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  • GLP-3 (Retatrutide) Research Guide: Triple Agonist, Metabolic Pathways & Preclinical Studies (2026)

    Research Use Only. GLP-3 (Retatrutide) is a research peptide intended strictly for laboratory and scientific use. Not approved for human consumption or therapeutic application.

    What is GLP-3 (Retatrutide)?

    GLP-3, sold at Peppy University under its research designation, is the compound widely known in clinical research as Retatrutide — a next-generation triple agonist peptide developed by Eli Lilly currently in Phase 3 TRIUMPH trials as of 2026. Unlike semaglutide (GLP-1 only) and tirzepatide (GLP-1 + GIP dual agonist), GLP-3 simultaneously targets three metabolic receptors: GLP-1, GIP, and glucagon — making it the most advanced GLP peptide studied to date for metabolic research.

    Phase 2 trial data published in JAMA showed Retatrutide produced a mean body weight reduction of 24.2% at 48 weeks at the 12mg dose — surpassing both semaglutide (~15%) and tirzepatide (~20-22%) in head-to-head metabolic endpoints. Continuous weight loss through 48 weeks was observed with no plateau, a result that has driven significant interest in the research community.

    GLP-3 vs Semaglutide vs Tirzepatide

    Understanding where GLP-3 (Retatrutide) sits in the GLP peptide landscape is essential for research protocol design:

    • Semaglutide (GLP-1 agonist) — targets GLP-1 receptor only. Drives insulin secretion, appetite suppression, and gastric motility. ~15-17% average weight reduction in trials.
    • Tirzepatide (GLP-1/GIP dual agonist) — targets GLP-1 + GIP receptors. Enhanced insulin response and adipose tissue signaling. ~20-22% average weight reduction in trials.
    • GLP-3 / Retatrutide (GLP-1/GIP/Glucagon triple agonist) — targets all three receptors. Adds glucagon receptor activation which increases energy expenditure and drives hepatic fat oxidation. ~24.2% average weight reduction in Phase 2 trials.

    GLP-3 (Retatrutide) in Preclinical & Clinical Research

    • Triple receptor agonism — Retatrutide simultaneously activates GLP-1, GIP, and glucagon receptors, offering a uniquely broad metabolic signaling profile for laboratory investigation.
    • Body composition studies — Phase 2 data showed continuous, unplateaued weight loss through 48 weeks, with dose-dependent responses across 0.5mg, 4mg, 8mg, and 12mg weekly protocols.
    • Hepatic fat reduction — The glucagon component drives hepatic fat oxidation pathways not activated by GLP-1 or GIP alone, relevant to NAFLD and metabolic liver disease research models.
    • Glucose and insulin regulation — Research has documented Retatrutide’s effects on fasting glucose, postprandial glucose, HbA1c, and insulin sensitivity in metabolic dysfunction models.
    • Cardiovascular pathways — Emerging research examines GLP-1/GIP/glucagon receptor expression in cardiac tissue and potential cardioprotective signaling mechanisms.
    • Lean mass preservation — Early data on lean mass preservation during weight loss protocols has generated significant interest compared to GLP-1-only compounds.

    Why GLP-3 Over Semaglutide or Tirzepatide for Research?

    For researchers designing metabolic studies in 2026, GLP-3 (Retatrutide) offers several research advantages over single or dual agonists:

    • Enables investigation of glucagon receptor contributions to metabolic outcomes — a pathway not accessible with semaglutide or tirzepatide protocols alone
    • Allows study of triple vs dual vs single agonist comparative endpoints within the same research framework
    • More aggressive metabolic effects provide cleaner signal differentiation in body composition and glucose metabolism models
    • As an investigational compound not yet FDA-approved, GLP-3 remains available for research-grade laboratory procurement without the supply constraints affecting compounded semaglutide and tirzepatide

    Molecular Profile

    • Mechanism: GLP-1/GIP/Glucagon triple receptor agonist
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protected from light and moisture
    • Reconstitution: Bacteriostatic water or sterile saline

    Sourcing GLP-3 (Retatrutide) for Research

    Peppy University supplies GLP-3 in two research sizes:

    • GLP-3 10mg — ideal for initial protocol testing and dose-response studies
    • GLP-3 30mg — best value for extended research protocols

    Both available with 99% purity, HPLC verified, and full research documentation. Also available as part of the Metabolic Stack combined with Tesamorelin 10mg and Reconstitution Solution.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Dihexa Research Guide: Cognitive Enhancement, Neurogenesis & Memory Studies (2026)

    Research Use Only. Dihexa is a research compound intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is Dihexa?

