nitric oxide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-07-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
Doses in the literature are usually expressed in micrograms or nanograms per kilogram of body weight. Investigators have administered the peptide by several routes, including injection and oral delivery, depending on the question asked. Route and dose vary widely across studies, which complicates direct comparison of results. Many papers report effects at low doses, but the absence of a standardized protocol limits generalization. Reporting practice differs between research groups.
Some properties, such as the peptide's sequence and molecular mass, are firmly established. Other claims, particularly about mechanism and clinical benefit, remain open questions. Proposed mechanisms include effects on nitric oxide signaling and on cell migration, but these are hypotheses supported by limited evidence. Reviewers often note that the field lacks large controlled human trials. Positive animal findings are best treated as signals for further study rather than as settled conclusions.
Most published studies examine BPC-157 in animal models rather than in humans. Common subjects include rats and mice, and researchers often use models of tissue injury, surgery, or induced inflammation. Reported endpoints include healing rates, blood vessel formation, and markers of tissue repair. These designs provide controlled comparisons, but findings in animals do not automatically transfer to people. Human clinical data remain limited and are frequently described as preliminary.
Evidence in humans is limited. Small clinical studies have examined the peptide in contexts such as ulcerative colitis and wound healing, but participant numbers are small and independent replication is scarce. It is not approved as a medicine by major regulatory agencies and is distributed mainly as a research material or compounded preparation. Long-term human safety data are not established, and questions about absorption through non-injected routes remain open rather than resolved. Claims about its effects are best read against these gaps.
BPC-157 is a synthetic peptide of fifteen amino acids, written in single-letter code as GEPPPGKPADDAGLV. The sequence corresponds to a partial fragment of a protein isolated from human gastric juice, described in early reports as body protection compound. The number 157 refers to a fragment designation in that work rather than to molecular mass. Initial descriptions appeared in the early 1990s, when the fragment was reported to protect gastrointestinal tissue in animal models. Commercial material is produced by solid-phase peptide synthesis rather than extracted from biological sources.
| Property | Value | Notes |
|---|---|---|
| Typical subjects | Rats and mice | Animal models |
| Common routes | Injection and oral | Route varies by study |
| Reported dose range | Microgram to milligram per kg | Not standardized across work |
| Frequent endpoints | Tissue repair, angiogenesis | Marker-dependent |
| Human evidence | Limited | Mostly small or preliminary studies |
The peptide was first described in the early 1990s by a group studying gastric secretions and tissue repair. Its fifteen-residue chain is usually written as GEPPPGKPADDAGLV in single-letter code. The free peptide has the formula C62H98N16O22 and a theoretical mass near 1419.5 daltons. These identifiers are established chemical facts that can be checked against standard peptide databases. There is no ambiguity about the primary structure.
Most published findings come from rodent experiments using induced injury or surgical models. Human reports remain scarce and are largely observational, which limits how much can be stated with confidence. Questions about absorption, distribution, metabolism, and clearance in people are still open. Dose translation between species is likewise unresolved. Researchers tend to read the animal literature as a starting point rather than a settled account.
Peptides are susceptible to hydrolysis, oxidation, and aggregation, and BPC-157 is no exception. The lyophilized powder form is generally more stable than a solution because residual moisture is low and molecular mobility is reduced. Once dissolved, the peptide is exposed to water, oxygen, and trace metal ions that accelerate degradation. Light exposure and repeated freeze-thaw cycles are also commonly cited as sources of loss. These general principles guide most handling recommendations found in supplier documentation.
Standard practice for the solid form is storage at minus twenty degrees Celsius or colder, kept dry and away from light. Containers are usually sealed with a desiccant to limit moisture uptake. Reconstituted solutions are typically held at two to eight degrees Celsius and used within a short window, because potency can decline over days to weeks depending on the buffer and concentration. Freezing an already dissolved sample may help, though repeated thawing is discouraged. Specific shelf-life claims vary between suppliers and are rarely supported by published stability studies.
BPC-157 is a synthetic pentadecapeptide, meaning it consists of fifteen amino acids joined in a single chain. Its sequence is Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val, a fragment corresponding to part of a larger protein found in human gastric juice. The peptide was first described in the 1990s by researchers in Zagreb who were studying gastric protective factors. It is not a naturally circulating hormone; it is a laboratory-made fragment derived from a stomach protein. The name is an abbreviation of body protection compound, with the number referring to the fragment's position in the source protein.
