Peptide Storage and Handling: A Laboratory Checklist
A laboratory checklist for peptide storage, moisture, labeling and handling records, with clear limits on stability and shelf-life assumptions.
Storage / HandlingOpen reference →
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Peptide LC-MS: Reading Mass and Identity Evidence
Understand peptide mass-to-charge, charge states and expected versus observed mass, including what an LC-MS identity result cannot establish.
General ResearchOpen reference →
How to Read a Peptide HPLC Chromatogram
Read peptide HPLC peaks, retention time and integrated area, and understand why area purity does not establish identity or vial content.
General ResearchOpen reference →
SLU-PP-332: ERR Agonist Research Guide 2026
Almost every compound on a research menu is a peptide. SLU-PP-332 is not. It is a 290-dalton small molecule that acts on a nuclear receptor family rather than a cell-surface GPCR, and that single structural fact changes what the literature can show, what the mechanism looks like, and — most practically — what a certificate…
Mitochondrial / CellularOpen reference →
Teduglutide ([Gly2]GLP-2): DPP-4-Resistant Analog Design, GLP-2R/IGF-1 Paracrine Signaling, and the Single-Residue Identity Problem — A 2026 Research Guide
Almost every proglucagon-derived compound in the research market points at the same organ. Semaglutide, tirzepatide, retatrutide, survodutide, mazdutide — different scaffolds, different receptor combinations, all studied through the lens of systemic metabolism. Teduglutide is the outlier. It comes from the same precursor protein and the same class B GPCR family, but has nothing to do…
GLP / MetabolicOpen reference →
Mazdutide (IBI362 / LY3305677): Oxyntomodulin Backbone, GLP-1R/GCGR Co-Agonism, and the Lipidation Analytics Problem — A 2026 Research Guide
Most incretin compounds circulating in the research market are built on one of two scaffolds: the GLP-1 backbone (semaglutide, liraglutide) or the GIP backbone with GLP-1 activity engineered onto it (tirzepatide). Mazdutide is built on neither. It descends from oxyntomodulin — a 37-residue proglucagon cleavage product that mammals already make, and which has the unusual…
GLP / MetabolicOpen reference →
AOD-9604 and hGH Fragment 176-191: Structure, β3-Adrenergic Pathway Mechanism, and the 16-Dalton Identity Problem — A 2026 Research Guide
AOD-9604 occupies an unusual position in the research peptide market. It is not a growth hormone secretagogue, not a GHRH analog, and not a growth hormone mimetic in the classical sense — it is a 16-residue excerpt of the growth hormone molecule itself, engineered in the 1990s at Monash University on the hypothesis that the…
GH AxisOpen reference →
The Next PCAC Peptide Review — Five Compounds Face the Committee Before February 2027
The July 2026 Pharmacy Compounding Advisory Committee meeting dominated peptide coverage for a month — six of seven substances recommended for the Section 503A Bulks List, over the written objection of the FDA's own review staff. Almost none of that coverage mentioned the second half of the same Federal Register notice: the FDA committed to…
General ResearchOpen reference →
Melanotan I (Afamelanotide): Linear α-MSH Design, MC1R Structural Pharmacology, and Analytical Verification — A 2026 Research Guide
Melanotan I is the rare research peptide with a complete paper trail. It began as a 1980 structure–activity experiment at the University of Arizona, became the reference agonist most of melanocortin pharmacology was built on, and in 2019 became the only molecule in its class to hold a marketing authorization anywhere — approved as afamelanotide…
Cytoprotective / ECMOpen reference →
Melanotan II: Cyclic Lactam Design, Melanocortin Receptor Pharmacology, and the Analytical Problem — A 2026 Research Guide
Melanotan II occupies an unusual position in peptide science. It is simultaneously one of the most carefully engineered molecules in the melanocortin field — a deliberate exercise in conformational constraint that came out of computational design work at the University of Arizona in the late 1980s — and one of the most poorly characterized compounds…
Cytoprotective / ECMOpen reference →
GHRP-2 (Pralmorelin): Molecular Profile, GHS-R1a Signaling, and the Preclinical Record — A 2026 Research Guide
GHRP-2 is the compound that made the ghrelin receptor findable. Synthesized in the Bowers laboratory as a second-generation refinement of GHRP-6, it was potent enough to serve as the functional benchmark that let pharmacologists characterize a binding site nobody had yet cloned — a site that turned out to have an endogenous ligand made in…