    Dihexa (N-hexanoic-Tyr-Ile-(6) aminohexanoic amide) is a small peptide derived from Angiotensin IV, developed by researchers at Washington State University. It has been studied in preclinical research for its remarkable potency in cognitive enhancement, synaptogenesis, and neurological repair models — reported to be millions of times more potent than BDNF in certain hippocampal synaptogenesis assays.

    Dihexa in Preclinical Research

    • Synaptogenesis — Preclinical data demonstrates Dihexa’s ability to promote new synapse formation through hepatocyte growth factor (HGF) and its receptor c-Met, critical pathways in learning and memory research.
    • Cognitive function in aging models — Research in rodent models of cognitive decline has shown significant improvements in spatial memory and learning tasks following Dihexa administration.
    • Neurological repair — Studies have explored Dihexa’s potential in neurodegenerative disease models, examining its effects on neuronal survival and plasticity.
    • HGF/c-Met pathway — Dihexa’s primary mechanism involves potentiating HGF activity, which regulates neuronal growth, survival, and differentiation.

    Molecular Profile

    • Molecular Formula: C₂₄H₃₉N₃O₄
    • Molecular Weight: 437.58 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, dry and dark conditions

    Sourcing Dihexa for Research

    Shop Dihexa 10mg at Peppy University — one of the most studied nootropic peptides in preclinical research, supplied at 99% purity with full HPLC documentation.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Semax Research Guide: Neuroprotection, Cognitive Enhancement & CNS Studies (2026)

    Research Use Only. Semax is a research peptide intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is Semax?

    Semax is a synthetic heptapeptide based on the ACTH(4-7) fragment — Met-Glu-His-Phe-Pro-Gly-Pro. Developed in Russia, it has been studied for its potential effects on neuroprotection, cognitive enhancement, BDNF regulation, and central nervous system recovery in preclinical models.

    Semax in Preclinical Research

    • BDNF upregulation — Preclinical studies have shown Semax significantly increases brain-derived neurotrophic factor (BDNF) and its receptor TrkB expression in rat hippocampal models.
    • Neuroprotection — Research in ischemia models has explored Semax’s potential to reduce neuronal damage and support brain recovery following oxygen deprivation.
    • Cognitive function — Animal studies have examined Semax’s effects on memory formation, learning capacity, and attention in maze and behavioral research models.
    • Dopamine system modulation — Research has explored Semax’s interaction with dopaminergic pathways and its potential effects on motivation and reward circuitry.
    • Anti-inflammatory CNS effects — Studies have investigated Semax’s role in modulating neuroinflammatory markers in CNS injury models.

    Molecular Profile

    • Sequence: Met-Glu-His-Phe-Pro-Gly-Pro
    • Molecular Formula: C₃₇H₅₁N₉O₁₀S
    • Molecular Weight: 813.92 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, away from light and moisture

    Sourcing Semax for Research

    Shop Semax 10mg at Peppy University with 99% purity, HPLC verified, and full research documentation.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Selank Research Guide: Anxiolytic Pathways, Cognitive Function & Nootropic Studies (2026)

    Research Use Only. Selank is a research peptide intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is Selank?

    Selank is a synthetic heptapeptide analog of the human tetrapeptide tuftsin (Thr-Lys-Pro-Arg), developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. In preclinical research, Selank has been studied for its potential effects on anxiety pathways, cognitive function, immune modulation, and neuroprotection.

