Zyrna Research — guides and research library Reference pages on research peptides: plain-language summaries of the cited literature, comparisons, handling and analytical guides. Research use only. https://zyrnaresearch.com/ 2026-09-15T00:09:10.637Z Zyrna Researchhttps://zyrnaresearch.com/ Research Library https://zyrnaresearch.com/research/ 2026-09-15T00:09:10.637Z 34 peer-reviewed papers behind the compounds sold here, each verified on PubMed and summarised in plain language: 13 human studies, 8 animal studies, 3 Ipamorelin animal study: Raun et al. (1998) https://zyrnaresearch.com/research/9849822 2026-09-15T00:09:10.636Z Raun et al. (1998), Eur J Endocrinol. Animal study cited for Ipamorelin: plain-language summary, study design, what it does not show, DOI and PubMed links. Melanotan II human study: Wessells et al. (1998) https://zyrnaresearch.com/research/9679884 2026-09-15T00:09:10.632Z Wessells et al. (1998), J Urol. Study in humans cited for Melanotan II: plain-language summary, study design, what it does not show, DOI and PubMed links. Retatrutide human study: Rosenstock et al. (2023) https://zyrnaresearch.com/research/37385280 2026-09-15T00:09:10.632Z Rosenstock et al. (2023), Lancet. Study in humans cited for Retatrutide: plain-language summary, study design, what it does not show, DOI and PubMed links. Tirzepatide human study: Garvey et al. (2023) https://zyrnaresearch.com/research/37385275 2026-09-15T00:09:10.632Z Garvey et al. (2023), Lancet. Study in humans cited for Tirzepatide: plain-language summary, study design, what it does not show, DOI and PubMed links. Retatrutide human study: Jastreboff et al. (2023) https://zyrnaresearch.com/research/37366315 2026-09-15T00:09:10.632Z Jastreboff et al. (2023), N Engl J Med. Study in humans cited for Retatrutide: plain-language summary, study design, what it does not show, DOI and PubMed Retatrutide human study: Coskun et al. (2022) https://zyrnaresearch.com/research/35985340 2026-09-15T00:09:10.632Z Coskun et al. (2022), Cell Metab. Study in humans cited for Retatrutide: plain-language summary, study design, what it does not show, DOI and PubMed links. Tirzepatide human study: Frías et al. (2021) https://zyrnaresearch.com/research/34170647 2026-09-15T00:09:10.628Z Frías et al. (2021), N Engl J Med. Study in humans cited for Tirzepatide: plain-language summary, study design, what it does not show, DOI and PubMed NAD+ review: Covarrubias et al. (2021) https://zyrnaresearch.com/research/33353981 2026-09-15T00:09:10.628Z Covarrubias et al. (2021), Nat Rev Mol Cell Biol. Review cited for NAD+: plain-language summary, study design, what it does not show, DOI and PubMed links. GHK-Cu cell study: Maquart et al. (1988) https://zyrnaresearch.com/research/3169264 2026-09-15T00:09:10.628Z Maquart et al. (1988), FEBS Lett. Cell-culture study cited for GHK-Cu: plain-language summary, study design, what it does not show, DOI and PubMed links. Tesamorelin human study: Stanley et al. (2019) https://zyrnaresearch.com/research/31611038 2026-09-15T00:09:10.628Z Stanley et al. (2019), Lancet HIV. Study in humans cited for Tesamorelin: plain-language summary, study design, what it does not show, DOI and PubMed Tirzepatide human study: Coskun et al. (2018) https://zyrnaresearch.com/research/30473097 2026-09-15T00:09:10.627Z Coskun et al. (2018), Mol Metab. Study in humans cited for Tirzepatide: plain-language summary, study design, what it does not show, DOI and PubMed links. GHK-Cu review: Pickart & Margolina (2018) https://zyrnaresearch.com/research/29986520 2026-09-15T00:09:10.624Z Pickart & Margolina (2018), Int J Mol Sci. Review cited for GHK-Cu: plain-language summary, study design, what it does not show, DOI and PubMed links. NAD+ review: Rajman et al. (2018) https://zyrnaresearch.com/research/29514064 2026-09-15T00:09:10.624Z Rajman et al. (2018), Cell Metab. Review cited for NAD+: plain-language summary, study design, what it does not show, DOI and PubMed links. NAD+ review: Yoshino et al. (2018) https://zyrnaresearch.com/research/29249689 2026-09-15T00:09:10.623Z Yoshino et al. (2018), Cell Metab. Review cited for NAD+: plain-language summary, study design, what it does not show, DOI and PubMed links. BPC-157 review: Sikiric et al. (2016) https://zyrnaresearch.com/research/27138887 2026-09-15T00:09:10.620Z