GH AxisOpen reference →
PEG-MGF: Mechano Growth Factor and the IGF-1Ec E-Domain — A 2026 Research Guide
Most peptides in the growth-hormone axis are studied as signals that arrive from somewhere else — released by the pituitary, carried in circulation, and read by a distant tissue. Mechano growth factor is studied as the opposite case: a locally produced fragment that appears in muscle only after the tissue has been mechanically loaded or…
GH AxisOpen reference →
IGF-1 LR3 (Long R3 IGF-I): Structure, IGF-1R Signaling, and the Serum-Free Culture Record — A 2026 Research Guide
Most of the compounds covered in this Research Hub reached laboratories by way of the research-chemical market. IGF-1 LR3 arrived by a different route. Long R3 IGF-I was engineered in the early 1990s as a protein-engineering exercise — an attempt to separate receptor binding from binding-protein sequestration in insulin-like growth factor 1 — and it…
GH AxisOpen reference →
FOXO4-DRI: Retro-Inverso Design, the FOXO4–p53 Interface, and the Senolytic Preclinical Record — A 2026 Research Guide
Most research peptides are copies of something the body already makes. FOXO4-DRI is not. It is a designed molecule — a fragment of a human transcription factor, rebuilt backwards out of mirror-image amino acids, and fused to a cationic delivery module borrowed from a virus. It was introduced in a 2017 Cell paper as a…
Mitochondrial / CellularOpen reference →
VIP (Vasoactive Intestinal Peptide): Structure, VPAC Receptor Signaling, and the Preclinical Record — A 2026 Research Guide
Vasoactive intestinal peptide occupies an unusual position in peptide science. Isolated in 1970 from porcine duodenum by Said and Mutt and characterized initially as a gut vasodilator, it spent the following five decades being re-discovered by fields with nothing to do with the intestine — neuroscience, circadian biology, and most recently tumor immunology. Its receptor…
Cytoprotective / ECMOpen reference →
Follistatin-344: The Myostatin and Activin Ligand Trap — A 2026 Research Guide
Few molecules illustrate the logic of negative regulation as cleanly as follistatin. Where most growth signaling is studied by asking what a ligand does when it binds its receptor, follistatin is studied by asking what happens when a ligand is prevented from binding at all. It is a secreted glycoprotein that physically captures members of…
GH AxisOpen reference →
Humanin: The First Mitochondrial-Derived Peptide — A 2026 Research Guide
Humanin occupies an unusual place in molecular biology: it was the peptide that forced researchers to reconsider what the mitochondrial genome actually encodes. Identified in 2001 from a small open reading frame inside the mitochondrial 16S ribosomal RNA region, humanin became the founding member of a class now called mitochondrial-derived peptides (MDPs) — short bioactive…
Mitochondrial / CellularOpen reference →
MK-677 (Ibutamoren) Research Guide: GHS-R1a Mechanism, Preclinical GH-Axis Literature, and Verification
Most of the compounds in a growth-hormone-axis research library are peptides — short chains of amino acids that engage the ghrelin receptor and then are rapidly cleared. MK-677 is the exception that proves the rule. It is not a peptide at all. It is a small, orally stable molecule that Merck chemists designed in the…
GH AxisOpen reference →
GHRP-6 Research Guide: GHS-R1a and CD36 Mechanism, Preclinical Literature, and Verification
Almost every synthetic growth hormone secretagogue in a modern research library traces back to a single hexapeptide characterized in the early 1980s. GHRP-6 — growth hormone-releasing peptide-6 — is that founding molecule: the first synthetic peptide shown to release growth hormone through a receptor system entirely distinct from growth hormone-releasing hormone. It is the parent…
GH AxisOpen reference →
Hexarelin Research Guide: GHS-R1a and CD36 Mechanism, Preclinical Literature, and Verification
Most growth-hormone-axis peptides are studied for a single job: engage a receptor on the pituitary and raise growth hormone output. Hexarelin is unusual because it does two distinct things through two distinct receptors. It is one of the most potent peptide growth hormone secretagogues ever characterized, acting at the same receptor as ghrelin — and…
GH AxisOpen reference →
ARA-290 (Cibinetide): Innate Repair Receptor Mechanism, Literature, and Verification
Most research peptides begin their story as fragments of something larger, and ARA-290 is an unusually elegant example. It is an eleven-amino-acid sequence lifted directly from a single surface of the erythropoietin molecule — the hormone best known for driving red blood cell production — but engineered specifically to leave that hematopoietic function behind. What…
