the use of fingerprints on contracts and deeds, and he registered government pensioners' fingerprints to prevent the collection of money by relatives after a pensioner's death. In 1880, Henry Faulds, a Scottish surgeon in a Tokyo hospital, published his first paper on the subject in the scientific journal Nature, discussing the usefulness of fingerprints for identification and proposing a method to record them with printing ink. He established their first classification and was also the first to identify fingerprints left on a vial. Returning to the UK in 1886, he offered the concept to the Metropolitan Police in London, but it was dismissed at that time. Faulds wrote to Charles Darwin with a description of his method, but, too old and ill to work on it, Darwin gave the information to his cousin, Francis Galton, who was interested in anthropology. Having been thus inspired to study fingerprints for ten years, Galton published a detailed statistical model of fingerprint analysis and identification and encouraged its use in forensic science in his book Finger Prints. He had calculated that the chance of a "false positive" (two different individuals having the same fingerprints) was about 1 in 64 billion.
== Side effects == Side effects of vosilasarm in preliminary clinical studies in women with metastatic breast cancer have included vomiting (27%), dehydration (27%), constipation, decreased appetite and weight loss (27%), hypophosphatemia, decreased sex hormone-binding globulin (SHBG) levels (100%), increased prostate-specific antigen (PSA) levels (80%), and abnormal liver function tests, including elevated aspartate aminotransferase (59%), elevated alanine aminotransferase (46%), and elevated total blood bilirubin (27%). In gonadally intact male cynomolgus monkeys, vosilasarm suppressed testosterone levels by around 50% (from ~600–800 ng/dL to ~200–300 ng/dL) across three dose levels (0.01 mg/kg, 0.1 mg/kg, and 1.0 mg/kg). Changes in serum lipids, including of triglycerides, LDL cholesterol, and HDL cholesterol were also observed. Elevated liver enzymes were minimally observed in monkeys. A number of case reports of liver toxicity with non-medical use of vosilasarm have been published. A case report of acute myocarditis with non-medical use of vosilasarm also exists.
Aperture Hand Lab is a roomscale VR video game co-developed by Canadian studio Cloudhead Games and Valve, released free for Windows on June 25, 2019. It is a tech demo set in the Portal universe that showcases the functions of the hand, knuckle, and finger tracking technology used by the Valve Index.
This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2025, the most expensive non-synthetic element by mass is rhodium, and by volume, iridium. It is followed by rhodium, caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. While the difficulty of obtaining macroscopic samples of synthetic elements in part explains their high value, there has been interest in converting base metals to gold (chrysopoeia) since ancient times, but only deeper understanding of nuclear physics has allowed the actual production of a tiny amount of gold from other elements for research purposes as demonstrated by Glenn Seaborg. However, both this and other routes of synthesis of precious metals via nuclear reactions is orders of magnitude removed from economic viability. Chlorine, sulfur and carbon (as coal) are cheapest by mass. Hydrogen, nitrogen, oxygen and chlorine are cheapest by volume at atmospheric pressure. When there is no public data on the element in its pure form, price of a compound is used, per mass of element contained. This implicitly puts the value of compounds' other constituents, and the cost of extraction of the element, at zero. For elements whose radiological properties are important, individual isotopes and isomers are listed.
Sources: en.wikipedia.org
It is described as a single molecule that acts at three receptors: the glucose-dependent insulinotropic polypeptide receptor, the glucagon-like peptide-1 receptor, and the glucagon receptor. This triple activity distinguishes it from agents that target one or two of these pathways.
It is characterized in the literature as an investigational agent under clinical study. Approval status depends on jurisdiction, and readers should check current regulatory information rather than assume availability.
The combination is intended to pair appetite-related and glucose-related effects with mechanisms that increase energy expenditure. Whether the combined profile offers advantages over simpler agonists is the subject of ongoing research.
Reverse-phase liquid chromatography and mass spectrometry are the most common techniques. Chromatography assesses purity, while mass spectrometry confirms molecular identity. Additional methods may be applied when higher confidence is required.