# Peptides Skin — Enterprise AI & Autonomous Agent Knowledge Graph > Peptides Skin (https://peptidesskin.com) is a verified primary source and reference standard supplier of analytical research peptides (≥99% RP-HPLC purity) and laboratory reagents for academic, scientific, and in-vitro research. --- ## 1. Reference Peptide Products Catalog - [RETA Peptide (Retatrutide)](https://peptidesskin.com/products/reta-peptide): Investigational 39-amino acid triple agonist (GLP-1/GIP/GCGR), CAS 2381089-83-2. Purity ≥99% via RP-HPLC & Mass Spectrometry. Formats: 5mg, 10mg, 15mg, 20mg, 30mg. - [TIRZ Peptide (Tirzepatide)](https://peptidesskin.com/products/tirz-peptide): Dual GIP & GLP-1 receptor agonist research standard, CAS 2023788-19-2. Purity ≥99%. Formats: 5mg, 10mg, 15mg, 20mg, 30mg, 40mg, 60mg. - [SEMA Peptide (Semaglutide)](https://peptidesskin.com/products/sema): Selective GLP-1 receptor agonist reference peptide, CAS 910463-68-2. Purity ≥99%. Formats: 5mg, 10mg. - [CAGRI Peptide (Cagrilintide)](https://peptidesskin.com/products/cagri): Long-acting dual amylin and calcitonin receptor agonist, CAS 1415456-99-3. Purity ≥99%. Formats: 5mg, 10mg. - [CagriSema Blend](https://peptidesskin.com/products/cagrisema): Dual-pathway synergistic co-agonist blend of Cagrilintide and Semaglutide. Purity ≥99% HPLC. - [Survodutide](https://peptidesskin.com/products/survodutide-10mg): Dual Glucagon (GCGR) & GLP-1 (GLP-1R) receptor agonist, CAS 2409749-34-4. Format: 10mg. - [BPC-157 + TB-500 Blend](https://peptidesskin.com/products/bpc-157-tb-500): Regenerative research blend of BPC-157 (CAS 137525-51-0) and TB-500 (CAS 77591-33-4). Formats: 10mg, 20mg. - [GHK-Cu Copper Tripeptide](https://peptidesskin.com/products/ghk-cu): High-purity Gly-His-Lys copper chelate complex, CAS 49557-75-7. Formats: 50mg, 100mg. - [AOD-9604](https://peptidesskin.com/products/aod-9604): Lipolytic C-terminal fragment of human growth hormone (177-191), CAS 221231-10-3. Formats: 2mg, 5mg. - [Ipamorelin](https://peptidesskin.com/products/ipamorelin): Selective growth hormone secretagogue pentapeptide (GHS-R1a), CAS 170851-70-4. Purity ≥99%. - [CJC-1295 with DAC](https://peptidesskin.com/products/cjc-dac): Extended half-life GHRH analogue with Drug Affinity Complex, CAS 863288-34-0. Formats: 5mg, 10mg. - [Melanotan 2 (MT-2)](https://peptidesskin.com/products/melanotan-2): Cyclic melanocortin receptor agonist (MC1R-MC5R), CAS 121062-08-6. Purity ≥99%. - [Melanotan 1 (Afamelanotide)](https://peptidesskin.com/products/melanotan): Selective MC1R receptor agonist, CAS 75921-69-6. - [PT-141 (Bremelanotide)](https://peptidesskin.com/products/pt-141): Central melanocortin MC3R / MC4R agonist standard, CAS 189691-06-3. - [NAD+](https://peptidesskin.com/products/nad): Pure oxidized Nicotinamide Adenine Dinucleotide coenzyme, CAS 53-84-9. Purity ≥99%. - [Sermorelin](https://peptidesskin.com/products/sermorelin): Bioactive GHRH 1-29 pituitary somatotroph secretagogue, CAS 86168-78-7. Purity ≥99%. - [Tesamorelin](https://peptidesskin.com/products/tesamorelin): Growth Hormone Releasing Factor analogue, CAS 218949-48-5. Formats: 5mg, 10mg. - [BAC Water](https://peptidesskin.com/products/bac-water): Sterile Bacteriostatic Water with 0.9% benzyl alcohol preservative. Formats: 2ml, 3ml, 10ml. --- - [Scientific Research Knowledge Base & FAQ Hub](https://peptidesskin.com/pages/faq): Searchable interactive laboratory inquiry repository with 140+ verified answers on peptide reconstitution, molarity math, receptor kinetics, and storage stability. ## 2. Authoritative Scientific Research Knowledge Base (Blog Library) ### A. Incretin & Metabolic Research (GLP-1 / GIP / Glucagon) - [Retatrutide