Guides
How to check a vendor, read a certificate of analysis, compare prices fairly and understand the law, without the sales pitch.
Gray-Market GLP-1s: Semaglutide, Tirzepatide, Retatrutide
How research-labelled GLP-1 products differ from approved and compounded medicines, and what FDA warnings, seizures and lab tests show about the risks.
How to Compare Peptide Prices Per Milligram
Why sticker prices mislead, how to work out cost per mg, how kits, blends, shipping and peptide content change the real price, and how our index works.
How to Read a Peptide COA and Spot a Fake
What each part of a peptide certificate of analysis means, how to verify a report with the lab that issued it, and the signs of a recycled or forged COA.
How to Tell if a Peptide Vendor Is Legit: 6 Checks
Six checks to run in about 15 minutes: domain age, COAs, the lab, company identity, policies and payment protection, plus the scam patterns to watch for.
Look-Alike Peptide Vendor Sites: How to Spot Them
When a peptide vendor closes, look-alike sites reuse its name or domain. The cases we've documented, the patterns behind them and a five-minute check.
Peptide Testing Explained: HPLC, LC-MS and More
What HPLC, mass spectrometry, quantity, endotoxin, microbial and heavy-metal tests can and can't tell you, and why one vial is not a verdict on a vendor.
Peptide Vendor Shutdowns: What Happened and What to Do
A sourced record of research-peptide vendor closures, seizures and prosecutions since 2024, and the checks to run when a vendor suddenly goes dark.
Research Peptide Legal Status: US, UK, EU, CA, AU
A sourced, dated overview of how US, UK, EU, Canadian and Australian regulators treat research peptides, including personal import rules. Not legal advice.
What 'Research Use Only' Means on Peptides
Where the RUO label comes from, why peptide sellers use it, and what regulators in the US, Canada, Australia and Europe say about products sold with it.
Peptides compared
Two compounds side by side: what each is, how the evidence compares, and their legal status by market, with sources. No dosing or usage instructions. For vendors compared head to head, see vendor comparisons.