Peptide Research Guides
Reference material on research-peptide quality, preparation, and the most-studied compound classes — written for laboratory researchers. For in-vitro research use only.
What Is the GLOW Peptide Blend? Research Overview
GLOW is a three-peptide research blend of GHK-Cu, BPC-157 and TB-500. Here's what each component is studied for, why the three are combined, and how GLOW differs from KLOW.
What Is MT-2 (Melanotan II)? Research Overview
MT-2 (Melanotan II) is a cyclic, lactam-bridged α-MSH analog studied across several melanocortin receptors. Here's what it is and how it works in research models.
What Is the KLOW Peptide Blend? Research Overview
KLOW is a four-peptide research blend of BPC-157, TB-500, GHK-Cu and KPV. Here's what each component is studied for and why the four are combined.
What Is MT-1 (Melanotan I)? Research Overview
MT-1 (afamelanotide) is a linear α-MSH analog studied at the MC1 receptor in melanogenesis research. Here's what it is and how it differs from MT-2.
What Is NAD+? Coenzyme Research Overview
NAD+ is a coenzyme, not a peptide: the redox carrier and enzyme substrate at the center of cellular-energy research. Here's what the literature describes, from NADH to sirtuins to the salvage pathway.
IGF-1 LR3 vs Tesamorelin: Research Comparison
Tesamorelin acts at the pituitary, upstream of growth hormone; IGF-1 LR3 acts at the IGF-1 receptor, downstream of it. Here's how the two compare and why research models pair them.
Ipamorelin vs Tesamorelin: Research Comparison
One acts at the ghrelin receptor, the other at the GHRH receptor. Here's how ipamorelin and tesamorelin compare, and why the two mechanisms are paired in GH-axis research.
What Is Sermorelin? GRF(1-29) Research Overview
Sermorelin is GRF(1-29)NH2, the shortest fully active fragment of growth-hormone-releasing hormone. Here's what the molecule is, what the acetate means, and how it compares with GHRH, tesamorelin and CJC-1295.
BPC-157 vs KPV: Research Comparison
BPC-157 is studied in angiogenesis and structural-repair models; KPV in inflammatory signaling. A head-to-head research comparison, why the two are paired in KLOW, and where GHK-Cu fits.
SS-31 vs MOTS-c: Mitochondrial Peptide Research Comparison
SS-31 works on the inner mitochondrial membrane; MOTS-c is a signal the mitochondrial genome sends to the rest of the cell. A head-to-head research comparison, and why the two are often studied together.
5-Amino-1MQ vs AOD-9604 (and MOTS-c): Research Comparison
One is a small-molecule enzyme inhibitor, one a growth-hormone fragment, one a peptide encoded in mitochondrial DNA. Here's how 5-amino-1MQ, AOD-9604 and MOTS-c compare as entry points into metabolic research models, and why 5-amino-1MQ and MOTS-c are studied together.
CagriSema vs Tirzepatide (and Retatrutide): Research Comparison
CagriSema is two molecules across two receptor systems; tirzepatide and retatrutide are single molecules spanning two and three receptors. Here's how they compare by receptor coverage, and what each design lets a research model ask.
AOD-9604 vs Tesamorelin: Research Comparison
One is a growth-hormone fragment studied downstream at the fat cell, the other a releasing-hormone analog acting upstream at the pituitary. Here's how AOD-9604 and tesamorelin compare, and why researchers pair them.
What Is 5-Amino-1MQ? NNMT Inhibitor Research Overview
5-Amino-1MQ is a small-molecule NNMT inhibitor, not a peptide. Here's what it is, how NNMT ties into NAD+ and methyl-donor balance, and what research examines.
Where to Buy Research Peptides in 2026 (US Supplier Guide)
Several long-running US peptide vendors closed in 2026. Here's how to choose a USA-made research-peptide supplier now — domestic shipping, fast dispatch, and research-use-only labeling — and what to look for.
What Are Research Peptides? A Beginner's Guide
The pillar overview: what research peptides are, how they're supplied and stored, and where the major research clusters fit — with links to every key guide.
Best Peptides for Skin & Cosmetic Research (2026)
A 2026 roundup of the most-studied skin and cosmetic research peptides — GHK-Cu, Melanotan-1, and the glow and klow blends — and the models they appear in.
Best Research Peptides for Metabolic Studies (2026)
A 2026 roundup of the most-studied metabolic research peptides, organized by mechanism — from single GLP-1 agonists to mitochondrial-derived peptides.
Best Research Peptides for Recovery Studies (2026)
The recovery cluster at a glance: BPC-157, TB-500, the combined blend, and KPV — what each is studied for, and how to choose a research model.
What Is Follistatin? Myostatin-Pathway Research
Follistatin is studied as a natural antagonist of myostatin — the TGF-β ligand that limits muscle growth. Here's how the myostatin pathway works and where follistatin fits in research.
GHK-Cu Copper Peptide: Research Guide
GHK-Cu is a copper-binding tripeptide studied in collagen-synthesis and extracellular-matrix remodeling models. A complete research guide.
What Is IGF-1 LR3? Research Overview
IGF-1 LR3 is the long-acting analog of insulin-like growth factor 1, engineered to evade binding proteins and study IGF-1 receptor signaling downstream of growth hormone.
What Is Tesamorelin? GHRH Analog Research Overview
Tesamorelin is a GHRH analog studied in the growth-hormone axis. Here's what it is and how it differs from the incretin agonists in metabolic research.
What Is DSIP (Delta Sleep-Inducing Peptide)? Research
DSIP (Delta Sleep-Inducing Peptide) is a nonapeptide studied in sleep-regulation and neuroendocrine research models. Here's what the literature describes.
