The molecules
What each peptide is: sequence, class, salt form, naming, and its regulatory status on a given date. Never what it does in a person.
- The moleculesTB-500 and thymosin beta-4 are not the same moleculeThymosin beta-4 is a 43-residue protein. TB-500 is a seven-residue synthetic fragment of it. Here is the identity of each, the thymosin alpha-1 mix-up, and the status of all three as of September 2026.
- The moleculesSermorelin, tesamorelin, ipamorelin and CJC-1295 comparedThree of these are GHRH analogues; ipamorelin is a five-residue ghrelin-receptor ligand. One had an approved product that was discontinued, one has an approved product on the market, two have none. Identity and status side by side.
- The moleculesSemax and Selank: two heptapeptides and their US statusSemax (MEHFPGP) is four residues of ACTH plus a Pro-Gly-Pro tail; Selank (TKPRPGP) is the tetrapeptide tuftsin plus the same tail. Where each came from, what the spelling variants mean, and their status as of September 2026.
- The moleculesNAD+, 5-amino-1MQ and glutathione: which are peptides?Three catalog staples that share a shelf with peptides. Only one is a peptide. What each molecule actually is, from PubChem, and why the distinction changes what a certificate should show.
- The moleculesMelanotan II, PT-141 and afamelanotide: one parent, three analoguesAfamelanotide, Melanotan II and bremelanotide all descend from the 13-residue hormone alpha-MSH. Two became approved drugs; Melanotan II never did. Structures, lineage, FDA's own words on MT-II, and status as of September 2026.
- The moleculesHow to read a peptide sequenceThe one- and three-letter codes, which end is which, what Ac- and -NH2 mean, how D-residues, rings and lipids are written, and four worked examples from the catalog.
- The moleculesGHK-Cu: why the powder is blue and what copper peptide meansGHK-Cu is the tripeptide glycyl-histidyl-lysine holding one copper(II) ion. The copper is what makes it blue, what makes it a different molecule from GHK, and what its two INCI names are about. Status as of September 2026.
- The moleculesEpithalon, epitalon and the word bioregulatorOne tetrapeptide, four spellings, and a term that is not a pharmacological class. What AEDG is, where it came from, what the Khavinson school means by bioregulator, and its US status as of September 21, 2026.
- The moleculesCJC-1295 with DAC and without: what the drug affinity complex changesCJC-1295 is a 30-residue GHRH analogue carrying a maleimide group that bonds to serum albumin. The version sold without DAC is a different, 29-residue molecule. Identity, lineage and 2026 status.
- The moleculesCagrilintide is an amylin analogue, not a GLP-1Cagrilintide descends from the pancreatic hormone amylin, not from GLP-1. What the molecule is, how it was engineered, why it is paired with semaglutide in trials, and its status as of September 21, 2026.
- The moleculesThirty-nine residues and a fatty acidWhy the metabolic analogues are all roughly the same length, what the diacid on the lysine is doing there, and why they cost what they cost.
- The moleculesThe two-residue peptidesAt the other end of the shelf from the metabolic analogues sit chains of two, three and four amino acids. Almost everything about them is different.
- The moleculesWhere the word peptide stops meaning anythingA working definition, the boundary with proteins, and the two things in this catalog that are not peptides at all.
Other shelves
- Reading the paperworkWhat each line on a certificate measures, and what a weak one leaves out.15 pieces
- How it is madeSynthesis, freeze-drying, formulation and format: how a peptide becomes the vial, spray or strip on the shelf, and where the cost goes.4 pieces
- HandlingStorage, stability and the arithmetic of a stock solution.7 pieces
- Where the line isWhat this site will and will not say about the material it sells, and why.11 pieces
- Sourcing and provenanceWhere research peptides come from, how to check a vendor with documents, and what an importer and a buyer are actually responsible for.5 pieces
Nothing here is medical advice. Everything on this site is supplied for laboratory research use only.