K4 Elite
K4 Elite
Explore 80 peptides and the published research on their laboratory applications. Reference information for in-vitro research use only.
A small-molecule inhibitor of nicotinamide N-methyltransferase (NNMT) studied in laboratory models of adipocyte metabolism and cellular energy pathways.
Adalank is a synthetic derivative of the peptide Selank (a tuftsin-derived heptapeptide) described in secondary sources as an N-terminally acetylated, C-terminally amidated analog intended to improve stability. It is offered strictly for laboratory research and is studied in the context of GABAergic and BDNF-related signaling.
Adamax is a synthetic heptapeptide analog of Semax (itself an ACTH(4-7) fragment derivative) bearing an adamantane-type N-terminal modification intended to increase lipophilicity and resistance to enzymatic degradation. It is offered strictly for laboratory research and is studied in the context of neurotrophic and neuroplasticity signaling.
Adipotide is an experimental pro-apoptotic peptide-conjugate designed to target the vasculature of white adipose tissue, studied in preclinical animal models only.
A small-molecule anti-inflammatory compound and inhibitor of the non-canonical IKK-related kinases TBK1 and IKK-epsilon, studied in inflammation, metabolic, and mucosal-immunity research.
A modified fragment of human growth hormone (residues 176–191) studied in laboratory models of lipid metabolism and adipocyte activity.
An 11-amino-acid peptide derived from the tertiary structure of erythropoietin, designed to selectively engage the innate repair receptor without stimulating erythropoiesis; studied in tissue-protection and neuropathic-pain research.
A synthetic acetylated hexapeptide widely used as a cosmetic ingredient, modeled on the N-terminal sequence of SNAP-25 and studied for interference with SNARE-mediated neurotransmitter release — the basis of its reputation as a topical 'expression-line' peptide.
A synthetic pentadecapeptide derived from a partial sequence of human gastric juice protein, studied in preclinical models for its effects on tendon, ligament, muscle, and gastrointestinal tissue.
A research blend pairing BPC-157 with TB-500 (a thymosin beta-4 fragment), two peptides individually studied in preclinical models of wound healing, angiogenesis and musculoskeletal tissue repair. As a two-component mixture it has no single PubChem identifier or molecular formula.
Bromantane is an adamantane-derived compound developed in Russia and studied as an actoprotector with reported combined mild psychostimulant and anxiolytic properties in preclinical and clinical literature.
A long-acting amylin analog peptide studied in models of satiety signaling, food intake, and body weight, including combination research with GLP-1 agonists.
Cardiogen is a peptide bioregulator associated with cardiac-tissue research in the Khavinson short-peptide tradition, studied in preclinical and clinical-report settings for cardiovascular endpoints.
Cerebrolysin is a peptide preparation derived from purified porcine brain proteins, studied as a neuropeptide mixture with reported neurotrophic and neuroprotective activity in models of neurological injury and dementia.
A peptide-complex bioregulator derived from brain tissue, studied in Russian gerontology literature for proposed neuronal and geroprotective effects.
A peptide-complex bioregulator derived from bronchial and lung tissue, studied in Russian literature for proposed effects on respiratory-tissue function and mucosal immunity.
A long-acting growth-hormone-releasing hormone analog studied for extended stimulation of GH secretion via serum-albumin binding.
A short-peptide bioregulator originally derived from cerebral cortex tissue, studied in Russian gerontology and neuroscience literature for effects on neuronal function and cortical signaling.
Cortexin is a peptide complex extracted from the cerebral cortex of cattle, studied primarily in Russian-language neurological research as a neurotropic and neuroprotective preparation.
A naturally occurring cyclic dipeptide cleaved from the N-terminus of IGF-1 that regulates IGF-1 bioavailability by competing for IGFBP-3 binding, studied for neuroprotective and neurodevelopmental effects.
Dihexa is a small orally-active angiotensin IV-derived oligopeptide studied in preclinical models for its effects on synaptogenesis and hepatocyte growth factor (HGF)/c-Met signaling.
DSIP is a naturally occurring nonapeptide first isolated from mammalian brain, studied in research contexts related to sleep-associated electrophysiology and neuroendocrine and stress-response measures.
Epithalon is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) based on the pineal peptide epithalamin, studied in preclinical models for effects on telomerase activity, circadian regulation, and aging biomarkers.
A 39-amino-acid GLP-1 receptor agonist derived from exendin-4, studied for glucose-dependent insulin secretion, appetite signaling, and its resistance to enzymatic degradation.
A 344-amino-acid isoform of the endogenous glycoprotein follistatin, studied as a high-affinity antagonist of myostatin and other TGF-beta superfamily ligands in preclinical models of muscle and tissue biology.
FOXO4-DRI is a synthetic D-retro-inverso peptide engineered to disrupt the interaction between the transcription factor FOXO4 and p53, studied as a senolytic that selectively targets senescent cells. It is offered strictly for laboratory research.