    Selank in Preclinical Research

    • Anxiolytic pathways — Selank has been studied in animal models for its interaction with GABA-A receptor systems and its potential anxiolytic effects without sedative properties.
    • Cognitive enhancement — Research has explored Selank’s effects on brain-derived neurotrophic factor (BDNF) expression and memory consolidation pathways in rodent models.
    • Immune modulation — As a tuftsin analog, Selank has been studied for its effects on T-cell activity, NK cell function, and cytokine regulation.
    • Enkephalin metabolism — Preclinical data suggests Selank may inhibit enkephalin-degrading enzymes, potentially modulating endogenous opioid signaling pathways.
    • Stress response — Studies have examined Selank’s effects on HPA axis activity and corticosterone levels in stress model research.

    Molecular Profile

    • Sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro
    • Molecular Formula: C₃₃H₅₇N₁₁O₉
    • Molecular Weight: 751.87 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, dark, dry conditions

    Sourcing Selank for Research

    Shop Selank 10mg at Peppy University — third-party tested, 99% purity with full documentation for laboratory research use.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Semaglutide Research Guide: GLP-1 Receptor Agonism, Metabolic Pathways & Preclinical Studies (2026)

    Research Use Only. Semaglutide is a research peptide intended strictly for laboratory and scientific use. Not approved for human consumption or therapeutic application outside of authorized clinical settings.

    What is Semaglutide?

    Semaglutide is a GLP-1 receptor agonist — a synthetic analog of the naturally occurring glucagon-like peptide-1 hormone. In preclinical and clinical research, it has been studied for its effects on insulin secretion, glucagon suppression, gastric motility, and appetite regulation pathways. It is one of the most studied peptides in the metabolic research space.

    Semaglutide in Preclinical Research

    • GLP-1 receptor binding — Semaglutide binds GLP-1 receptors with high affinity, stimulating insulin secretion in a glucose-dependent manner. Its extended half-life makes it a preferred research analog for sustained GLP-1 pathway studies.
    • Appetite and energy regulation — Preclinical models have examined Semaglutide’s effects on hypothalamic appetite centers and energy homeostasis pathways.
    • Glucose metabolism — Research has extensively documented Semaglutide’s effects on fasting and postprandial glucose levels in rodent and primate models.
    • Cardiovascular research — Studies have explored GLP-1 receptor signaling in cardiac tissue and its potential cardioprotective effects in metabolic dysfunction models.
    • Neurological pathways — Emerging research is investigating GLP-1 receptor expression in the central nervous system and potential neuroprotective mechanisms.

    Molecular Profile

    • Molecular Weight: 4113.58 g/mol (5mg) / 4113.58 g/mol (10mg)
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protect from light and moisture

    Sourcing Semaglutide for Research

    Peppy University supplies Semaglutide in two research sizes — Semaglutide 5mg and Semaglutide 10mg — with 99% purity and full HPLC documentation for reproducible laboratory results.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Tesamorelin Research Guide: Growth Hormone, Metabolic Regulation & Body Composition Studies (2026)

    Research Use Only. Tesamorelin is a research peptide intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is Tesamorelin?

    Tesamorelin is a synthetic analog of Growth Hormone-Releasing Hormone (GHRH) consisting of the full 44-amino-acid sequence with a trans-3-hexenoic acid modification that enhances stability. In preclinical and clinical research, it has been studied extensively for its role in growth hormone secretion, visceral fat reduction, and metabolic regulation.

    Tesamorelin in Research

    • GH secretion pathways — Tesamorelin binds to GHRH receptors in the pituitary gland, stimulating pulsatile growth hormone release. Research examines its dose-response characteristics and downstream IGF-1 effects.
    • Visceral adiposity studies — Clinical and preclinical models have studied Tesamorelin’s effects on visceral fat accumulation, particularly in metabolic dysfunction models.
    • Metabolic regulation — Research has explored Tesamorelin’s effects on lipid metabolism, insulin sensitivity, and body composition parameters.
    • Cognitive research — Emerging studies have investigated GH/IGF-1 axis activation via Tesamorelin in the context of cognitive function and brain metabolism in aging models.