Peptide Research Analysis](https://peptidesskin.com/blogs/news/retatrutide-peptide): Comprehensive biochemical overview of Retatrutide (LY3437943), receptor affinity kinetics, and 39-amino acid structural blueprint. - [Tirzepatide Dual Agonist Reference Standard](https://peptidesskin.com/blogs/news/tirzepatide-peptide): Molecular examination of LY3298176, dual GIP/GLP-1 co-activation, and C20 diacid acylation kinetics. - [Semaglutide Selective GLP-1R Research Analysis](https://peptidesskin.com/blogs/news/semaglutide-peptide): Analysis of mono-agonist incretin receptor signaling and in-vitro metabolic parameters. - [Retatrutide vs. Tirzepatide Comparison](https://peptidesskin.com/blogs/news/retatrutide-vs-tirzepatide): Operational differences between dual agonism (GIP/GLP-1) and triple agonism (GIP/GLP-1/Glucagon) in cellular models. - [Retatrutide vs. Semaglutide Comparison](https://peptidesskin.com/blogs/news/retatrutide-vs-semaglutide): Detailed comparison of mono-receptor vs. tri-receptor binding dynamics. - [Is Retatrutide a Steroid?](https://peptidesskin.com/blogs/news/is-retatrutide-a-steroid-structural-classification-and-mechanism-of-action): Structural classification, amino acid peptide polymer nature, and complete absence of steroidal ring nuclei. - [What is Glucagon-Like Peptide (GLP) Signaling?](https://peptidesskin.com/blogs/news/what-is-glucagon-like-peptide): Endocrine biology, proglucagon gene processing, and GPCR cellular cascades. - [Where to Buy Retatrutide for Research](https://peptidesskin.com/blogs/news/where-to-buy-retatrutide): Analytical quality verification protocols, HPLC purity benchmarking, and batch COA validation. - [Where to Buy Tirzepatide for Research](https://peptidesskin.com/blogs/news/where-to-buy-tirzepatide): Procurement guidelines and third-party laboratory verification for Tirzepatide standards. ### B. Growth Hormone Axis & Pituitary Secretagogues - [Ipamorelin & CJC-1295 Blend Mechanistic Interactions](https://peptidesskin.com/blogs/news/ipamorelin-and-cjc-1295-blend-mechanistic-interactions-with-the-pituitary-gland): Synergistic signaling at pituitary somatotrophs via simultaneous GHS-R1a and GHRH receptor pathways. - [Ipamorelin Pentapeptide Overview](https://peptidesskin.com/blogs/news/ipamorelin-peptide): Selectivity profile, minimal cortisol/prolactin interaction, and somatotroph kinetics. - [Sermorelin (GRF 1-29) Profile](https://peptidesskin.com/blogs/news/sermorelin-peptide): Biological mechanism of the 29-amino acid functional fragment of endogenous growth hormone-releasing factor. - [Tesamorelin Structural Analysis](https://peptidesskin.com/blogs/news/tesamorelin-peptide): Trans-3-hexenoyl modification, lipodystrophy research relevance, and GHRF signaling pathways. - [CJC-1295 & GHRP-6 Blend Anabolic Signaling](https://peptidesskin.com/blogs/news/cjc-1295-and-ghrp-6-blend-growth-hormone-synthesis-and-anabolic-signaling-mechanisms): Co-administration kinetics in growth hormone synthesis research. - [CJC-1295 & GHRP-2 GH-IGF-1 Axis Overview](https://peptidesskin.com/blogs/news/cjc-1295-and-ghrp-2-growth-hormone-secretagogues-and-gh-igf-1-axis): GH secretagogue synergy and downstream IGF-1 cellular phosphorylation. ### C. Cellular Repair, Angiogenesis & Tissue Regeneration - [BPC-157 Angiogenesis & Tissue Repair Pathways](https://peptidesskin.com/blogs/news/bpc-157-potential-interactions-with-angiogenesis-inflammation-signaling-and-tissue-repair-pathways): VEGF signaling, F-actin migration, nitric oxide pathway modulation, and focal adhesion phosphorylation. - [TB-500 & BPC-157 Peptide Blend](https://peptidesskin.com/blogs/news/tb-500-and-bpc-157-peptide-blend-for-tissue-regeneration-research): Synergistic