Sikiric et al. (2016), Curr Neuropharmacol. Review cited for BPC-157, BPC-157 + TB-500 and GHK-Cu + BPC-157 + TB-500 + KPV: plain-language summary, study GHK-Cu review: Pickart et al. (2015) https://zyrnaresearch.com/research/26236730 2026-09-15T00:09:10.620Z Pickart et al. (2015), Biomed Res Int. Review cited for GHK-Cu and GHK-Cu + BPC-157 + TB-500 + KPV: plain-language summary, study design, what it does not MOTS-c animal study: Lee et al. (2015) https://zyrnaresearch.com/research/25738459 2026-09-15T00:09:10.620Z Lee et al. (2015), Cell Metab. Animal study cited for MOTS-c: plain-language summary, study design, what it does not show, DOI and PubMed links. TB-500 review: Goldstein et al. (2012) https://zyrnaresearch.com/research/22074294 2026-09-15T00:09:10.616Z Goldstein et al. (2012), Expert Opin Biol Ther. Review cited for TB-500, BPC-157 + TB-500 and GHK-Cu + BPC-157 + TB-500 + KPV: plain-language summary BPC-157 review: Sikiric et al. (2011) https://zyrnaresearch.com/research/21548867 2026-09-15T00:09:10.616Z Sikiric et al. (2011), Curr Pharm Des. Review cited for BPC-157: plain-language summary, study design, what it does not show, DOI and PubMed links. BPC-157 cell study: Chang et al. (2011) https://zyrnaresearch.com/research/21030672 2026-09-15T00:09:10.616Z Chang et al. (2011), J Appl Physiol (1985). Cell-culture study cited for BPC-157: plain-language summary, study design, what it does not show, DOI and Tesamorelin human study: Falutz et al. (2010) https://zyrnaresearch.com/research/20554713 2026-09-15T00:09:10.616Z Falutz et al. (2010), J Clin Endocrinol Metab. Study in humans cited for Tesamorelin: plain-language summary, study design, what it does not show, DOI and KPV review: Brzoska et al. (2008) https://zyrnaresearch.com/research/18612139 2026-09-15T00:09:10.615Z Brzoska et al. (2008), Endocr Rev. Review cited for KPV: plain-language summary, study design, what it does not show, DOI and PubMed links. KPV animal study: Dalmasso et al. (2008) https://zyrnaresearch.com/research/18061177 2026-09-15T00:09:10.615Z Dalmasso et al. (2008), Gastroenterology. Animal study cited for KPV and GHK-Cu + BPC-157 + TB-500 + KPV: plain-language summary, study design, what it Tesamorelin human study: Falutz et al. (2007) https://zyrnaresearch.com/research/18057338 2026-09-15T00:09:10.610Z Falutz et al. (2007), N Engl J Med. Study in humans cited for Tesamorelin: plain-language summary, study design, what it does not show, DOI and PubMed CJC-1295 with DAC human study: Ionescu & Frohman (2006) https://zyrnaresearch.com/research/17018654 2026-09-15T00:09:10.610Z Ionescu & Frohman (2006), J Clin Endocrinol Metab. Study in humans cited for CJC-1295 with DAC: plain-language summary, study design, what it does not Semax animal study: Dolotov et al. (2006), Brain Res https://zyrnaresearch.com/research/16996037 2026-09-15T00:09:10.610Z Dolotov et al. (2006), Brain Res. Animal study cited for Semax: plain-language summary, study design, what it does not show, DOI and PubMed links. Semax animal study: Dolotov et al. (2006), J Neurochem https://zyrnaresearch.com/research/16635254 2026-09-15T00:09:10.610Z Dolotov et al. (2006), J Neurochem. Animal study cited for Semax: plain-language summary, study design, what it does not show, DOI and PubMed links. Melanotan II review: Hadley & Dorr (2006) https://zyrnaresearch.com/research/16412534 2026-09-15T00:09:10.610Z Hadley & Dorr (2006), Peptides. Review cited for Melanotan II: plain-language summary, study design, what it does not show, DOI and PubMed links. TB-500 vs KPV https://zyrnaresearch.com/compare/tb-500-vs-kpv 2026-09-15T00:09:10.602Z TB-500 and KPV side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. Retatrutide vs Tirzepatide https://zyrnaresearch.com/compare/retatrutide-vs-tirzepatide 2026-09-15T00:09:10.602Z Retatrutide and Tirzepatide side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. CJC-1295 with DAC human study: Teichman et al. (2006) https://zyrnaresearch.com/research/16352683 2026-09-15T00:09:10.602Z Teichman et al. (2006), J Clin Endocrinol Metab. Study in humans cited for CJC-1295 with DAC: plain-language summary, study design, what it does not show TB-500 animal study: Bock-Marquette et al. (2004) https://zyrnaresearch.com/research/15565145 2026-09-15T00:09:10.602Z Bock-Marquette