Vendor-check guide · Research use only · Not for human or animal use · 18+
Coupons Peptides

A vendor-check guide

Read the paperwork. Then compare the price.

A plain-English guide to checking research-peptide vendor paperwork, questioning reviews, spotting red flags and understanding discount codes.

Start the 3 checks Browse discount codes

A code can lower a price; it cannot establish quality or safety.

Evidence-led guidesChecks on what to look for, not who to buy from.
Sources linkedTesting and regulation statements link to official bodies or peer-reviewed papers.
Not vendor endorsementsCodes are paid links. Being listed isn't a recommendation.

Three checks

What to verify before you trust a listing

This guide is about products sold for laboratory research use only. It says nothing about using any product, and it doesn't rate or recommend vendors.

Check 01

Read the certificate of analysis

Does it belong to your batch, and can you find the lab that wrote it?

  • A lot number that matches your packaging
  • A named lab you can look up
  • A method named for every result
Read check 01 Check 02

Question the reviews

What US law now bans, and the patterns that give fakes away.

  • Bursts of near-identical five-star reviews
  • Reviews describing effects in people
  • Paid links with no disclosure
Read check 02 Check 03

Know the red flags

Paperwork, claims and payment requests that should make you stop.

  • Certificates only after you pay
  • Crypto, wire or gift-card payment only
  • Countdown timers and pressure to buy
Read check 03

Educational checklist

Before you trust a listing

Use this list to organise your questions, not to certify a vendor. Missing information is a reason to investigate further, not proof by itself of wrongdoing.

Your progress

0/6

0 of 6 checks reviewed

This is a list of questions, not a pass/fail test or a certification. Your ticks are saved only in this browser.

Certificate anatomy

What to find on a certificate of analysis

  1. Batch or lot matchThe lot number on the certificate matches your packaging.
  2. Named testing labA lab you can find and contact, not only the seller.
  3. Test dateWhen the testing was done.
  4. MethodEach result names the test used to get it.
  5. Results and limitsUnits, and the limit each result was checked against.

A certificate is a starting point, not a guarantee. A document alone can't establish safety, authenticity, suitability or legality, so look the lab up and check the claims yourself.

Read the full certificate guide

Discount codes

Looking for a code?

Search the vendor codes we list. Each one is a paid link, and a code can lower a price; it cannot establish quality or safety.

Evidence and transparency

How this guide works