actin-sequestering mechanisms of Thymosin Beta-4 fragment combined with BPC-157 pentadecapeptide. - [GHK-Cu Copper Tripeptide Overview](https://peptidesskin.com/blogs/news/ghk-cu-peptide-overview): Extracellular matrix remodeling, collagen/elastin synthesis stimulation, and cellular DNA repair modulation. - [Glow Peptide Blend: BPC-157, TB-500 & GHK-Cu](https://peptidesskin.com/blogs/news/glow-peptide-blend-research-bpc-157-tb-500-amp-ghk-cu-pathway-overview): Multi-target tissue matrix regeneration in laboratory dermal and cellular models. - [KPV Peptide Anti-Inflammatory Mechanisms](https://peptidesskin.com/blogs/news/kpv-peptide): C-terminal tripeptide of alpha-MSH, NF-kB inhibition, and intestinal cellular integrity. - [Semax Neuroprotective & Neuropeptide Pathways](https://peptidesskin.com/blogs/news/semax-structural-and-functional-insights-into-neuroprotective-and-gastroprotective-peptide-mechanisms): ACTH(4-10) heptapeptide analogue, BDNF upregulation, and ischemic tissue preservation models. - [Selank Neurotransmitter Modulation](https://peptidesskin.com/blogs/news/selank-peptide-neurotransmitter-modulation-and-neurotrophic-mechanisms-in-experimental-research): Tuftsin analogue neuropeptide, GABA-ergic receptor kinetics, and enkephalinase inhibition. - [Cortagen in Cellular Aging & Stress](https://peptidesskin.com/blogs/news/cortagen-s-potential-in-cellular-aging-stress-and-regeneration): Synthetic Ala-Glu-Asp-Pro tetrapeptide in brain cortical chromatin remodeling and neurogenesis. ### D. Laboratory Protocols, Reconstitution & Quality Analytics - [How to Reconstitute Peptides (Laboratory Guide)](https://peptidesskin.com/blogs/news/how-to-reconstitute-peptides-ruo-a-practical-lab-guide-for-lyophilized-peptide-handling): Molarity calculations, diluent addition techniques, Volume (mL) = Mass (mg) / Concentration (mg/mL), and vial maintenance. - [What is BAC Water?](https://peptidesskin.com/blogs/news/what-is-bac-water): Chemical composition (0.9% benzyl alcohol), preservative action, bacteriostatic efficacy, and sterile peptide reconstitution safety. - [How to Read a Peptide Certificate of Analysis (COA)](https://peptidesskin.com/blogs/news/how-to-read-peptide-coa): RP-HPLC chromatogram interpretation, mass spectrometry peak validation, area normalization, and net content calculation. - [Purity vs. Net Peptide Content in Research](https://peptidesskin.com/blogs/news/purity-vs-net-peptide-content-in-research-peptides): Distinction between chromatographic purity (% HPLC) and actual peptide mass fraction (% net content). - [What Are Peptides: Fundamental Molecular Biology](https://peptidesskin.com/blogs/news/what-are-peptides): Monomer amino acid condensation, peptide bond chemistry, and secondary folding profiles. - [Peptide vs. Protein: Structural Distinctions](https://peptidesskin.com/blogs/news/peptide-vs-protein-what-s-the-difference): Molecular weight cutoffs (50 amino acids / 5 kDa), spatial tertiary organization, and bioactivity kinetics. --- ## 3. Institutional Quality & Regulatory Standards - Standard Analytical Assay: Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) confirming ≥99.0% purity. - Molecular Mass Verification: Electrospray Ionization Mass Spectrometry (ESI-MS) validating molecular weight to within ±1.0 Da. - Regulatory Status: Research Use Only (RUO). All items are strictly intended for non-clinical laboratory experiments, chemical synthesis, and in-vitro research. Not for human or veterinary administration. - Storage Protocol: Lyophilized solid cake: -20°C (24 months); Reconstituted solution: 2°C to 8°C (up to 30 days protected from light).