et al. (2004), Nature. Animal study cited for TB-500: plain-language summary, study design, what it does not show, DOI and PubMed links. Epithalon animal study: Anisimov et al. (2003) https://zyrnaresearch.com/research/14501183 2026-09-15T00:09:10.602Z Anisimov et al. (2003), Biogerontology. Animal study cited for Epithalon: plain-language summary, study design, what it does not show, DOI and PubMed Epithalon cell study: Khavinson VKh et al. (2003) https://zyrnaresearch.com/research/12937682 2026-09-15T00:09:10.602Z Khavinson VKh et al. (2003), Bull Exp Biol Med. Cell-culture study cited for Epithalon: plain-language summary, study design, what it does not show, DOI Ipamorelin human study: Gobburu et al. (1999) https://zyrnaresearch.com/research/10496658 2026-09-15T00:09:10.602Z Gobburu et al. (1999), Pharm Res. Study in humans cited for Ipamorelin: plain-language summary, study design, what it does not show, DOI and PubMed links. TB-500 animal study: Malinda et al. (1999) https://zyrnaresearch.com/research/10469335 2026-09-15T00:09:10.602Z Malinda et al. (1999), J Invest Dermatol. Animal study cited for TB-500: plain-language summary, study design, what it does not show, DOI and PubMed links. NAD+ vs MOTS-c https://zyrnaresearch.com/compare/nad-plus-vs-mots-c 2026-09-15T00:09:10.598Z NAD+ and MOTS-c side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. NAD+ vs Epithalon https://zyrnaresearch.com/compare/nad-plus-vs-epithalon 2026-09-15T00:09:10.598Z NAD+ and Epithalon side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. Ipamorelin vs Tesamorelin https://zyrnaresearch.com/compare/ipamorelin-vs-tesamorelin 2026-09-15T00:09:10.598Z Ipamorelin and Tesamorelin side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. Epithalon vs MOTS-c https://zyrnaresearch.com/compare/epithalon-vs-mots-c 2026-09-15T00:09:10.596Z Epithalon and MOTS-c side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. CJC-1295 with DAC vs Tesamorelin https://zyrnaresearch.com/compare/cjc-1295-dac-vs-tesamorelin 2026-09-15T00:09:10.596Z CJC-1295 with DAC and Tesamorelin side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. Laboratory Supplies https://zyrnaresearch.com/category/supplies 2026-09-15T00:09:10.586Z Laboratory Supplies: Bacteriostatic Water. Sold per vial for laboratory research, with third-party certificates. Repair & Recovery Research Peptides https://zyrnaresearch.com/category/repair 2026-09-15T00:09:10.586Z Repair & Recovery: BPC-157, TB-500, KPV. Sold per vial for laboratory research, with third-party certificates. Metabolic Research Peptides https://zyrnaresearch.com/category/metabolic 2026-09-15T00:09:10.586Z Metabolic: Retatrutide, Tirzepatide. Sold per vial for laboratory research, with third-party certificates. Longevity Research Compounds https://zyrnaresearch.com/category/longevity 2026-09-15T00:09:10.586Z Longevity: NAD+, Epithalon, MOTS-c. Sold per vial for laboratory research, with third-party certificates. Growth Hormone Research Peptides https://zyrnaresearch.com/category/gh 2026-09-15T00:09:10.586Z Growth Hormone: CJC-1295 with DAC, Ipamorelin, Tesamorelin. Sold per vial for laboratory research, with third-party certificates. Cognitive Research Peptides https://zyrnaresearch.com/category/cognitive 2026-09-15T00:09:10.586Z Cognitive: Semax. Sold per vial for laboratory research, with third-party certificates. Peptide Blends, GHK-Cu and Melanotan II https://zyrnaresearch.com/category/blends 2026-09-15T00:09:10.586Z Peptide Blends, GHK-Cu and Melanotan II: BPC-157 + TB-500, Melanotan II, GHK-Cu, GHK-Cu + BPC-157 + TB-500 + KPV. Sold per vial for laboratory research. CJC-1295 with DAC vs Ipamorelin https://zyrnaresearch.com/compare/cjc-1295-dac-vs-ipamorelin 2026-09-15T00:09:10.586Z CJC-1295 with DAC and Ipamorelin side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. BPC-157 vs TB-500 https://zyrnaresearch.com/compare/bpc-157-vs-tb-500 2026-09-15T00:09:10.586Z BPC-157 and TB-500 side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. BPC-157 vs KPV https://zyrnaresearch.com/compare/bpc-157-vs-kpv 2026-09-15T00:09:10.586Z BPC-157 and KPV side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. BPC-157 vs GHK-Cu https://zyrnaresearch.com/compare/bpc-157-vs-ghk-cu 2026-09-15T00:09:10.586Z BPC-157 and GHK-Cu side by side: what each