GHK-Cu is a copper-binding tripeptide (glycyl-L-histidyl-L-lysine) complexed with copper(II), extensively studied in skin, hair, and wound-healing research and used as a cosmetic ingredient.
A synthetic growth hormone releasing peptide studied in models of GH secretion and used as a diagnostic research probe of pituitary function.
A synthetic growth hormone releasing hexapeptide studied in models of GH secretion, appetite signaling, and cytoprotection.
A research blend combining three individually studied peptides — BPC-157, TB-500 (thymosin beta-4 fragment), and the copper tripeptide GHK-Cu — investigated in the preclinical literature for tissue repair, angiogenesis, and skin remodeling pathways. Marketed as a fixed combination; no single PubChem identifier exists for the blend.
The native decapeptide gonadotropin-releasing hormone studied in models of pituitary gonadotropin secretion and reproductive-axis regulation.
A synthetic hexapeptide growth hormone secretagogue studied in models of GH release and cardiac tissue signaling.
Humanin is a 24-amino-acid mitochondrial-derived peptide encoded within the MT-RNR2 (16S rRNA) region, first identified for its cytoprotective and antiapoptotic activity. It is studied in the context of cellular stress resistance, metabolism, and neuroprotection, and is offered strictly for laboratory research.
A naturally occurring and synthetically produced truncated form of IGF-1 lacking the first three N-terminal amino acids (Gly-Pro-Glu), a deletion that sharply reduces IGF binding protein affinity and is studied as a highly potent IGF-1R agonist in vitro.
A synthetic 83-amino-acid analog of insulin-like growth factor 1, engineered with an N-terminal extension and an Arg substitution at position 3 to reduce binding to IGF binding proteins and extend its circulating half-life in research models.
A selective pentapeptide growth-hormone secretagogue studied for stimulating GH release through the ghrelin receptor with minimal effect on other hormones.
The 10-amino-acid active fragment of kisspeptin studied in models of GnRH neuron activation and reproductive axis regulation.
A research blend extending the GLOW combination with KPV, an alpha-MSH-derived tripeptide studied for anti-inflammatory activity. It combines BPC-157, TB-500, GHK-Cu and KPV — four separately studied peptides. As a mixture it has no single PubChem identifier or molecular formula.
KPV is a tripeptide (lysine-proline-valine) corresponding to the C-terminal fragment of alpha-melanocyte-stimulating hormone, studied preclinically for anti-inflammatory activity.
L-Glutathione (GSH) is the principal intracellular thiol antioxidant, a tripeptide of glutamate, cysteine, and glycine studied for its central roles in redox balance, detoxification, and cellular defense.
Larazotide is an investigational orally administered octapeptide studied as a tight-junction regulator (permeability modulator) of the intestinal epithelium, evaluated in celiac disease research.
A long-acting acylated analog of glucagon-like peptide-1 (GLP-1) studied for its effects on glucose homeostasis, appetite signaling, and body-weight regulation in laboratory and clinical research.
LL-37 is the only human cathelicidin-derived antimicrobial peptide, a 37-residue amphipathic host-defense peptide studied for its roles in innate immunity, microbial membrane disruption, and immunomodulation.
A lipidated matrikine cosmetic peptide (palmitoyl-KTTKS) derived from a fragment of type I collagen, studied for its ability to signal fibroblasts to increase extracellular-matrix synthesis. The palmitoyl group enhances skin penetration relative to the unmodified peptide.
Mazdutide is an investigational glucagon-like peptide-1 (GLP-1) receptor and glucagon receptor dual agonist derived from an oxyntomodulin-based scaffold, studied in clinical trials for metabolic endpoints.
A synthetic analog of alpha-melanocyte-stimulating hormone (alpha-MSH) that acts as a melanocortin-1 receptor agonist studied for its effects on eumelanin production. Afamelanotide is an FDA-approved active ingredient (Scenesse) for a rare photosensitivity condition; it is also widely encountered as a research peptide.
A cyclic melanocortin-receptor agonist peptide studied for its activation of melanocortin signaling and the melanogenesis pathway.
A splice variant of insulin-like growth factor 1 expressed in mechanically stressed and damaged muscle, whose unique C-terminal E-domain peptide is studied for roles in satellite-cell activation and early tissue-repair signaling.
MOTS-c is a 16-amino-acid mitochondrial-derived peptide studied for effects on metabolic homeostasis, insulin sensitivity, and exercise capacity through AMPK-related signaling in preclinical models.
A terminally modified analog of the ACTH(4-7)-derived heptapeptide Semax, with N-acetylation and C-amidation intended to increase stability, investigated for BDNF/TrkB pathway modulation and neuroplasticity in preclinical research.
NAD+ (nicotinamide adenine dinucleotide) is a fundamental coenzyme central to cellular energy metabolism and redox reactions, and a major focus of aging research due to its decline with age and role in sirtuin and PARP signaling.
NMN is a nucleotide precursor in the NAD+ biosynthesis pathway, extensively studied in aging and metabolism research for its role in restoring cellular NAD+ levels in preclinical models.
