About

About PeptideCOACheck

PeptideCOACheck is an independent, free educational tool that helps people read and sanity-check Certificates of Analysis (COAs) for research peptides. It explains what a COA should contain, checks the numbers you enter against reference data, and points out what to verify with the testing lab.

What we do, and what we don't

• We do: publish guides on reading COAs, maintain a reference table of molecular weights cross-checked against public databases, and run a checker that applies the published rules on our methodology page.
• We don't: test products, operate a lab, verify individual reports, rate or approve vendors, or give medical, dosing or usage advice.
• Privacy: the checker runs entirely in your browser. Nothing you type is uploaded or stored. See our privacy policy.

Who runs this site

PeptideCOACheck is run by an independent publisher. It isn't owned by, or run on behalf of, any laboratory, peptide vendor or manufacturer. We don't present the site as the work of credentialed scientists or clinicians, and we don't publish invented author bios. Our content is built from public reference sources, which are cited on each guide and peptide page, so you can check our work rather than take it on trust.

How the site is funded: affiliate disclosure

The site is funded by an affiliate partnership with Peplogix, a research-peptide vendor. If you buy through our links, or use code XTIAN, we may earn a commission at no extra cost to you. Affiliate links are marked "Ad" or labeled as affiliate links, and use rel="sponsored".

What this means in practice:

• The checker treats every COA the same way, whoever issued it. There is no special handling for Peplogix products.
• Our guides don't rank vendors, and we don't describe Peplogix or anyone else as "verified" or "approved".
• We encourage you to apply our vendor COA checklist to Peplogix exactly as you would to any other seller.

The full legal wording is in our affiliate disclosure.

Editorial policy

These standards apply to every guide, peptide page and checker rule on PeptideCOACheck:

1. Sources first. Chemical facts such as formulas and masses come from public databases (PubChem, or KEGG DRUG where PubChem has no record), and each page lists its sources. If we can't confirm a compound's structure in a public database, we don't include it.
2. Published rules. Every threshold the checker uses is documented on the methodology page. Guides describe the same thresholds the checker applies.
3. Industry practice is labeled as such. Benchmarks like "98% HPLC purity" are described as common research-market practice, not official standards.
4. No medical or dosing content. We write about laboratory documents and analytical chemistry only. We don't make claims about effects, benefits or uses in humans or animals.
5. No fake reviews or ratings. We don't publish testimonials, star ratings or review markup, because we have none to show.
6. Independence from commercial interests. Our affiliate partner doesn't review, approve or edit our content, and we don't accept payment for coverage.
7. Labs and companies named as examples only. When we name a lab, it's to show how something such as report verification works, after confirming from the lab's own published information that it does what we describe. Naming isn't endorsement in either direction.
8. Dates. Each guide and peptide page shows when it was last updated. We review pages when reference data, checker rules or common practice change.

Corrections

If you find an error, such as a wrong mass, a broken source link, or a rule that doesn't match the checker's behavior, we want to fix it. A dedicated contact address for corrections is being set up and will be listed here. Confirmed errors are corrected promptly, and the page's "Last updated" date changes when its content changes.

Educational content only. Not medical advice. Research peptides are sold for laboratory research purposes only.