Cytoprotective / ECMOpen reference →
DSIP (Delta Sleep-Inducing Peptide): Mechanism, Literature, and Verification
Few research peptides carry a name as evocative — or as misleading — as delta sleep-inducing peptide. DSIP was isolated in the late 1970s from the cerebral venous blood of rabbits during an electrically induced sleep state, and it was christened for the delta-wave EEG activity that accompanied its discovery. Nearly five decades later, the…
CNS / NeuropeptideOpen reference →
Kisspeptin-10 Research Guide: KISS1R Mechanism, Literature, and Verification
Few discoveries reshaped neuroendocrine research as quickly as kisspeptin. A peptide originally flagged as a metastasis suppressor turned out, within a few years, to be the master upstream switch of the reproductive axis — the signal that sits above gonadotropin-releasing hormone (GnRH) and gates the entire hypothalamic-pituitary-gonadal cascade. Kisspeptin-10 is the short, synthetically tractable fragment…
Mitochondrial / CellularOpen reference →
Sermorelin Research Guide: GHRH(1-29) Mechanism, Literature, and Verification
Sermorelin holds a foundational place in growth-hormone-axis pharmacology: it is the shortest fragment of growth hormone-releasing hormone that still behaves as a full agonist of the GHRH receptor. Where the native hormone runs to 44 residues, sermorelin reproduces only the first 29 — and that truncation turns out to be enough to engage the receptor…
GH AxisOpen reference →
Dihexa Research Guide: Angiotensin IV Analog, HGF/c-Met Mechanism, Synaptogenesis Literature, and Verification
Most small peptides borrowed from endogenous signaling systems are weak, short-lived, and easily degraded — which is exactly why the angiotensin IV field spent two decades engineering around those limitations. Dihexa is the endpoint of that effort: a heavily modified, metabolically stabilized analog of angiotensin IV designed to survive in solution, cross the blood-brain barrier,…
CNS / NeuropeptideOpen reference →
SS-31 (Elamipretide) Mitochondrial Peptide Research Guide 2026
Among the mitochondria-targeted compounds studied over the past two decades, few have accumulated a preclinical literature as focused as SS-31, the aromatic-cationic tetrapeptide better known by its generic name elamipretide. Where most antioxidants disperse throughout the cell, SS-31 was designed by Hazel Szeto and Peter Schiller to do something narrower: concentrate at the inner mitochondrial…
Mitochondrial / CellularOpen reference →
Thymosin Alpha-1 Research Guide: Thymalfasin Mechanism, Immune Signaling Literature, and Verification
Most of the peptides that fill a modern research library are engineered analogs — sequences modified, stabilized, or fused to do something their natural parent could not. Thymosin alpha-1 is the opposite kind of reference compound: a naturally occurring 28-residue fragment that the body itself carves out of a larger nuclear protein, and one that…
Cytoprotective / ECMOpen reference →
KPV Peptide Research Guide: Alpha-MSH C-Terminal Tripeptide Mechanism, Literature, and Verification
Most peptides in a research library are built up from a signaling parent — longer, more elaborate, engineered for stability or receptor affinity. KPV runs the other way. It is what is left when you strip alpha-melanocyte-stimulating hormone (alpha-MSH) down to its final three amino acids and ask which part of the molecule still does…
Cytoprotective / ECMOpen reference →
Tesamorelin Research Guide: Stabilized GHRH Analog Mechanism, Literature, and Verification
Among growth-hormone-axis peptides, tesamorelin occupies an unusual position: it is a fully synthetic analog of a native hypothalamic hormone, engineered specifically to survive the enzyme that destroys its parent molecule. That single design choice — stabilizing growth hormone-releasing hormone against rapid degradation — is what makes tesamorelin a reference compound for anyone building a research…
GH AxisOpen reference →
LL-37 Cathelicidin Antimicrobial Peptide: A 2026 Research Guide
Among the host-defense peptides that show up in a research library, LL-37 occupies an unusual position: it is not a synthetic construct or an engineered analog but the only cathelicidin the human body actually makes, studied for decades as a model of how a single small peptide can be antimicrobial, immunomodulatory, and angiogenic all at…
Cytoprotective / ECMOpen reference →
Peptide Purity Testing: Identity, Content and Evidence Limits
Distinguish peptide identity, HPLC purity, measured content, sterility and endotoxin evidence, with a practical testing matrix.
Testing / VerificationOpen reference →
The GH Axis Peptide Research Guide: Somatotropic Signaling, Compound Classes, and Verification
Few endocrine systems are studied as continuously as the growth hormone axis. It is one of the oldest characterized neuroendocrine feedback loops, and it remains a reference framework for anyone building a research library around growth-hormone-releasing peptides. The axis is compact but layered: a hypothalamic trigger, a pituitary amplifier, a peripheral effector, and two feedback…
GH AxisOpen reference →
GLP-1 Receptor Research Compounds: A Structural and Mechanistic Guide for the Laboratory
Few receptors in modern metabolic research are studied as intensively as the glucagon-like peptide-1 receptor (GLP-1R). It sits at the center of an entire class of engineered peptides — from the native hormone itself through single-, dual-, and triple-receptor analogs — and it has become one of the most structurally characterized class B G-protein-coupled receptors…
GLP / MetabolicOpen reference →
Retatrutide vs Tirzepatide: Receptor and Research Evidence
Compare retatrutide and tirzepatide receptor profiles, molecular context and research evidence without confusing separate studies with direct comparison.
GLP / MetabolicOpen reference →
PCAC Final Vote: 6 of 7 Peptides Backed for the 503A List — The Complete July 2026 Tally
The FDA's Pharmacy Compounding Advisory Committee (PCAC) has finished its two-day peptide review, and the final scorecard is now complete. Over July 23–24, 2026, the committee recommended six of the seven peptides it evaluated for inclusion on the Section 503A Bulk Drug Substances List — and rejected one. In doing so it overrode its own…
General ResearchOpen reference →
Best Research Peptides 2026 Guide — Molecular Profiles, Mechanisms & How to Verify a Source
"Best research peptides" is a phrase that means something very specific once you strip away the marketing. It does not mean the peptides with the most impressive anecdotes or the loudest vendor copy. In a laboratory context, the peptides worth knowing are the ones with a defined molecular identity, a mechanism described at the receptor…
Testing / VerificationOpen reference →
Survodutide (BI 456906) Dual Agonist Research Guide 2026 — Molecular Profile, GCGR/GLP-1R Mechanism & Verification
Survodutide, known in the development literature as BI 456906, is a synthetic glucagon-based peptide engineered to act at two receptors at once — the glucagon receptor (GCGR) and the glucagon-like peptide-1 receptor (GLP-1R). It belongs to a class of molecules sometimes called "unimolecular dual agonists": single peptides designed to engage more than one metabolic receptor…
GLP / MetabolicOpen reference →
Cagrilintide Amylin Receptor Research Guide 2026 — Molecular Profile, DACRA Mechanism & Verification
Cagrilintide is a synthetic, long-acting amylin analogue, and it belongs to a class of research molecules that has drawn intense interest precisely because of the receptor system it engages rather than any single downstream endpoint. Amylin is a 37-amino-acid peptide hormone co-secreted with insulin, and its receptors are among the more unusual constructs in G…
GLP / MetabolicOpen reference →
5-Amino-1MQ NNMT Inhibitor Research Guide 2026 — Molecular Profile, NAD+/SAM Mechanism & Verification
5-Amino-1MQ is not a peptide. It is a small-molecule quinolinium — a single aromatic ring system rather than an amino-acid chain — and that distinction matters for anyone sourcing it, because it changes the analytical methods, the salt-form questions, and the literature it belongs to. What makes it a heavily studied research compound is its…
Mitochondrial / CellularOpen reference →
Selank Research Peptide Guide 2026 — Molecular Profile, GABAergic Mechanism & Verification
Selank is a synthetic heptapeptide derived from tuftsin, the immunoglobulin G–derived tetrapeptide Thr-Lys-Pro-Arg. What makes it unusual in the research literature is that it does not appear to work through a single receptor: the published mechanistic work describes at least two distinct molecular actions running in parallel — modulation of GABAergic gene expression and receptor…
CNS / NeuropeptideOpen reference →