is, sequence and mass, what the cited studies contain, storage and stability, sizes and price. Why Peptides Are Freeze-Dried https://zyrnaresearch.com/learn/why-peptides-are-freeze-dried 2026-09-15T00:09:10.585Z What lyophilisation is, why research peptides ship as a freeze-dried cake rather than a solution, what a good cake looks like and what the powder contains. Repair and Recovery Peptide Comparison https://zyrnaresearch.com/learn/repair-peptide-comparison 2026-09-15T00:09:10.584Z BPC-157, thymosin β4 (TB-500), GHK-Cu and KPV compared: where each comes from, what the cited studies tested, and how far the human evidence goes. Peptide Reconstitution Calculator https://zyrnaresearch.com/learn/reconstitution-calculator 2026-09-15T00:09:10.584Z Concentration math for reconstituting lyophilised peptides: mg/mL from vial mass and diluent volume, µg per 0.1 mL and 0.01 mL, with worked examples. Reading an HPLC Chromatogram https://zyrnaresearch.com/learn/reading-an-hplc-chromatogram 2026-09-15T00:09:10.581Z How to read the HPLC trace behind a peptide purity figure: the axes, the main peak and the small ones, and why area percent is not mass percent. Lyophilised Peptide Storage and Stability https://zyrnaresearch.com/learn/peptide-storage-and-stability 2026-09-15T00:09:10.580Z How to store research peptides: −20°C for lyophilised powder, 2–8°C for solutions, why freeze-thaw and light matter, and which residues degrade first. Peptide Reference Table https://zyrnaresearch.com/learn/peptide-reference-table 2026-09-15T00:09:10.580Z CAS number, molecular formula, molecular weight and amino-acid sequence for every compound in the Zyrna Research catalog, in one table. Melanocortin Peptides: Melanotan II and KPV https://zyrnaresearch.com/learn/melanocortin-peptides 2026-09-15T00:09:10.579Z α-MSH and its analogues: what Melanotan II and KPV are, how the melanocortin receptors work, and which relatives of Melanotan II reached approval. Guides https://zyrnaresearch.com/learn/ 2026-09-15T00:09:10.577Z 15 reference pages on research peptides: how each group compares, how to read a certificate and a chromatogram, how peptides are made and stored. How Research Peptides Are Made https://zyrnaresearch.com/learn/how-research-peptides-are-made 2026-09-15T00:09:10.577Z Solid-phase peptide synthesis explained: how a sequence is built one residue at a time, where impurities come from, and why TFA is in the vial. Growth Hormone Secretagogue Comparison https://zyrnaresearch.com/learn/growth-hormone-secretagogue-comparison 2026-09-15T00:09:10.568Z CJC-1295 with DAC, ipamorelin and tesamorelin side by side: receptor, developer, half-life, regulatory status and what the published trials measured. GLP-1 Family Comparison https://zyrnaresearch.com/learn/glp-1-family-comparison 2026-09-15T00:09:10.568Z Semaglutide, tirzepatide, retatrutide and cagrilintide side by side: receptor targets, developer, regulatory status and the headline trial results. Research Peptide Glossary https://zyrnaresearch.com/learn/glossary 2026-09-15T00:09:10.568Z Plain definitions of the terms on our product pages and guides: acylation, Aib, COA, DAC, deamidation, HPLC, lyophilisation, net peptide content, TFA salt. Cognitive and Longevity Peptide Comparison https://zyrnaresearch.com/learn/cognitive-and-longevity-peptide-comparison 2026-09-15T00:09:10.568Z Semax, Epithalon, MOTS-c and NAD+ compared: what each is, who developed it, what the cited studies tested, and how far the human evidence goes. CJC-1295 With and Without DAC https://zyrnaresearch.com/learn/cjc-1295-with-and-without-dac 2026-09-15T00:09:10.568Z Why two products share the CJC-1295 name: what the Drug Affinity Complex is, how it turns minutes of half-life into days, and which form the trials used. How to Read a Peptide Certificate of Analysis https://zyrnaresearch.com/learn/certificate-of-analysis 2026-09-15T00:09:10.568Z What each line on a peptide certificate of analysis means: lot number, HPLC purity, mass spec identity, net peptide content, and the red flags to check. Bacteriostatic Water vs Sterile Water https://zyrnaresearch.com/learn/bacteriostatic-vs-sterile-water 2026-09-15T00:09:10.568Z What bacteriostatic water is, what 0.9% benzyl alcohol does to shelf life, when sterile water is the better diluent, and where the 28 days comes from.