What Is AOD-9604? Research Overview
AOD-9604 is a fragment of the human growth hormone molecule (residues 176-191) studied in lipid-metabolism research. Here's what it is.
Sermorelin vs CJC-1295: GHRH Analog Comparison
Both are GHRH analogs that target the same receptor — but sermorelin is the parent fragment while CJC-1295 adds stabilizing modifications. Here's how the two compare in research terms.
What Is SS-31 (Elamipretide)? Mitochondrial Peptide Research
SS-31 (elamipretide) is a mitochondria-targeted tetrapeptide studied for cardiolipin binding and mitochondrial function. Here's the research overview.
What Is MOTS-c? Mitochondrial-Derived Peptide Research
MOTS-c is a mitochondrial-derived peptide encoded in mitochondrial DNA. Here's what it is and why it sits apart from the incretin agonists.
Are Research Peptides Legal in the USA? (RUO Explained)
How research-use-only (RUO) status works in the US — why research peptides are sold strictly as in-vitro laboratory reference standards, not approved for human use.
What Is Selank? Anxiolytic-Class Peptide Research
Selank is a tuftsin-derived peptide studied in anxiolytic-class and GABAergic research models. Here's what the literature describes and how it's handled in the lab.
Cagrilintide + Semaglutide: The Amylin/GLP-1 Research Combo
Cagrilintide is an amylin analog studied alongside semaglutide. Here's why the amylin/GLP-1 combination is its own research category.
What Is Ipamorelin? Selective GH Secretagogue Research
Ipamorelin is studied as one of the most selective GH secretagogues known — a ghrelin-receptor agonist that triggers GH release with a notably clean off-target profile in research models.
What Is KPV? Anti-Inflammatory Tripeptide Research
KPV is a three-amino-acid fragment of alpha-MSH studied in anti-inflammatory and NF-kB signaling models. Here's what it is and what it's studied for.
Semax vs Selank: Research Comparison
Semax and Selank are often paired, but they trace to different parent peptides and are studied along different research lines. A structured head-to-head comparison.
Tirzepatide vs Retatrutide: Research Comparison
Dual agonist vs triple agonist — how tirzepatide and retatrutide differ at the receptor level, and why the glucagon arm changes the research question.
How Long Do Reconstituted Peptides Last in the Fridge?
Refrigerated shelf-life of reconstituted research peptides — how the bacteriostatic-water preservative extends the window, and what shortens it.
CJC-1295 DAC vs No-DAC: Research Comparison
The only meaningful difference between the two CJC-1295 forms is the DAC — and it changes everything about the kinetics. Here's what the Drug Affinity Complex does in research terms.
What Is Semaglutide? GLP-1 Research Peptide Overview
Semaglutide is the foundational single GLP-1 agonist in the metabolic cluster. Here's what it is, the GLP-1 receptor it targets, and how research uses it.
How to Store Research Peptides: Lyophilized & Reconstituted
Storage temperatures and handling for both lyophilized powder and reconstituted solution — the freezer/fridge rules, light protection, and why freeze-thaw cycles matter.
What Is Semax? Nootropic Peptide Research Overview
Semax is a short ACTH(4-10)-derived peptide studied in BDNF-expression and neuroprotection research models. Here's what the research describes — and how it's handled as a reference standard.
CJC-1295 + Ipamorelin: The GH-Axis Research Stack
The most-studied growth-hormone secretagogue pairing in research models: how a GHRH analog and a selective GH secretagogue act on different receptors to amplify pulsatile GH release.
What Is TB-500 (Thymosin Beta-4)? Research Overview
TB-500 is a synthetic Thymosin Beta-4 fragment studied for actin binding and cell migration. Here's what it is and how it differs from BPC-157.
What Is Tirzepatide? Dual GIP/GLP-1 Research Peptide
Tirzepatide is the dual-agonist incretin peptide — GIP plus GLP-1. Here's what it is, the receptors it targets, and how research uses it.
Bacteriostatic vs Sterile Water for Peptide Reconstitution
The core difference between bacteriostatic and sterile water — the 0.9% benzyl alcohol preservative — and which diluent fits multi-use vs single-use peptide reconstitution.
What Is BPC-157? Research Peptide Overview
BPC-157 is the most-studied compound in tissue-repair peptide research. Here's what it is, where its sequence comes from, and what it's studied for.
What Is Retatrutide (LY3437943)? Research Overview
Retatrutide (LY3437943) is the first triple agonist in the metabolic cluster — GIP, GLP-1, and glucagon. Here's what it is and what research examines.
Semaglutide vs Tirzepatide: Research Comparison
Single agonist vs dual agonist — how semaglutide and tirzepatide differ at the receptor level, for metabolic research.
GLP-1 Research Peptides Explained
The metabolic-research cluster everyone's searching for: how semaglutide, tirzepatide, and retatrutide differ at the receptor level.
BPC-157 vs TB-500: Mechanisms and Research Differences
A side-by-side comparison of the two most-studied recovery peptides — origin, mechanism, and research focus.
BPC-157 and TB-500: The Recovery Research Stack Explained
Why BPC-157 and TB-500 are the most-studied recovery pairing in peptide research — mechanisms, the rationale for combining them, and the research kit.
How to Reconstitute Peptides: Step-by-Step (with Calculator)
A clear, step-by-step method for reconstituting lyophilized peptides, the math behind concentration, and a calculator that does it for you.
How to Buy Research Peptides in the USA (2026 Guide)
What separates a legitimate US research-peptide supplier from the rest — domestic fulfillment, fast dispatch, lot numbering, research-use-only labeling, and the buying criteria that actually matter.