Semax Neuropeptide Research Guide 2026 — Molecular Profile, BDNF/TrkB Mechanism & Verification
Semax is a synthetic heptapeptide derived from the ACTH(4–10) fragment of adrenocorticotropic hormone, and it has become one of the most frequently referenced peptide tools in laboratories studying neurotrophin signaling. Because it engages the brain-derived neurotrophic factor (BDNF) / TrkB axis — a signaling system that sits at the center of neuronal survival, synaptic plasticity,…
CNS / NeuropeptideOpen reference →
NAD+ Research Compound Guide 2026 — Molecular Profile, Sirtuin & PARP Mechanism, and Verification
NAD+ — nicotinamide adenine dinucleotide — is one of the most heavily studied small molecules in modern cell biology, and unlike most compounds in the research-peptide market it is not a peptide at all. It is a dinucleotide coenzyme present in every living cell, functioning simultaneously as the central electron carrier of metabolism and as…
Mitochondrial / CellularOpen reference →
PT-141 Melanocortin Research Guide 2026 — Molecular Profile, MC4R Receptor Mechanism & Verification
PT-141 is the research-market name for bremelanotide, a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (α-MSH) that acts as a non-selective agonist across the melanocortin receptor family. Because it engages the central melanocortin receptors MC3R and MC4R — two of the most structurally and pharmacologically scrutinized G-protein-coupled receptors in neuroscience — PT-141 has become a…
General ResearchOpen reference →
TB-500 (Thymosin Beta-4) Research 2026 — Molecular Profile, Actin-Sequestering Mechanism & Verification
TB-500 is the name the research-compound market has attached to thymosin beta-4 (Tβ4), one of the most-studied actin-regulating peptides in cell biology. Thymosin beta-4 is a 43-residue, naturally occurring peptide that functions as the principal G-actin-sequestering molecule in most mammalian cells, and it has been examined across three decades of preclinical work in wound-repair, corneal,…
Cytoprotective / ECMOpen reference →
MOTS-c Mitochondrial Research Guide 2026 — Molecular Profile, AMPK Pathway & Verification
MOTS-c — short for "Mitochondrial Open-reading-frame of the Twelve-S rRNA type-c" — occupies an unusual place in peptide biology. It is one of a small family of mitochondrial-derived peptides (MDPs): short peptides encoded not in the nuclear genome but within the mitochondrial DNA itself, in a region of the 12S ribosomal RNA gene that was…
Mitochondrial / CellularOpen reference →
Epithalon Research Peptide 2026 — Molecular Profile, Telomerase Pathway & Verification
Epithalon — also written epitalon or epithalone, and abbreviated AEDG for its four-residue sequence — is one of the most-studied compounds in telomere-biology and geroprotection research. It is a synthetic tetrapeptide derived from the amino-acid composition of epithalamin, a peptide preparation originally isolated from the pineal gland. For laboratories modeling telomerase regulation, cellular replicative capacity,…
Mitochondrial / CellularOpen reference →
The Peptide Industry’s Compliance Landscape Ahead of the July 2026 PCAC Meeting — An Analysis for Research Suppliers
As the FDA's Pharmacy Compounding Advisory Committee prepares to meet on July 23–24, 2026, the peptide sector is paying unusually close attention to compliance. The meeting itself concerns compounding-pharmacy regulation, but the broader climate — heightened regulatory scrutiny, a steady stream of warning letters, and public commentary from healthcare attorneys anticipating enforcement — has made…
General ResearchOpen reference →
CJC-1295 & Ipamorelin Research Guide 2026 — Molecular Profiles & Verification
CJC-1295 and ipamorelin are two of the most frequently co-referenced compounds in growth-hormone (GH) axis pharmacology research. They are studied together because they engage the somatotroph — the GH-secreting cell of the anterior pituitary — through two distinct and complementary receptor systems: CJC-1295 as a long-acting analog of growth hormone-releasing hormone (GHRH), and ipamorelin as…
GH AxisOpen reference →
The 2026 FDA Peptide Reclassification Explained — Category 1/2, the PCAC Review, and What It Means for Research
