Comparing Research Compounds

Published August 21, 2026 · Artemis Labs

Research Buyer FAQ › Comparing Research Compounds

This page is a map, not the destination. Each answer says in a few sentences how two compounds differ in class and structure, then sends you to the full comparison or to the two product pages, where the citations live. Nothing here describes an outcome in a person. All material is supplied for laboratory research use only.

How this page was built. Comparisons here are structural — sequence origin, receptor family, composition. Sequence, CAS and receptor citations sit in the References section of each linked page.

BPC-157 vs TB-500 — what is the difference?

They are different molecules from different origins. BPC-157 is a synthetic sequence derived from a protein found in gastric juice. TB-500 is a fragment of thymosin beta-4, a protein found in many tissues. Different parent molecules, different pathways in the published tissue-repair work. The side-by-side is BPC-157 versus TB-500.

Retatrutide vs tirzepatide — what is the difference?

Receptor count. Tirzepatide is described in the literature as binding two receptors, GIP and GLP-1. Retatrutide is described as binding three, adding the glucagon receptor. That structural difference is what separates them. The full comparison, with sequences and citations, is tirzepatide versus retatrutide.

CJC-1295 vs sermorelin — what is the difference?

Both act at the same receptor; they differ in structure and how long they survive. Sermorelin is GHRH(1-29), the first 29 residues of natural growth-hormone-releasing hormone. CJC-1295 is a modified analog of that sequence, built to resist breakdown for longer. The detail is in CJC-1295 versus sermorelin.

Semax vs Selank — what is the difference?

They are unrelated sequences that share a research origin. Both came out of Russian institutes, and both are short peptides. Semax is an analog of the ACTH(4-10) fragment. Selank is an analog of tuftsin, a small immune peptide. Different parent molecules, different literatures. Compare Semax and Selank.

MOTS-c vs SS-31 — what is the difference?

One is natural, one is designed. MOTS-c is encoded inside mitochondrial DNA, so cells make it themselves in the mitochondria — the part of a cell that produces its energy. SS-31 is a synthetic four-residue peptide that binds cardiolipin, a lipid in the inner mitochondrial membrane. Compare MOTS-c and SS-31.

Sermorelin vs CJC-1295 vs ipamorelin — what is the difference?

It is two families, not three variants. Sermorelin and CJC-1295 are both GHRH analogs and act at the GHRH receptor. Ipamorelin is not a GHRH analog at all — it acts at the ghrelin receptor, a separate target. The GHRH pair is compared in CJC-1295 versus sermorelin.

What is the difference between GLOW and KLOW?

KLOW is GLOW with a fourth component. GLOW contains GHK-Cu, BPC-157 and TB-500. KLOW contains those three plus KPV. Everything else about the two vials follows from that single difference. Component amounts per sealed vial and CAS numbers are listed on GLOW and KLOW.

Tesamorelin vs sermorelin — what is the difference?

Length and modification. Both are GHRH analogs. Sermorelin is GHRH(1-29), the natural fragment. Tesamorelin is based on the longer GHRH(1-44) sequence with a chemical group attached at one end to slow its breakdown. Same receptor family, different molecules. Compare Tesamorelin and Sermorelin.

PT-141 vs Melanotan-2 — what is the difference?

Receptor selectivity, and nothing else belongs in this answer. Melanotan-2 binds across the melanocortin receptor family — MC1R, MC3R, MC4R and MC5R. PT-141, also called bremelanotide, is a related molecule with a preference for MC4R. Compare PT-141 and Melanotan-2 for the receptor selectivity detail.

compound classes and how they differ — the class-level definitions behind these comparisons.
Peptide Purity, Testing & Stability — what the analytical figures on each product page mean.

This page is one section of the full Artemis Labs research-buyer FAQ.

References

Sequence origins, CAS numbers and receptor citations for each compound sit in the References section of its product page and of the comparison guide linked beside it: