Research Blog
Guides, comparisons, and laboratory resources for peptide researchers.
Looking for an older RT3 or GLP-3 research guide? See the retatrutide discontinued reference for the status of those retired pages.
What Are Peptides? Chemistry, Types and Research Uses Explained
Peptides are short chains of amino acids joined by peptide bonds, sitting between single amino acids and full proteins. This guide covers the chemistry, the naming conventions, the main classes researchers work with, and how UK law treats them.
Are Peptides Legal in the UK? The Actual Legal Position
The honest answer is that it depends entirely on what the peptide is sold for, not what the peptide is. Buying and possessing research peptides for laboratory work is lawful in the UK. Supplying them for human consumption is a criminal offence, and that distinction is the whole of the law here.
BPC-157 Research Guide: What Scientists Need to Know
BPC-157 is one of the most widely studied research peptides in preclinical science. Learn about its molecular structure, stability, research applications, and laboratory handling.
TB-500 vs BPC-157: A Researcher's Comparison
TB-500 and BPC-157 are two of the most widely studied peptides in preclinical research. Explore their molecular differences, research applications, and combined laboratory protocols.
GHK-Cu and Collagen: What the ECM and Fibroblast Research Shows
GHK-Cu is a naturally occurring copper-binding tripeptide studied for collagen synthesis, ECM biology, and gene expression research. Learn about its molecular properties and laboratory handling.
CJC-1295 vs Ipamorelin: Differences and Combined Use
CJC-1295 and Ipamorelin are two widely studied growth hormone secretagogues with complementary mechanisms. Learn about their differences, research applications, and why they're often combined in laboratory protocols.
Peptide Storage Guide: How to Store Research Peptides Correctly
Proper storage is critical for maintaining peptide stability and integrity. Learn the essential storage conditions for lyophilised and reconstituted peptides, and avoid common mistakes that compromise research quality.
BPC-157 and TB-500: Research Overview
BPC-157 and TB-500 are two of the most extensively studied tissue-repair research peptides. A complete overview of their mechanisms and combined use.
GHK Peptide (GHK-Cu): What the Copper Tripeptide Is and How It Works
GHK-Cu is a naturally occurring copper tripeptide studied across collagen synthesis, gene expression, and tissue remodelling research. A complete guide.
Tesamorelin vs CJC-1295: GH Secretagogue Research Comparison
Tesamorelin is a stabilised full-length GHRH analogue. CJC-1295 is a truncated GHRH(1-29) analogue with optional DAC technology. Comparison of mechanism, pulsatility, and research applications.
Melanotan I vs Melanotan II: Receptor Selectivity Comparison
Melanotan I and Melanotan II differ in receptor selectivity. One acts narrowly at MC1R, the other broadly across the melanocortin receptor family. A research comparison of mechanism and applications.
Semax vs Selank: Russian Nootropic Peptide Comparison
Semax and Selank are both Russian-developed heptapeptides studied in cognitive and anxiolytic research, but they derive from different parent hormones and act through different pathways.
PT-141 (Bremelanotide): Melanocortin Receptor Research Guide
PT-141 (Bremelanotide) is a cyclic heptapeptide derived from Melanotan II, modified to remove MC1R activity and concentrate action at the central MC3R and MC4R receptors.
MOTS-C: Mitochondrial-Derived Peptide Research Guide
MOTS-C is a short peptide encoded within mitochondrial DNA. Discovered in 2015, it has become a central tool in research on AMPK signalling, metabolic homeostasis, and mitochondrial-nuclear crosstalk.
IGF-1 LR3 Research Guide: Mechanism, Pharmacology, Laboratory Use
IGF-1 LR3 is a long-acting analogue of insulin-like growth factor 1 with an Arg substitution at position 3 and a 13-amino-acid N-terminal extension. Extended half-life and reduced IGFBP binding make it a widely used tool in cell proliferation and myogenesis research.
DSIP (Delta Sleep-Inducing Peptide): Evidence Review
DSIP is a 9-amino-acid peptide first isolated from rabbit cerebral venous blood in 1977. Despite five decades of research, its receptor and mechanism remain uncharacterised. A research guide with an honest review of the evidence base.
CJC-1295 With DAC vs Without DAC: Research Comparison
CJC-1295 exists in two distinct research forms. The 'no DAC' variant produces a pulsatile GH research model with a half-life of around 30 minutes. The 'DAC' variant binds albumin covalently and extends half-life to multiple days. The receptor mechanism is identical; the pharmacokinetics are not.
KPV: Anti-Inflammatory Tripeptide Research Guide
KPV is a tripeptide (lysine-proline-valine) derived from the C-terminal of alpha-MSH. Studied for anti-inflammatory effects in gastrointestinal research models, with NF-kB pathway modulation as the principal proposed mechanism.
Why GLOW Combines Three Repair Peptides in One Vial
GLOW is a pre-blended three-peptide research vial pairing BPC-157, TB-500, and GHK-Cu in a single lyophilised powder. A research guide to the component mechanisms and the co-administration rationale.
KLOW vs GLOW: What Adding KPV Changes
KLOW is a pre-blended four-peptide research vial extending GLOW by adding KPV, a tripeptide with NF-kB-modulating anti-inflammatory activity. A research guide to the four components and their combined application.
NAD+: Cellular Redox Cofactor Research Guide
NAD+ is the central cellular redox cofactor and a substrate for the sirtuin, PARP, and CD38 enzyme families. A research guide to mechanism, the documented decline with ageing, and laboratory applications.
Glutathione: Tripeptide Antioxidant Research Guide
Glutathione is the most abundant non-protein thiol in mammalian cells and the principal cytosolic antioxidant. A research guide to structure, biosynthesis, the GSH/GSSG redox indicator, and laboratory handling.
Epithalon Peptide: Research Guide (Ala-Glu-Asp-Gly)
Epithalon is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) designed from the pineal preparation Epithalamin. This guide covers the telomerase and lifespan literature, the circadian work it inherits, and the structural weaknesses in the evidence base that any researcher should weigh before designing around it.
AOD-9604 Research Guide: The hGH (177-191) Fragment
AOD-9604 is the Tyr-hGH(177-191) fragment: sixteen residues of the human growth hormone C-terminus with an added N-terminal tyrosine. Sequence, disulfide chemistry, the preclinical lipolysis data, and why the phase 2b programme was wound down.
Sermorelin (GHRH 1-29): 5mg vs 10mg Research Guide
Sermorelin is the synthetic GHRH (1-29) fragment, the shortest portion of growth-hormone-releasing hormone that retains full receptor activity. The 5mg and 10mg vials hold the same molecule — this guide covers what the 10mg format changes and what it does not.
Thymosin Alpha-1 Research Guide: The 28-Residue Thymic Peptide
Thymosin alpha-1 is a 28-residue, N-terminally acetylated peptide first isolated from bovine thymus. A research guide to its chemistry, toll-like receptor mechanism, licensed-medicine history and laboratory use.
BPC-157 + TB-500 10+10mg: What the Higher-Mass Rung Changes
The 10+10mg vial is the same chemistry as the 5+5mg rung at double the mass. This guide covers what that changes procedurally, why the 3.5 to 1 molar ratio survives doubling, and where the evidence for the combination honestly stands.
CJC-1295 + Ipamorelin 10+10mg: Research Guide
The CJC-1295 + Ipamorelin 10+10mg vial pairs a modified GHRH(1-29) analogue with a selective ghrelin-receptor agonist. This guide covers the two-receptor design behind the blend, the molar arithmetic of the 1:1 mass ratio, and the honest limits of the evidence base.
Selank + Semax Blend: Research Guide (10+10mg)
Selank + Semax 10+10mg co-formulates the two flagship peptides of one Russian design programme: a tuftsin analogue and an ACTH(4-10) analogue sharing a Pro-Gly-Pro stabilising tail. Component literatures, the near-equimolar arithmetic, and why the blend itself has never been studied.
HGH Fragment 176-191 Research Guide: The hGH C-Terminal Lipolytic Domain
HGH Fragment 176-191 is the native C-terminal sixteen residues of human growth hormone, sequence YLRIVQCRSVEGSCGF, the region studied as the lipolytic domain of the parent hormone. This guide covers the disulfide chemistry, the lipolysis literature, the AOD-9604 relationship and the honest limits of the human evidence.
PEG-MGF Research Guide: The PEGylated IGF-1Ec E-Domain Peptide
PEG-MGF is the PEGylated form of mechano growth factor, the 24-residue E-domain peptide of the IGF-1Ec splice variant (YQPPSTNKNTKSQRRKGSTFEEHK). This guide covers the splice biology, the myoblast and satellite cell literature, the rationale for PEGylation, and the direct non-replication that any researcher should weigh before designing around it.
MGF (Mechano Growth Factor) Research Guide: The IGF-1Ec E-Domain Peptide
MGF, mechano growth factor, is the 24-residue E-domain peptide expressed from the IGF-1Ec splice variant after exercise-induced splicing in muscle tissue. This guide covers the satellite cell and proliferation literature, the contested state of the evidence, and how MGF compares with PEG-MGF and mature IGF-1.
LL-37 Research Guide: The Human Cathelicidin
LL-37 is the only human member of the cathelicidin family of antimicrobial peptides. This guide covers its chemistry, its discovery as FALL-39, the antimicrobial, wound-healing, angiogenesis and epithelial immunology literature, and the honest limits of the human evidence.
Thymalin Research Guide: The Thymus Glu-Trp Dipeptide
Thymalin is the thymus-derived dipeptide Glu-Trp, also referred to as timogen, identified within the calf-thymus polypeptide complex of the Soviet immunomodulator programme. This guide covers the chemistry, the T-cell and immune-restoration literature in aged animal models, the naming confusion with thymulin, and the honest limits of the evidence.
SNAP-8 Peptide: Research Guide (Acetyl Octapeptide-3)
SNAP-8 is a synthetic acetyl octapeptide designed to extend acetyl hexapeptide-3 (Argireline). This guide covers the SNAP-25 and SNARE complex chemistry, the chromaffin cell literature and why the cosmetic evidence base is thinner than most summaries admit.
Oxytocin Peptide: Research Guide (CYIQNCPLG-NH₂)
Oxytocin is a cyclic nonapeptide with a disulphide bridge between its two cysteine residues, first isolated and synthesised in the 1950s. This guide covers the chemistry, the du Vigneaud synthesis, oxytocin receptor pharmacology, the prairie vole pair bonding literature, and why the human trust findings demand caution.
Thymosin Alpha-1: 5mg vs 10mg Research Guide
The Thymosin Alpha-1 5mg and 10mg vials hold the identical 28-residue peptide. This guide covers what the lower-mass format changes: concentration arithmetic, batch structure, and the deamidation chemistry both sizes share.
DSIP 10mg Peptide: Research Guide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu)
DSIP 10mg is the higher-mass research format of UK Peptide Lab's delta sleep-inducing peptide vial. This guide covers the 1977 discovery, the mixed sleep literature, the stress-hormone and circadian strands, and why the peptide remains an unresolved riddle.
Ipamorelin Peptide: Research Guide (Aib-His-D-2-Nal-D-Phe-Lys-NH₂)
Ipamorelin is a synthetic pentapeptide characterised as the first selective growth hormone secretagogue (Raun et al., Eur J Endocrinol, 1998). This guide covers the selectivity data, GHS-R1a pharmacology and the 10mg research format.