Research Library
How research peptides are tested, documented and described, written for laboratory researchers. Each article lists its sources and the limits of the evidence.
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All guides- Documentation & qualityHow to read a BPC-157 + TB-500 blend COA: two identities, two amounts, and the thymosin beta-4 line, worked through on lot RN-2610-BPCTBReading a BPC-157 + TB-500 blend COA: identity and content for each peptide, the 5 mg + 5 mg label check, and why a report may list thymosin beta-4.November 6, 20269 min read
- Documentation & qualityHow to read a Klow blend COA: four peptides, four identities, four amounts, worked through on lot RN-2610-KLOWHow to read a Klow COA: identity and content for GHK-Cu, BPC-157, TB-500 and KPV, why the total can exceed 80 mg, and what blend purity means.November 6, 20269 min read
- Documentation & qualityResearch peptide news, October 2026: the HHS compounding policy, vendor closures and what changedOctober 2026 research-peptide news, dated and sourced: the Oct 28 HHS compounding policy and Nov 13 comment deadline, FDA status, vendor closures, testing.November 6, 20268 min read
Latest articles
- Documentation & qualityResearch-peptide vendor closures in 2026: a dated list of what each notice said and what customers were toldResearch-peptide vendors that shut down or stopped taking orders in 2026: dates, what each notice said, what customers were told, and what to check next.November 6, 20268 min read
- Peptide fundamentalsAOD-9604: what the molecule is, what the animal studies and the six human trials measured, and what its record does and does not includeAOD-9604 is a 16-residue modified fragment of human growth hormone. What its rodent studies and six human trials measured, GRAS and WADA status, and its COA.November 2, 202611 min read
- Analytical testingEndotoxin and LAL testing for research peptides: what an EU/mg figure on a certificate means, and when it is missingWhat bacterial endotoxin is, how LAL and recombinant factor C assays report it in EU/mg under USP <85> and <86>, why limits vary, and how to read the COA line.November 2, 202613 min read
- Peptide fundamentalsGlutathione: the tripeptide, its reduced and oxidized forms, how it is measured, and what its COA coversGlutathione (γ-Glu-Cys-Gly, GSH) is a tripeptide with a gamma linkage. Its GSH/GSSG forms, stability, HPLC and LC-MS assays, FDA and USP status, COA reading.November 2, 202610 min read
- Documentation & qualityHow to Vet a Research Peptide Supplier in 2027: A Checklist, and What the Closures ChangedA dated, sourced checklist for evaluating research peptide suppliers in 2026: independent testing, lot-level COAs, the closures, and spotting impersonators.November 2, 20266 min read
- Documentation & qualityIndependent peptide testing labs in 2027: how to read a public test listing and match it to your lotWhat independent peptide testing labs measure, how Freedom Diagnostics Testing, Finnrick and Janoshik publish verifiable records, and how to match one to a lot.November 2, 20269 min read
- Peptide fundamentalsKlow peptide blend: the four peptides in the vial, what each one's research covers, and what a Klow COA has to showKlow is GHK-Cu, BPC-157, TB-500 and KPV in one vial. Measured amounts from an independent lab report, each component's research, and how to read a Klow COA.November 2, 20268 min read
- Peptide fundamentalsMOTS-c: what the molecule is, what the cell, mouse and human studies measured, and where its regulatory status standsMOTS-c is a 16-amino-acid peptide encoded in mitochondrial DNA. What the cell, mouse and human studies measured, its FDA and WADA status, and its COA.November 2, 202610 min read
- Peptide fundamentalsNAD+: what the molecule is, how it is measured, how stable it is, and what a research-grade COA showsNAD+ is a coenzyme, not a peptide. Its formula, molecular weight and CAS, stability in solution, HPLC and LC-MS testing, FDA status, and what a NAD+ COA shows.November 2, 202610 min read
- Peptide fundamentalsPT-141 (bremelanotide): what the molecule is, what the trials measured, and what its FDA label and COA sayPT-141 is bremelanotide, a cyclic melanocortin receptor agonist and ingredient of Vyleesi. Receptor pharmacology, RECONNECT trials, label limits, COA checks.November 2, 202610 min read
- Documentation & qualityResearch peptides in 2027: what changed in 2025–2026 and what to check before you orderDated 2025–2026 events in the research-peptide market: FDA category changes, the July 2026 vote, warning letters, closures, and what to check in 2027.November 2, 202611 min read
- Peptide fundamentalsSermorelin acetate: what the molecule is, what the Geref approval covered, what the trials measured, and what a COA has to showSermorelin acetate is GHRH(1-29) amide, the former ingredient of Geref: its 1990 and 1997 FDA approvals, 2008 discontinuation, trials, WADA status and COA.November 2, 202610 min read