A synthetic proline-containing dipeptide nootropic developed in Russia as a cyclic analog of piracetam, studied in rodent and in vitro models for neuroprotective, BDNF/NGF-modulating, and memory-related effects.
A nine-amino-acid cyclic neuropeptide hormone produced in the hypothalamus, extensively studied for its roles in social behavior, bonding, uterine contraction, and milk ejection via the oxytocin receptor.
A small ciliary neurotrophic factor (CNTF)-derived peptide mimetic with an adamantylated residue for blood-brain-barrier penetration, studied in Alzheimer's-model animals for neurogenesis, BDNF induction, and reduction of tau and amyloid pathology.
A synthetic seven-amino-acid analog of the endogenous peptide spadin that inhibits the TREK-1 potassium channel, studied in rodent models for antidepressant-like effects and hippocampal neurogenesis.
Pentosan polysulfate is a semi-synthetic sulfated polysaccharide (a heparin-like glycosaminoglycan mimetic) studied in connective-tissue, joint, and urothelial research contexts.
A synthetic tripeptide bioregulator (Glu-Asp-Arg) from the Khavinson peptide-bioregulation program, studied in cell-culture and rodent models for neuroprotection against hypoxia and oxidative stress and for proposed gene-regulatory activity.
A peptide-complex bioregulator derived from prostate tissue, studied in Russian literature for proposed effects on prostate tissue function and related endocrine parameters.
A cyclic melanocortin-receptor agonist peptide studied for its central action on melanocortin signaling pathways.
A synthetic cell-penetrating peptide investigated in preclinical models for its ability to disrupt the CXXC5-Dishevelled (Dvl) interaction and de-repress Wnt/beta-catenin signaling in hair-follicle and wound-healing research.
An investigational triple agonist peptide targeting GIP, GLP-1, and glucagon receptors, studied in early metabolic and body-weight research.
Selank is a synthetic heptapeptide derived from the immunomodulatory peptide tuftsin, studied in Russia for anxiolytic and neuropsychological research applications.
A long-acting GLP-1 receptor agonist peptide widely studied in models of glucose regulation, appetite signaling, and energy metabolism.
Semax is a synthetic heptapeptide analogue of a fragment of adrenocorticotropic hormone (ACTH 4-10), studied in Russia for nootropic and neuroprotective research applications.
A 29-amino-acid growth-hormone-releasing hormone analog studied for its ability to stimulate endogenous GH secretion via the GHRH receptor.
A synthetic acetylated octapeptide used as a cosmetic ingredient, structurally based on the N-terminal region of SNAP-25 and studied for its proposed interference with SNARE-complex-mediated neurotransmitter release — a mechanism explored in the context of expression-line cosmetics.
SS-31 (elamipretide) is a synthetic, cell-permeable, mitochondria-targeting tetrapeptide that concentrates at the inner mitochondrial membrane and associates with cardiolipin. It has been evaluated in numerous preclinical studies and human clinical trials for mitochondrial dysfunction, and is offered strictly for laboratory research.
Survodutide (BI 456906) is an investigational GLP-1 receptor and glucagon receptor dual agonist peptide studied in clinical trials for metabolic and liver-related endpoints.
TB-500 is a synthetic peptide related to the actin-binding protein Thymosin Beta-4, studied preclinically for roles in cell migration, angiogenesis, and tissue repair.
A stabilized analog of growth-hormone-releasing hormone (GHRH) studied in models of the somatotropic axis and lipid distribution.
Tesofensine is an investigational small-molecule triple monoamine (serotonin, noradrenaline, dopamine) reuptake inhibitor studied in clinical trials for metabolic and body-weight endpoints.
Thymalin is a polypeptide complex extracted from the thymus gland, studied for immunomodulatory activity and for its influence on T-cell populations. It has been examined in Russian clinical and gerontological research and is offered strictly for laboratory research.
Thymogen is a synthetic dipeptide of glutamic acid and tryptophan, developed in the former USSR and studied as an immunomodulatory agent in experimental and clinical-report settings.
A 28-amino-acid thymic peptide studied for its immunomodulatory effects on T-cell maturation and innate immune signaling.
Thymulin is a zinc-dependent nonapeptide hormone secreted by thymic epithelial cells, studied for its roles in T-cell differentiation and neuroendocrine-immune signaling.
A dual GIP and GLP-1 receptor agonist peptide studied in models of glucose control, energy metabolism, and body weight regulation.
A long-acting GnRH agonist decapeptide studied in models of gonadotropin regulation and hypothalamic-pituitary-gonadal axis suppression.
Vesugen is a synthetic tripeptide bioregulator with the sequence Lys-Glu-Asp (KED), developed within the Khavinson peptide-bioregulation research program and studied for its reported influence on vascular endothelial cells. It is offered strictly for laboratory research.
A 28-amino-acid neuropeptide of the secretin/glucagon superfamily that acts as a potent vasodilator and immunomodulator, studied for roles in vascular tone, bronchodilation, and anti-inflammatory signaling.