Most published work on BPC-157 comes from animal experiments rather than controlled human trials. Rodent models have examined its effects on gastrointestinal lesions, tendon and ligament injury, and blood vessel formation. These studies are often small and originate from a limited number of research groups, which affects how broadly the findings can be generalized. No large randomized human trial has been reported in the peer-reviewed literature. Discussion of the compound therefore rests largely on preclinical data, and questions about its effects in people remain open rather than settled.
Several mechanisms have been proposed to explain the activity observed in animal models. The most frequently cited involve signaling through vascular endothelial growth factor receptor 2 and modulation of the nitric oxide system. Researchers have also described interactions with protective pathways in the gut lining. These proposed mechanisms appear in the literature as hypotheses supported by preclinical observations, not as confirmed pathways in humans. The precise way the peptide produces its reported effects, and whether those effects carry across species, remain areas of active and unresolved investigation.
Human data are far more limited than animal data. A small number of clinical reports exist, generally with few participants and without the randomization or blinding expected in later-phase trials. No large, independently replicated human trial has appeared in the indexed peer-reviewed literature. Statements about effects in people therefore rest on extrapolation from animal work rather than on direct evidence, and the strength of that extrapolation remains an open question rather than a settled matter.
Proposed mechanisms include interaction with the nitric oxide system, modulation of growth factor signaling, and effects on blood vessel formation. None of these has been established as the primary mode of action, and some proposed pathways rest on indirect measurements. Whether the reported effects depend on a specific receptor has not been determined. Stability in gastric acid, unusual for a peptide of this size, is also reported in animal work, but the reason for it is not firmly established.
On 26 January 2016, having still not started a league match, Tottenham agreed a transfer fee with Newcastle United for Townsend, reportedly £12 million. Before the fee had been announced, Townsend had already tweeted a goodbye message, and stated "As soon as I knew of Newcastle's interest they were the only club I wanted to join...Two of the best positions you can play in football are centre-forward and left wing at Newcastle. I've got the chance. I could never turn that down. I can't wait to play my first game at St James' Park". The transfer was confirmed the following day, a five-and-a-half-year contract but with the club declining to disclose the fee. On signing, his new manager, Newcastle head coach Steve McClaren, said of Townsend that he is a "winger with an old-fashioned style. He can play on the right or the left, is two-footed, quick, very direct and loves taking on defenders and crossing the ball." According to Sky Sports, the transfer had been under negotiation for a week and Newcastle had initially wanted Townsend on loan, and then had a transfer offer of £10.5m rejected. Despite his debut for Newcastle being in a disappointing team performance in an away defeat, at the next match, his home debut, he was given a standing ovation after a Man of the Match performance which saw Newcastle climb out of the relegation places. His first goal for the club came in his third match, a shot from just outside the area, but it was just a 90th minute consolation goal in a 5–1 away defeat to Chelsea and the club was relegated to the Championship at the end of the season.
where Mej is the mass of ejected material. Assuming the intercepted material is distributed uniformly across the surface of the Earth (4πR 2Earth ), the mass surface density (Σej) of the supernova ejecta on Earth is:
Respect the dignity of individual people Connect with other people sincerely, openly, and inclusively Care for the wellbeing of everyone Protect social values, justice, and the public interest Other developments in ethical frameworks include those decided upon during the Asilomar Conference, the Montreal Declaration for Responsible AI, and the IEEE's Ethics of Autonomous Systems initiative, among others; however, these principles are not without criticism, especially regarding the people chosen to contribute to these frameworks. Promotion of the wellbeing of the people and communities that these technologies affect requires consideration of the social and ethical implications at all stages of AI system design, development and implementation, and collaboration between job roles such as data scientists, product managers, data engineers, domain experts, and delivery managers. The UK AI Safety Institute released in 2024 a testing toolset called 'Inspect' for AI safety evaluations available under an MIT open-source licence which is freely available on GitHub and can be improved with third-party packages. It can be used to evaluate AI models in a range of areas including core knowledge, ability to reason, and autonomous capabilities.