    Molecular Profile

    • Molecular Formula: C₂₂₁H₃₆₆N₇₂O₆₇S
    • Molecular Weight: 5135.77 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protected from light

    Tesamorelin Research Stack

    Tesamorelin is frequently studied alongside GLP receptor peptides in metabolic research. The Metabolic Stack at Peppy University combines Tesamorelin 10mg and GLP-3 30mg with Reconstitution Solution.

    Shop Tesamorelin 10mg at Peppy University — 99% purity, HPLC verified, fast shipping.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • Glutathione Research Guide: Antioxidant Pathways, Detoxification & Cellular Health Studies (2026)

    Research Use Only. Glutathione is a research compound intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is Glutathione?

    Glutathione (GSH) is a tripeptide composed of glutamate, cysteine, and glycine. It is the most abundant intracellular antioxidant in the human body and a critical molecule in oxidative stress regulation, detoxification, and immune system research. Laboratory studies have extensively examined its role in cellular protection and metabolic health.

    Glutathione in Preclinical Research

    • Antioxidant defense — Glutathione neutralizes reactive oxygen species (ROS) and free radicals, and is a critical substrate for glutathione peroxidase enzymes studied in oxidative stress models.
    • Detoxification pathways — GSH conjugation is a primary Phase II detoxification mechanism in the liver. Research examines its role in xenobiotic metabolism and hepatoprotection.
    • Immune function — Laboratory studies have explored glutathione’s role in lymphocyte proliferation and T-cell function in immune system research models.
    • Mitochondrial protection — Research has examined mitochondrial glutathione (mGSH) as a key factor in protecting against oxidative damage in cellular energy research.
    • Skin and pigmentation research — Preclinical studies have investigated glutathione’s effects on melanin synthesis pathways, relevant to dermatological research.

    Molecular Profile

    • Molecular Formula: C₁₀H₁₇N₃O₆S
    • Molecular Weight: 307.32 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, dark, dry conditions

    Sourcing Glutathione for Research

    Shop Glutathione 600mg at Peppy University — third-party tested, 99% purity, with full documentation. Available individually or as part of the Wellness Stack combined with NAD+ 500mg.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • NAD+ Research Guide: Cellular Energy, Mitochondrial Function & Longevity Studies (2026)

    Research Use Only. NAD+ is a research compound intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is NAD+?

    Nicotinamide Adenine Dinucleotide (NAD+) is a vital coenzyme present in every living cell. It plays a central role in cellular energy metabolism, mitochondrial function, DNA repair, and gene expression. NAD+ levels naturally decline with age, making it a key subject in longevity and cellular health research.

    NAD+ in Preclinical Research

    • Energy metabolism — NAD+ is essential to cellular respiration, functioning as an electron carrier in glycolysis, the citric acid cycle, and the electron transport chain. Laboratory models study its role in ATP production and metabolic efficiency.
    • Sirtuin activation — NAD+ is a required cofactor for sirtuin enzymes (SIRT1-7), which regulate cellular aging, stress responses, and metabolic homeostasis in research models.
    • DNA repair pathways — PARP enzymes consume NAD+ during DNA damage repair. Research has explored the relationship between NAD+ availability and genomic stability.
    • Mitochondrial biogenesis — Preclinical studies have examined NAD+’s role in promoting mitochondrial health and function through PGC-1α activation.
    • Neurological research — Animal models have explored NAD+ supplementation in the context of neurodegenerative pathway studies and brain energy metabolism.

    Molecular Profile

    • Molecular Formula: C₂₁H₂₇N₇O₁₄P₂
    • Molecular Weight: 663.43 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protected from light and moisture

    NAD+ & Glutathione Research Stack

    NAD+ is frequently studied alongside Glutathione in cellular health and longevity research due to their complementary antioxidant and metabolic roles. The Wellness Stack at Peppy University combines NAD+ 500mg, Glutathione 600mg, and Reconstitution Solution for comprehensive laboratory research.