- Peptide fundamentalsTesamorelin: what the molecule is, what the clinical trials measured, and what its FDA label and COA sayTesamorelin is a 44-amino-acid GHRH analogue and the ingredient of Egrifta. Its randomized trials, FDA label limits, WADA status, and how to read a tesamorelin COA.November 2, 20269 min read
- Peptide fundamentalsTFA in research peptides: where trifluoroacetate comes from, what a salt form is, and how to find it on a certificate of analysisWhy synthetic peptides arrive as trifluoroacetate (TFA) salts, how the counter-ion lowers net peptide content but not HPLC purity, and what a COA should say.November 2, 202613 min read
- Peptide fundamentalsIpamorelin: what the molecule is, what the animal and human studies measured, and why development stoppedIpamorelin is a synthetic ghrelin-receptor pentapeptide from Novo Nordisk. Its identifiers, the rat, pig and human studies, what they measured, and its status.October 31, 20269 min read
- Peptide fundamentalsSelank (Thr-Lys-Pro-Arg-Pro-Gly-Pro): what it is, where it comes from, and what the published studies actually testedSelank is a seven-residue synthetic tuftsin analogue from Russia: its sequence, the rat, mouse and cell studies, limited human data, and FDA and WADA status.October 31, 20269 min read
- Peptide fundamentalsSemax (Met-Glu-His-Phe-Pro-Gly-Pro): what it is, where it comes from, and what the published studies measuredSemax is a synthetic ACTH(4-7)-Pro-Gly-Pro heptapeptide from Russian research. Its identifiers, the rat BDNF and stroke studies, human reports and FDA status.October 31, 20268 min read
- Peptide fundamentalsCJC-1295 and ipamorelin: the two molecules in the blend, the receptors they act on, and what has and has not been studiedA CJC-1295/ipamorelin vial holds a GHRH-receptor analogue and a ghrelin-receptor pentapeptide. What each is, the research behind it, and what a blend COA shows.October 30, 20268 min read
- Peptide fundamentalsCJC-1295 with and without DAC: two different molecules behind one name, and what the published research actually testedCJC-1295 without DAC (mod GRF 1-29) and CJC-1295 with DAC are different molecules. Their structures, identifiers, the studies behind each and status.October 30, 20268 min read
- Peptide fundamentalsGHK-Cu copper peptide: what it is, how it differs from GHK, and what the research actually measuredGHK-Cu is the copper(II) complex of the plasma tripeptide Gly-His-Lys. Identifiers, GHK vs GHK-Cu, the cell, rat and topical studies, and regulator status.October 30, 202610 min read
- Peptide fundamentalsGlow Blend vs Klow: what is in each vial, what each component is, and what has (and has not) been studiedGlow Blend is BPC-157, TB-500 and GHK-Cu; Klow adds KPV. Composition, what each peptide is, the evidence for each, and why neither mixture has been studied.October 30, 20268 min read
- Peptide fundamentalsKPV (Lys-Pro-Val): what it is, where it comes from, and what the published studies actually testedKPV is the three-amino-acid C-terminal fragment of α-MSH. Its identifiers, the cell and mouse studies behind it, what they measured, and what remains untested.October 30, 20267 min read
- Documentation & qualityPeptide Batch Traceability: From Synthesis Lot to Labeled VialHow batch traceability links a peptide synthesis lot to a labeled vial: lot numbers, batch records, matching a COA, and what breaks the chain.October 30, 20268 min read
- RegulatoryPeptide Sciences has shut down: what its notice says, and what to check before you choose another supplierPeptide Sciences ended all research-product sales in March 2026. What its notice says, the impersonation warning, and how to vet any supplier, including us.October 30, 20265 min read
- Documentation & qualityReselling research peptides: what a responsible research-product reseller needs in 2026For research-peptide resellers: the research-use rules that follow the product, what regulators cited in 2026, lot documentation and choosing a supplier.October 30, 20267 min read
- Peptide fundamentalsTB-500 and thymosin beta-4: what each name refers to and what the research coversTB-500 is a seven-residue acetylated fragment of thymosin beta-4, a 43-residue protein. How the two differ, what each was studied for, and regulatory status.October 30, 202610 min read
- Peptide fundamentalsThymosin alpha 1 (thymalfasin): what it is, its regulatory status, and what the trials actually testedThymosin alpha 1 (thymalfasin) is a 28-residue acetylated thymic peptide. Its sequence, identifiers, hepatitis, vaccine and sepsis trials, and FDA status.October 30, 20269 min read
- Documentation & qualityWhite label vs private label research peptides: what resellers should know before relabelingWhite label, private label and supplier-branded research peptides compared for resellers: who owns the label, minimums, and lot traceability.October 30, 20265 min read
