Buying research peptides online is less about finding a vendor and more about finding the right listing for each compound. Vial sizes differ, blends are named inconsistently from one supplier to the next, and the documentation behind a purity claim varies widely. This guide walks through the most requested research peptides by category, explains what each one is studied for, and shows where each can be sourced from a single documented catalog.

Every compound below links to its listing at HEEZ Research, a US research peptide supplier whose catalog is tested by an independent third-party laboratory against a 99%+ purity standard, with Certificates of Analysis published on the product pages. Everything discussed here is sold for laboratory research use only and is not intended for human or veterinary use.

What to Check Before You Buy Any Research Peptide

Four things separate a usable research listing from a risky one. First, the vial contents should be stated exactly, including the milligram amount and, for blends, the amount of each component. Second, purity should be tied to a test method such as HPLC, not just a number on a label. Third, a Certificate of Analysis should be available to read before ordering, and its lot number should match the vial you receive. Fourth, the product should be clearly labeled for research use only. A supplier that makes all four easy to verify is saving you time, and a supplier that hides any of them is giving you a reason to look elsewhere.

Tissue Repair Research Peptides

This is the most active category in preclinical peptide research, led by two compounds that are often studied together.

BPC-157 peptide is a 15-amino-acid sequence studied mainly in rodent models of tendon, ligament and gastrointestinal injury. It is available in 5mg and 10mg vials. TB-500 peptide is a synthetic fragment related to thymosin beta-4, studied for its role in cell migration and wound closure models, and is supplied as a 10mg vial.

Researchers who want both in one vial usually look for the Wolverine stack peptide, a pre-blended 10mg vial with 5mg of BPC-157 and 5mg of TB-500. A fixed 1:1 blend removes the step of combining two vials and keeps the ratio identical across samples.

Two smaller compounds round out the category. KPV peptide is a three-amino-acid fragment of alpha-MSH studied in inflammation signaling models, and ARA-290 peptide is an 11-amino-acid peptide derived from erythropoietin that is studied for tissue-protective signaling without the blood-cell effects of the parent molecule.

Copper Peptides and Multi-Peptide Blends

GHK-Cu peptide is a copper-binding tripeptide and one of the most widely published peptides in skin and wound-model research. It is sold in larger vials than most peptides, typically 50mg and 100mg, because the working amounts in published protocols are higher.

Two named blends build on it. The GLOW peptide blend combines GHK-Cu with BPC-157 and TB-500 in a single 70mg vial. The KLOW peptide blend adds KPV to the same three compounds in an 80mg vial. Blend names are not standardized across the industry, so always confirm the per-component milligram amounts on the listing and the COA instead of relying on the name.

GHRH and Secretagogue Research Peptides

Peptides in this group are studied for how they act on the GHRH receptor and the ghrelin receptor. Ipamorelin peptide is a selective ghrelin-receptor agonist supplied as a 10mg vial. It is most often paired with a GHRH analog, which is why the CJC-1295 Ipamorelin blend is one of the most searched combinations in the field. The blended vial contains 5mg of CJC-1295 without DAC and 5mg of Ipamorelin. Check the DAC status on any CJC-1295 listing, because the DAC and No DAC forms have very different half-lives and are not interchangeable in a protocol.

Tesamorelin peptide is a stabilized GHRH analog with a large published literature and is supplied as a 10mg vial. Further downstream, IGF-1 LR3 is a modified form of IGF-1 with an extended half-life that is widely used in cell-culture work, sold in 1mg vials because of its potency.

Metabolic Research Peptides

Incretin-pathway compounds dominate this category. Semaglutide peptide is a GLP-1 receptor agonist and Tirzepatide peptide is a dual GIP and GLP-1 receptor agonist. Both are supplied as 10mg research vials and both are the subject of a very large body of published work.

Outside the incretin family, AOD-9604 is a modified fragment of the C-terminal region of hGH studied in lipid metabolism models. 5-Amino-1MQ is a small molecule, not a peptide, that inhibits the enzyme NNMT and is studied in adipocyte models. MOTS-c peptide is a 16-amino-acid peptide encoded in mitochondrial DNA and studied for its role in metabolic regulation.

Mitochondrial and Cellular Research Compounds

NAD+ is a coenzyme central to cellular energy metabolism and is sold in 500mg vials for research use. SS-31 peptide is a four-amino-acid peptide that targets cardiolipin in the inner mitochondrial membrane and is studied in models of mitochondrial dysfunction. Glutathione is a tripeptide antioxidant supplied in 1500mg vials and is one of the most commonly used reference compounds in oxidative stress research.

Neuropeptide Research

Semax peptide is a synthetic analog of an ACTH fragment and Selank peptide is a synthetic analog of tuftsin. Both were developed in Russia, are usually compared side by side, and are supplied as 10mg vials. DSIP peptide is a nine-amino-acid neuropeptide first isolated in sleep research in the 1970s and is supplied as a 5mg vial.

Melanocortin Research Peptides

Three compounds act on the melanocortin receptor family. Melanotan 1 is a linear alpha-MSH analog with high selectivity for the MC1 receptor. Melanotan 2 is a shorter cyclic analog that binds several melanocortin receptors. PT-141 peptide is a metabolite of Melanotan 2 that acts mainly at MC3 and MC4 receptors. All three are supplied as 10mg vials, and because their names are so similar, the COA is the reliable way to confirm which one a vial contains.

Research Peptide Price and Vial Size Reference

Prices below are the listed prices at the time of writing and are included so vial sizes can be compared on a cost-per-milligram basis.

Frequently Asked Questions

Where is the best place to buy research peptides online?

The best supplier is the one whose claims you can verify before paying. Look for exact vial contents, a stated test method, a readable Certificate of Analysis and clear research-use-only labeling. HEEZ Research publishes third-party test results on its product pages and ships orders placed before the daily cutoff the same day.

Is it better to buy a blend or separate vials?

A pre-blended vial gives a fixed ratio and one reconstitution step, which helps consistency across samples. Separate vials give control over the ratio. The choice depends on whether the study design needs the ratio to vary.

Why do vial sizes differ so much between compounds?

Vial size follows the working amounts used in published research. Potent compounds such as IGF-1 LR3 are sold in 1mg vials, while GHK-Cu, NAD+ and glutathione are sold in vials of 50mg to 1500mg.

What purity should a research peptide have?

Most research suppliers state 98% or 99%+ purity by HPLC. The number only means something when it is backed by a COA from an independent laboratory that names the lot and the test method.

Final Thoughts

The compound you need determines where you should buy it. Match the exact form, vial size and blend composition to the study first, then confirm the testing behind the listing. A catalog that documents every compound the same way makes that comparison quick, which is the practical reason to source a full protocol from one supplier.

All compounds discussed in this article are sold for laboratory research use only. They are not drugs, supplements or cosmetics, and are not intended for human or veterinary use.

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