Peptide Research Hub
Explore published research on peptide biology, tissue repair, inflammation and cellular metabolism. Each summary identifies the species and study design so readers can distinguish laboratory findings, animal experiments and human research. This educational library does not provide medical, veterinary or dosing advice.
Research additions reviewed: 16 October 2026
LATEST ACADEMIC BRIEF
Thymosin β4 & TB-500 Scientific Handbook
Explore the molecular biology, signalling pathways, tissue-repair research and published evidence surrounding thymosin β4 and TB-500. This 12-page educational handbook examines research relating to humans, horses, dogs and cats, together with current evidence, research limitations and competitive-sport considerations.
PDF • 12 pages • Educational scientific resource
Preliminary Equine Research Report
This preliminary report describes short-term observations in 11 adult horses receiving BPC-157 and TB-500 during controlled rehabilitation. The authors reported no observed adverse events during the study period. The small, uncontrolled design cannot establish general safety, clinical effectiveness or the frequency of uncommon adverse events. Peer-reviewed journal publication has not been verified.
PDF • Preliminary observational report
This preliminary observational report is provided for research context only and should not be interpreted as veterinary guidance, competition-clearance evidence or proof of clinical safety.
Equine Research Highlights
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Development of an LC/MS method for the detection of TB-500 (N-acetylated LKKTETQ) and its metabolites in equine plasma and urine
TB-500 contains the synthetic peptide LKKTETQ derived from thymosin β4 and is claimed to support wound healing and tissue repair. This study developed a sensitive LC/MS method to detect TB-500 and its metabolites in equine urine and plasma to control its misuse in equine sports.
EQUINE VETERINARY JOURNAL • 2002
Oral L-Carnitine Combined with Training Promotes Changes in Skeletal Muscle
This controlled equine study investigated whether L-carnitine supplementation influenced skeletal-muscle adaptation during training and detraining in seven two-year-old Standardbred horses. Four horses received L-carnitine while three served as controls, and all horses completed a structured treadmill-training programme. The researchers reported changes involving muscle carnitine concentrations, type-IIA muscle fibres, capillary-to-fibre measurements and glycogen-related muscle characteristics in the supplemented horses. The small sample size and combination of supplementation with exercise mean the results should not be presented as proof of improved racing performance or as general veterinary guidance.
SCIENTIFIC REPORTS • 2024
Adiposity in Mares Induces Insulin Dysregulation and Mitochondrial Dysfunction Which Can Be Mitigated by Nutritional Intervention
This study examined obesity, metabolic health and skeletal-muscle mitochondrial function in 19 older mares. Following the initial comparisons, seven obese mares received L-carnitine alone for six weeks. The researchers reported improved lipid-metabolism measurements, greater muscle oxidative capacity and reduced reactive oxygen species following L-carnitine supplementation. Insulin signalling did not significantly change during the L-carnitine phase. Because this phase involved only seven mares without a concurrent untreated control group, the findings should be presented as early equine metabolic research rather than proof of a clinical treatment or performance benefit.
Small Animal Research Highlights
The following summaries detail significant peer-reviewed papers involving small animal (canine and feline) models. These highlights explore pharmacological pathways, regenerative healing and metabolic studies relevant to veterinary peptide research.
Canine Research Highlights
AMERICAN JOURNAL OF VETERINARY RESEARCH • 1996
Effect of Locally Injected Medications on Healing of Pad Wounds in Dogs
This controlled experimental study examined full-thickness pad wounds in 12 mature English Pointers. Wounds received a tripeptide-copper complex containing glycyl-L-histidyl-L-lysine, commonly associated with GHK-Cu research, or a control treatment. Treated wounds showed increased type-I collagen during the healing period, with significantly greater type-I collagen reported in the tripeptide-copper group at day 14.
FRONTIERS IN PHARMACOLOGY • 2022
Pharmacokinetics, Distribution, Metabolism, and Excretion of Body-Protective Compound 157 in Rats and Dogs
This preclinical study investigated the absorption, circulation, metabolism and elimination of BPC-157 in laboratory rats and beagle dogs. The canine component provided species-specific pharmacokinetic and metabolite data following controlled administration. This was a compound-disposition study and should not be presented as evidence of clinical effectiveness or veterinary treatment outcomes.
REGULATORY TOXICOLOGY AND PHARMACOLOGY • 2020
Preclinical Safety Evaluation of Body Protective Compound-157, a Potential Drug for Treating Various Wounds
This preclinical toxicology study evaluated BPC-157 in mice, rats, rabbits and dogs. The researchers examined several areas of safety, including acute and repeated exposure, genetic toxicity and embryo-fetal development. The authors reported that BPC-157 was well tolerated and did not cause serious toxicity under the experimental conditions tested, including the canine component. This was a preclinical safety study and did not investigate clinical effectiveness or establish an approved veterinary treatment.
