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Research library
The peptide research library
One place for the reference material on this site: compounds set side by side, guides to certificates and testing, regulatory status with dates, and every compound we stock with its certificates. It describes what the materials are and how they are documented. It does not say what they do in a person, and it carries no use guidance.
Research references
One compound each, documented in full: identity, dated regulatory status, structure, testing and every certificate on file.
- What is retatrutide? A research referenceRetatrutide (LY3437943) is Lilly’s investigational triple agonist at the GIP, GLP-1 and glucagon receptors. Identity, dated FDA status, structure, certificates.
- What is tirzepatide? A research referenceTirzepatide (LY3298176): a 39-residue GIP and GLP-1 receptor agonist. Identity, residue map, dated FDA timeline, every lot certificate, mass spec values.
Comparisons
Two or three compounds, one table: identifiers, formula, molecular weight, chain length, form, storage and certificates.
Check a lot number
Every certificate in the testing library can be found by the lot number on the label. Verify a lot number, or browse all 64 current certificates.
Start here
- How to read a certificate of analysisWhat each line on a COA is actually measuring, in the order it matters, and the four things a weak certificate leaves out.
- Net peptide content, and the 18% error nobody catchesWhy the milligrams on the label are not the milligrams of peptide, and what that does to a concentration you already wrote down.
- Purity is not potencyHPLC, mass spectrometry and Karl Fischer each answer a different question. Three suppliers quoting "99%" may be quoting three different things.
- How to vet a peptide vendor with documents, not with forumsA document-by-document checklist for judging a research peptide supplier: lot-specific certificates, identity as well as purity, net peptide content, a named manufacturer and a verifiable laboratory.
- Are peptides legal in the US? A dated answer for 2026Peptides are not controlled substances, and research use only sale is lawful when nothing points to use in people. Approval, compounding, supplements, import, retatrutide and sport, each dated.
- FDA approved peptides in 2026: a status table with dates and sourcesWhich peptides have an FDA-approved product, which are investigational and which have neither, as of October 21, 2026. Every row carries a date and a primary source, with short answers for ipamorelin, BPC-157 and retatrutide.
- A peptide paperwork glossaryThirty-six entries for the terms that appear on peptide certificates, labels and regulatory pages, each defined in one to three sentences from a primary source and linked to the piece that explains it.
- What minus twenty is actually forCold slows three different degradation routes at three different rates, and one of them is not slowed by cold at all.
Guides by subject
- Reading the paperwork (18)What each line on a certificate measures, and what a weak one leaves out.
- How it is made (4)Synthesis, freeze-drying, formulation and format: how a peptide becomes the vial, spray or strip on the shelf, and where the cost goes.
- Handling (7)Storage, stability and the arithmetic of a stock solution.
- Where the line is (16)What this site will and will not say about the material it sells, and why.
- Sourcing and provenance (6)Where research peptides come from, how to check a vendor with documents, and what an importer and a buyer are actually responsible for.
- The molecules (18)What each peptide is: sequence, class, salt form, naming, and its regulatory status on a given date. Never what it does in a person.
Every compound
For laboratory research use only. Not a drug, not a supplement, not for human or veterinary use.