A study on the evolution of incisors of Eocene-Oligocene muroid rodents from Balkanatolia is published by van de Weerd et al. (2026). Lopatin (2026) describes fossil material of members of the family Platacanthomyidae from the Pleistocene strata from Vietnam, including the first known fossil material of the Chapa pygmy dormouse and Typhlomys taxuansis. Rico & Terry (2026) identify skull traits that are best predictors of body length and weight of pack rats and reconstruct the evolution of body size of pack rats from the Paisley Caves (Oregon, United States) throughout the past 15,000 years. Baca et al. (2026) reconstruct the evolutionary history of the field vole species complex based on data from modern mitogenomes and nuclear genomes and from ancient genomes of specimens spanning the last 75,000 years. Alfaro-Ibáñez et al. (2026) study mitochondrial genomes of Pleistocene tundra voles from the El Mirón Cave (Spain), and identify a novel, extinct southern European haplogroup within this species. Evidence from the study of molars of Stenocranius anglicus (European narrow-headed vole) from Middle Pleistocene to Holocene localities in Czech Republic and Slovakia, indicative of more pronounced morphological variation between populations from different sites than between stratigraphic stages and of long-term survival of the species in isolated populations, is presented by Dubjelová et al. (2026). Desclaux et al.
== Diagnosis == Perichondral hematoma and consequently cauliflower ear are diagnosed clinically. This means that the medical provider will make the diagnosis by using elements of the history of the injury (examples: participation in contact sports, trauma to the ear, previous similar episodes) and combine this with findings on physical exam (examples: tenderness to the area, bruising, deformation of the ear contours) to confirm the diagnosis and decide on the appropriate treatment for the patient.
Sources: en.wikipedia.org
trend predicted for rigid elastic spheres. Indeed, the Chapman–Enskog analysis shows that the predicted temperature dependence can be tuned by varying the parameters in various molecular models. A simple example is the Sutherland model, which describes rigid elastic spheres with weak mutual attraction. In such a case, the attractive force can be treated perturbatively, which leads to a simple expression for
== Nomenclature == In addition to the IUPAC numbering system to differentiate the various carbons in an organic molecule, by sequentially assigning a number to each carbon, including those forming a carboxylic group, the carbons along the side-chain of amino acids can also be labelled with Greek letters, where the α-carbon is the central chiral carbon possessing a carboxyl group, a side chain and, in α-amino acids, an amino group – the carbon in carboxylic groups is not counted. (Consequently, the IUPAC names of many non-proteinogenic α-amino acids start with 2-amino- and end in -ic acid.)
Most charts or tables indicate the type of friction factor, or at least provide the formula for the friction factor with laminar flow. If the formula for laminar flow is f = 16/Re, it is the Fanning factor f, and if the formula for laminar flow is fD = 64/Re, it is the Darcy–Weisbach factor fD. Which friction factor is plotted in a Moody diagram may be determined by inspection if the publisher did not include the formula described above:
These included the explosion of Air India Flight 182 in 1985, the largest mass murder in Canadian history; the École Polytechnique massacre in 1989, a university shooting targeting female students; and the Oka Crisis of 1990, the first of a number of violent confrontations between provincial governments and Indigenous groups. Canada joined the Gulf War in 1990 and was active in several peacekeeping missions in the 1990s, including operations in the Balkans during and after the Yugoslav Wars, and in Somalia, resulting in an incident that has been described as "the darkest era in the history of the Canadian military". After the September 11 attacks in the United States, Canada sent troops to Afghanistan in 2001, resulting in the largest amount of Canadian deaths for any single military mission since the Korean War in the early 1950s. In 2011, Canadian forces participated in the NATO-led intervention into the Libyan Civil War and also became involved in battling the Islamic State insurgency in Iraq in the mid-2010s. The COVID-19 pandemic in Canada began on January 27, 2020, causing widespread social and economic disruption. A trade war involving the United States began on February 1, 2025, when U.S. president Donald Trump signed orders imposing tariffs on goods entering the United States, alongside rhetoric suggesting the annexation of Canada.