JOURNAL OF NUTRITIONAL SCIENCE • 2017
Utilisation of Supplemented L-Carnitine for Fuel Efficiency, as an Antioxidant, and for Muscle Recovery in Labrador Retrievers
Two controlled experiments examined L-carnitine supplementation in exercised Labrador Retrievers. Researchers measured activity, body composition and post-exercise biomarkers. The supplemented groups showed differences in activity intensity, lean-tissue measurements and markers associated with muscle stress and oxidative capacity. The findings relate specifically to the diets, exercise programmes and Labrador populations used in the study.
Feline Research Highlights
SCIENTIFIC REPORTS • 2024
Exogenous Oxytocin Increases Gaze to Humans in Male Cats
This controlled behavioural study investigated whether exogenous oxytocin influenced domestic cats’ social responses towards people. Male cats displayed increased gaze towards humans following oxytocin administration compared with the control condition. The findings contribute to research examining oxytocin signalling and human–cat social interaction, but they should not be interpreted as general veterinary treatment guidance.
JOURNAL OF VETERINARY INTERNAL MEDICINE • 2000
The Clinical and Metabolic Effects of Rapid Weight Loss in Obese Pet Cats and the Influence of Supplemental Oral L-Carnitine
This study evaluated privately owned obese cats participating in a controlled weight-reduction programme and examined the influence of supplemental L-carnitine. Cats receiving L-carnitine lost weight at a significantly faster rate in the reported study. The researchers also monitored clinical measurements, plasma metabolites and carnitine-related markers during the programme.
AMERICAN JOURNAL OF VETERINARY RESEARCH • 2012
Influence of Dietary Supplementation with L-Carnitine on Metabolic Rate, Fatty-Acid Oxidation, Body Condition, and Weight Loss in Overweight Cats
Thirty-two adult neutered cats were assigned to diets containing different concentrations of L-carnitine during a controlled weight-reduction study. Supplemented cats demonstrated changes in metabolic measurements associated with fatty-acid oxidation and resting energy expenditure relative to lean body mass. Overall weight loss was primarily driven by dietary restriction, and the study should not be presented as evidence that L-carnitine alone produces weight loss.
Scientific Disclaimer: The abstracts and studies presented here are curated from public peer-reviewed databases for educational purposes. Tetratide Labs does not endorse specific clinical outcomes and notes that research in small animal models may not translate directly to clinical feline or canine veterinary standards. These peptides remain strictly for laboratory research and are not approved for domestic or competition animal administration.
Veterinary Research Updates
DRUG TESTING AND ANALYSIS • 2025
Equine Doping Controls of Thymosin β4: A Population Study and Strategy for Misuse Detection
Horses • Analytical population study. Researchers investigated naturally occurring thymosin beta4 in racing-horse blood and methods for identifying exogenous material. Sample handling altered measured concentrations, and a synthetic impurity was detected after administration of a thymosin beta4-containing product. Study limitation: Analytical detection research; this did not test tendon repair, clinical benefit or long-term safety.
SCIENTIFIC REPORTS • 2024
A randomized, controlled clinical trial demonstrates improved owner-assessed cognitive function in senior dogs receiving a senolytic and NAD+ precursor combination
Dogs • Randomized, blinded, placebo-controlled combination trial. A study enrolling 70 senior dogs evaluated an oral senolytic and NAD-precursor combination. Owner-assessed cognitive scores improved more in the full-dose group over three months, but in-house cognitive testing and measured activity did not show significant between-group improvements. Study limitation: The combination design cannot isolate the precursor's contribution and does not establish benefits for injectable NAD+.
JOURNAL OF FELINE MEDICINE AND SURGERY • 2026
The hormonal effects of owner-cat interactions on pet cats of different potential attachment styles
Cats • Behaviour and hormone-measurement study, 20 cats. Salivary oxytocin and cortisol responses varied with owner-cat interaction type and potential attachment style. Passive interactions were associated with increased oxytocin and reduced cortisol, while forced interaction produced a different stress-response pattern. Study limitation: This measured endogenous hormones during interaction. It did not administer oxytocin or establish a treatment; the attachment classification has acknowledged limitations.