Few regulatory topics have generated more confusion in the research-compound community this year than the 2026 "peptide reclassification." Headlines have declared peptides "legal again," vendors have implied that long-restricted compounds are now cleared, and a great deal of the commentary has blurred two entirely separate regulatory worlds: the compounding-pharmacy framework that governs prescription preparations, and…
General ResearchOpen reference →
Semaglutide Research Compound Guide 2026 — Molecular Profile & Verification
Semaglutide is a long-acting glucagon-like peptide-1 receptor (GLP-1R) analog that has become one of the most heavily referenced compounds in metabolic receptor pharmacology. As a structurally optimized GLP-1 analog, it has generated an extensive published mechanistic literature spanning receptor binding, intracellular signaling, and in-vitro cellular models — making it a frequent reference compound for laboratories…
GLP / MetabolicOpen reference →
ILS Laboratories Peptide Testing Guide 2026 — What ISO 17025 Verification Actually Means
Almost every research-peptide listing on the market now carries the phrase "third-party tested." The phrase has become so common that it has stopped meaning very much. A certificate of analysis is only as good as the laboratory that produced it, the methods that laboratory ran, and whether anyone outside the vendor can confirm the document…
Testing / VerificationOpen reference →
GHK-Cu Copper Peptide Research 2026 — Molecular Profile, Mechanism & Verification
GHK-Cu is the copper(II) complex of the naturally occurring tripeptide glycyl-L-histidyl-L-lysine (GHK). First isolated from human plasma in 1973, it is among the longest-studied peptides in matrix biology, with a preclinical literature spanning five decades of fibroblast, gene-expression, and tissue-remodeling research. That depth of published work — combined with the compound's distinctive copper chemistry —…
Cytoprotective / ECMOpen reference →
BPC-157 Research Peptide Guide 2026 — Molecular Profile, Mechanism & Verification
BPC-157 is a synthetic pentadecapeptide derived from a partial sequence of a protective protein identified in human gastric juice. Over three decades of preclinical literature — a PubMed search now returns more than one hundred peer-reviewed publications — have made it one of the most frequently referenced compounds in cytoprotection, angiogenesis, and tissue-repair research models.…
Cytoprotective / ECMOpen reference →
Where to Buy Tirzepatide Research Compound in 2026 — Verification Guide
Tirzepatide (LY3298176) is a dual GLP-1/GIP receptor agonist developed by Eli Lilly that has become one of the most researched metabolic pathway compounds of the past three years. As one of the most-studied incretin-agonist research molecules, tirzepatide has generated substantial published pharmacological and mechanistic data — making it one of the most referenced compounds…
GLP / MetabolicOpen reference →
Where to Buy Retatrutide Research Compound in 2026 — Verification Guide
Verification standards, pricing comparison, and what COA documentation should look like when sourcing retatrutide.
GLP / MetabolicOpen reference →
How to Read a Peptide COA: Match the Lot, Method and Result
Match a peptide COA to its lot, interpret purity, identity and content, and see which conclusions require additional evidence.
Testing / VerificationOpen reference →
Peptide Sciences Is Gone — What Researchers Need in 2026
What the Peptide Sciences shutdown revealed about supplier evaluation and what researchers need from a replacement vendor.
General ResearchOpen reference →
Retatrutide (LY3437943): Triple GLP-1/GIP/Glucagon Receptor Agonist — Research Applications and Mechanism
Mechanism, receptor binding, preclinical data and research applications for the most advanced triple agonist in active clinical investigation.
GLP / MetabolicOpen reference →
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Verification
Research context and batch evidence have different jobs.
Articles explain methods and terminology. The COA Library remains the source for the published certificate tied to a specific batch.