Sources: en.wikipedia.org
The measured value of the deuterium magnetic dipole moment, is 0.857 μN, which is 97.5% of the 0.879 μN value obtained by simply adding moments of the proton and neutron. This suggests that the state of the deuterium is indeed to a good approximation s = 1, l = 0 state, which occurs with both nucleons spinning in the same direction, but their magnetic moments subtracting because of the neutron's negative moment. But the slightly lower experimental number than that which results from simple addition of proton and (negative) neutron moments shows that deuterium is actually a linear combination of mostly s = 1, l = 0 state with a slight admixture of s = 1, l = 2 state. The electric dipole is zero as usual. The measured electric quadrupole of the deuterium is 0.2859 e·fm2. While the order of magnitude is reasonable, since the deuteron radius is of order of 1 femtometer (see below) and its electric charge is e, the above model does not suffice for its computation. More specifically, the electric quadrupole does not get a contribution from the l = 0 state (which is the dominant one) and does get a contribution from a term mixing the l = 0 and the l = 2 states, because the electric quadrupole operator does not commute with angular momentum. The latter contribution is dominant in the absence of a pure l = 0 contribution, but cannot be calculated without knowing the exact spatial form of the nucleons wavefunction inside the deuterium. Higher magnetic and electric multipole moments cannot be calculated by the above model, for similar reasons.
=== Pharmacodynamics === NBOMe-LAD is known to act as an agonist of the serotonin 5-HT2A receptor and to interact with other receptors, but shows dramatically reduced potency compared to LSD in vitro. At the serotonin 5-HT2A receptor, it had 37-fold lower affinity, 148-fold lower activational potency in terms of calcium release, and around half the maximal efficacy in terms of calcium release relative to LSD. On the other hand, NBOMe-LAD had only about 4-fold lower potency in terms of β-arrestin recruitment along with similar activational efficacy for this pathway relative to LSD. NBOMe-LAD produces the head-twitch response, a behavioral proxy of psychedelic effects, in rodents, but with greatly reduced potency and maximal efficacy relative to PRO-LAD and analogues. Its ED50Tooltip median effective dose for inducing the head-twitch response was 13-fold lower than that of PRO-LAD and its maximal effect was about one-third that of PRO-LAD. However, the most efficacious dose of NBOMe-LAD was 3.2 mg/kg whereas that of PRO-LAD was 1 mg/kg.
==== 2009–2015 ==== The JWP published its report on elements 113–116 and 118 in 2011. It recognised the JINR–LLNL collaboration as having discovered elements 114 and 116, but did not accept either team's claim to element 113 and did not accept the JINR–LLNL claims to elements 115 and 118. The JINR–LLNL claim to elements 115 and 113 had been founded on chemical identification of their daughter dubnium, but the JWP objected that current theory could not distinguish between superheavy group 4 and group 5 elements by their chemical properties with enough confidence to allow this assignment. The decay properties of all the nuclei in the decay chain of element 115 had not been previously characterised before the JINR experiments, a situation which the JWP generally considers "troublesome, but not necessarily exclusive", and with the small number of atoms produced with neither known daughters nor cross-reactions the JWP considered that their criteria had not been fulfilled. The JWP did not accept the Riken team's claim either due to inconsistencies in the decay data, the small number of atoms of element 113 produced, and the lack of unambiguous anchors to known isotopes. In early 2009, the Riken team synthesised the decay product 266Bh directly in the 248Cm + 23Na reaction to establish its link with 278113 as a cross-bombardment. They also established the branched decay of 262Db, which sometimes underwent spontaneous fission and sometimes underwent the previously known alpha decay to 258Lr.
Sources: en.wikipedia.org
Human data are limited. Most evidence comes from animal experiments and from small or uncontrolled reports. The absence of large trials means clinical effects and safety are not firmly established.
Frequently measured outcomes include wound healing, blood vessel growth, and tissue repair markers. Some work examines gastrointestinal protection. The choice of endpoint depends on the model used.
Different routes of administration and different animal models require different amounts. Studies also use varied timelines and measurement methods. This variation makes it difficult to combine results into a single standardized figure.
It is a synthetic fifteen-amino-acid peptide whose sequence matches part of a protein found in human gastric juice. It is made by chemical synthesis, not purified from tissue. The name derives from an early fragment label, not from a molecular weight.