KPV Research Highlights
GASTROENTEROLOGY • 2008
PepT1-mediated tripeptide KPV uptake reduces intestinal inflammation
Cells and mice • Transport mechanisms and experimental colitis. This study examined KPV uptake through the PepT1 transporter in intestinal and immune cells and assessed anti-inflammatory effects in two mouse colitis models. It provides a mechanistic foundation for investigating KPV in intestinal inflammation. Study limitation: Cell and induced-disease findings do not establish clinical effects in horses, dogs, cats or humans.
MOLECULAR THERAPY • 2017
Orally Targeted Delivery of Tripeptide KPV via Hyaluronic Acid-Functionalized Nanoparticles Efficiently Alleviates Ulcerative Colitis
Cells and mice • Engineered oral nanoparticle/hydrogel formulation. KPV was incorporated into hyaluronic acid-functionalised nanoparticles within a hydrogel. In a mouse colitis model, the targeted system reduced inflammatory signalling and mucosal damage more effectively than the comparison nanoparticle system. Study limitation: Findings concern a specialised carrier system and cannot be transferred directly to a standard KPV vial or another administration route.
SCIENCE ADVANCES • 2026
Inflammation-triggered self-immolative conjugates enable oral peptide delivery by overcoming gastrointestinal barriers
Mice • Engineered oral prodrug delivery. An inflammation-responsive carrier linked to KPV increased accumulation in inflamed colon tissue and improved experimental outcomes compared with free KPV in mice. Researchers also investigated other peptides and an acute lung-injury model. Study limitation: The advantages belong to an engineered conjugate, not ordinary KPV. Authors disclose a related pending patent.
BPC-157 & GHK-Cu Research
JOURNAL OF APPLIED PHYSIOLOGY • 2011
The promoting effect of pentadecapeptide BPC 157 on tendon healing involves tendon outgrowth, cell survival, and cell migration
Rat tendon explants and cells • Mechanistic study. BPC-157 increased tendon-explant outgrowth, fibroblast migration and cell survival under oxidative stress. FAK-paxillin signalling changes were associated with these effects. Study limitation: Rat-derived tissue and cell research, not an equine tendon-treatment or clinical rehabilitation trial.
FRONTIERS IN PHARMACOLOGY • 2025
Exploring the beneficial effects of GHK-Cu on an experimental model of colitis and the underlying mechanisms
Mice and cell co-cultures • Experimental colitis and barrier function. Researchers reported reduced inflammatory injury and improved intestinal-barrier measurements with GHK-Cu in a mouse colitis model. Cell experiments and pathway analyses investigated SIRT1/STAT3 signalling as a possible contributor. Study limitation: The model was short-term and used a single dose level. Computational target predictions do not definitively establish direct binding or clinical effectiveness.
OTOLARYNGOLOGY–HEAD AND NECK SURGERY • 2013
Effects of topical copper tripeptide complex on wound healing in an irradiated rat model
Rats • Controlled topical GHK-Cu study, null result. Topical GHK-Cu did not significantly improve measured ischemia, blood-vessel or VEGF outcomes in an irradiated rat skin-flap model compared with control treatment. Study limitation: Results show that findings vary by experimental setting. A null result in this model does not prove every GHK-Cu application ineffective.
Metabolic & Human Research
FRONTIERS IN PHARMACOLOGY • 2020
Subacute Toxicity Study of Nicotinamide Mononucleotide via Oral Administration
Mice and beagle dogs • Short-term oral NMN toxicology. A short-term study evaluated oral NMN in mice and beagle dogs. The canine experiment included 10 dogs over 14 days and reported mild increases in creatinine and uric acid among the measured changes. Study limitation: Limited-duration toxicology for an NAD+ precursor; not evidence for injectable NAD+ safety, longevity or clinical benefit.
ANNALS OF THE NEW YORK ACADEMY OF SCIENCES • 2010
The effect of thymosin treatment of venous ulcers
Humans • Phase 2 double-blind, placebo-controlled study, 73 patients. A phase 2 trial evaluated topical full-length thymosin beta4 in patients with venous stasis ulcers. Safety findings were comparable with placebo, and the authors reported an exploratory wound-healing signal at one tested concentration. Study limitation: Topical 43-amino-acid thymosin beta4 findings do not establish effects for TB-500 fragments, injectable products or veterinary use.
NATURE COMMUNICATIONS • 2021
MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis
Mice and human observations • Experimental intervention and exercise biology. Experimental MOTS-c administration improved physical-performance measures in mice. A separate human exercise component found increases in naturally occurring MOTS-c in muscle and circulation. Study limitation: The human component did not test MOTS-c treatment; mouse findings do not establish effects in horses, dogs or cats.