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Research peptides vs. bioregulators: how the categories differ

How the PepDistro catalog is organized, and what separates short bioregulator peptides from other research peptides.

PepDistro · Updated October 2026 · 5 min read

Four categories

CategoryWhat's in itExamples
Research peptidesSynthetic peptides, from 3 to 80+ amino acids, often with modificationsBPC-157, TB-500, KPV, MOTS-c
BioregulatorsVery short peptides of 2–4 amino acids, plus one thymic peptide fractionEpithalon, Pinealon, Cartalax
Peptide blendsTwo or more peptides co-filled in one vialBPC / TB blend, GLOW70, KLOW80
Other compoundsSmall molecules and non-peptide compoundsAICAR, NAD+, Glutathione

Research peptides

Most research peptides are synthetic analogs or fragments of naturally occurring sequences. Many carry modifications that change their chemistry: N-terminal acetylation, C-terminal amidation, D-amino acids, non-standard residues such as Aib or Nle, disulfide or lactam rings, or fatty-acid side chains. Each product page lists the full sequence with its modifications, the formula, molecular weight and CAS number.

Bioregulators

Bioregulators are very short peptides, typically two to four amino acids. The category comes from research led by Vladimir Khavinson and colleagues in Russia, which began with peptide fractions extracted from tissues and later moved to short synthetic sequences.

  • Epithalon: Ala-Glu-Asp-Gly, a tetrapeptide
  • Pinealon: Glu-Asp-Arg, a tripeptide
  • Cartalax: Ala-Glu-Asp, a tripeptide
  • Thymalin: a thymic polypeptide fraction rather than a single sequence

Because they are so short, bioregulators are simple to characterize by HPLC and mass spectrometry, and the compound pages show their full structures.

Blends

Blends combine two or more peptides in one vial, filled together and lyophilized as one. Each blend page lists its components and their proportions. The lot CoA covers the blend as filled. Our Signature line adds blends formulated in-house.

Not seeing a compound?

If a compound isn't in the catalog, request it. We'll tell you whether we can supply it for research use.

More guides

All guides
DocumentationHow to read a Certificate of Analysis7 min readTestingHPLC, mass spec and endotoxin: peptide testing explained8 min readBuyingHow to qualify a wholesale peptide supplier6 min read

PepDistro products are for laboratory research use only and are not for human or veterinary use. This guide is general information about documentation and supply. It does not describe or recommend any use of these products.