    Shop NAD+ 500mg at Peppy University — 99% purity, HPLC verified.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • GHK-Cu Research Guide: Collagen Synthesis, Skin Repair & Anti-Aging Studies (2026)

    Research Use Only. GHK-Cu is a research peptide intended strictly for laboratory and scientific use. Not for human consumption or therapeutic application.

    What is GHK-Cu?

    GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper) is a naturally occurring copper peptide found in human plasma, urine, and saliva. It is one of the most extensively studied peptides in dermatological and anti-aging research, with preclinical literature exploring its effects on collagen synthesis, skin repair, wound healing, and cellular regeneration.

    GHK-Cu in Preclinical Research

    • Collagen and elastin synthesis — Laboratory studies demonstrate GHK-Cu’s ability to stimulate collagen I, III, and elastin production in fibroblast cell cultures.
    • Wound healing — Research in animal models shows accelerated wound closure and improved tissue remodeling with GHK-Cu application.
    • Anti-inflammatory effects — GHK-Cu has been studied for its potential to downregulate pro-inflammatory cytokines including TNF-alpha and IL-6.
    • DNA repair — Emerging research has explored GHK-Cu’s role in activating DNA repair genes and antioxidant pathways at the cellular level.
    • Hair follicle stimulation — Preclinical models have examined GHK-Cu’s potential to enlarge hair follicle size and stimulate follicular activity.

    Molecular Profile

    • Molecular Formula: C₁₄H₂₃CuN₆O₄
    • Molecular Weight: 403.90 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protected from light

    GHK-Cu Research Applications

    GHK-Cu is available in two research formats at Peppy University:

    Both are included in the Anti-Aging Stack alongside Reconstitution Solution for comprehensive skin regeneration research.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.

  • TB-500 (Thymosin Beta-4) Research Overview: Muscle Repair & Regeneration Studies (2026)

    Research Use Only. TB-500 is a research peptide intended strictly for laboratory and scientific use. It is not approved for human consumption, therapeutic use, or clinical application.

    What is TB-500?

    TB-500 is the synthetic form of Thymosin Beta-4 (Tβ4), a naturally occurring peptide found in virtually all human and animal cells. It plays a critical role in actin regulation, cell migration, and tissue repair. In preclinical research, TB-500 has been studied extensively for its potential effects on muscle repair, wound healing, and cellular regeneration.

    TB-500 in Preclinical Research

    The research literature on TB-500 spans multiple tissue and organ systems:

    • Muscle repair — TB-500 has been shown in animal models to promote satellite cell activation and muscle fiber regeneration following injury.
    • Cardiac tissue — Studies have explored Thymosin Beta-4’s potential role in cardiac repair pathways following ischemic events in rodent models.
    • Hair follicle regeneration — Preclinical data suggests TB-500 may activate hair follicle stem cells, making it a subject of dermatological research.
    • Wound healing — Research indicates TB-500 promotes keratinocyte and endothelial cell migration, accelerating wound closure in laboratory models.
    • Anti-inflammatory pathways — TB-500 has been studied for its potential role in modulating inflammatory cytokine expression in tissue injury models.

    Molecular Profile

    • Molecular Formula: C₂₁₂H₃₅₀N₅₆O₇₈S
    • Molecular Weight: 4963.4 g/mol
    • Form: Lyophilized powder
    • Purity: 99% (HPLC verified)
    • Storage: -20°C, protected from light and moisture

    TB-500 & BPC-157 Combination Research

    TB-500 and BPC-157 are frequently studied together in preclinical recovery models due to their complementary mechanisms — BPC-157 acting primarily on growth factor signaling while TB-500 targets actin dynamics and cell migration. The Wolverine Stack at Peppy University combines both peptides with Reconstitution Solution for laboratory research.

    Sourcing TB-500 for Research

    Peppy University supplies TB-500 10mg with 99% purity and full HPLC documentation for consistent laboratory research outcomes.

    All products at Peppy University are intended strictly for laboratory and scientific research purposes only. Not for human consumption. Research Use Only.