- Documentation & qualityWholesale research peptides: how bulk ordering works for laboratories, suppliers and resellersHow research-peptide wholesale works: who qualifies, how tiers and minimums are set, what documentation to get per lot, and how to compare suppliers.October 30, 20267 min read
- Analytical testingCommon Misreadings of Peptide Purity ReportsNine common ways a peptide purity report gets misread, from reading HPLC area % as content by weight to trusting a number with no chromatogram.October 24, 20267 min read
- Documentation & qualityHow to compare research peptide prices: per-milligram cost, net peptide content, and what a low price can hideVial prices are not comparable until you know the milligrams, net peptide content, salt form and testing included. A short method for comparing listings.October 24, 20267 min read
- Documentation & qualityHow to verify a Certificate of Analysis is genuine: report numbers, laboratory contact, lot matching and the signs of a copied reportReading a COA is one skill; checking it is real is another. How to match a report to a lot, confirm it with the laboratory, and spot reused or altered reports.October 24, 20267 min read
- Peptide fundamentalsLyophilization: How Freeze-Drying Preserves PeptidesHow lyophilization of peptides works: freezing, sublimation and desorption, collapse temperature, degradation chemistry, and residual moisture on a COA.October 24, 20269 min read
- Documentation & qualityPeptide blends: what a multi-peptide vial is, how a blend's Certificate of Analysis works, and how to compare listingsA research peptide blend is two or more peptides lyophilized in one vial. What the label total means, why ratios matter, what a blend COA must show.October 24, 20267 min read
- Peptide fundamentalsStoring lyophilized peptides: temperature, moisture, light, and the chemistry of what goes wrongLyophilized peptides are stable but not inert. The main degradation pathways, what speeds each one up, and the storage practice that follows for sealed vials.October 24, 20268 min read
- Peptide fundamentalsGLP-1, GIP and Glucagon Receptor Agonist Peptides: Single, Dual and Triple Agonists Explained for the LaboratoryWhat GLP-1, GIP and glucagon receptor agonist peptides are, how single, dual and triple agonists differ, and what to check on a lipidated peptide COA.October 14, 20264 min read
- Documentation & qualityHow to choose a research-peptide vendor after a closure: a 2025–2026 timeline, a checklist and the red flagsSix research-peptide vendors closed between June 2025 and October 2026: a dated timeline, what follows a closure, ten checks for any supplier and the red flags.October 14, 20268 min read
- Reading researchHow to Read Published Peptide Research: Study Types and Evidence LevelsHow to read research papers on peptides: study types from cell work to meta-analyses, preprints, methods, p-values vs effect sizes, bias and retractions.October 14, 20268 min read
- Documentation & qualityLaboratory Documentation Standards: GLP, ALCOA+ and Why Records MatterALCOA+ data integrity explained principle by principle, how GLP, GMP and ISO 17025 differ, and how to apply them when reading COAs and batch records.October 14, 20268 min read
- RegulatorySoma Chems has stopped taking orders: what its site says, and what to check before you choose any supplierAs of Oct 13, 2026, somachems.com says it is no longer accepting new orders. What the site shows, what to do about an open order, and how to vet any supplier.October 14, 202610 min read
- Peptide fundamentalsThe "Wolverine stack": what the nickname means and what is actually in the vial"Wolverine stack" is forum shorthand for a two-peptide blend, not a chemical name: what it means, why ratio and total mg matter, and what a blend COA shows.October 30, 20264 min read
- Documentation & qualityHow to Read a Certificate of Analysis (COA)What each part of a peptide Certificate of Analysis means — batch number, test methods, specification versus result — and the warning signs of a COA you should not rely on.September 27, 20265 min read
- Analytical testingHPLC and Mass Spectrometry: How Peptide Purity and Identity Are TestedA plain-language explainer of the two core analytical methods behind a peptide COA: what HPLC purity measures, what mass spectrometry confirms, and what neither can tell you on its own.September 27, 20266 min read
- Peptide fundamentalsResearch Peptide GlossaryShort definitions of the terms that appear on peptide product pages and Certificates of Analysis, from lyophilized and counter-ion to HPLC, MS and net peptide content.September 27, 20264 min read
Educational content for laboratory researchers, not medical advice. Renuvia Labs products are for laboratory research use only. See the Research Use Policy.