Vetting a vendor

A clean COA means little if the seller behind it isn’t real, accountable or consistent. This lesson is about checking the business, not the bottle.

Start with who they are

A legitimate seller can tell you who they are. Look for:

• A named business, not just a brand name. Check it against your country’s business registry where you can.
• A way to reach a person: an email that gets answered, ideally a business address or jurisdiction.
• Clear terms: shipping, returns, and what happens if something arrives wrong.

Anonymity isn’t proof of a scam, but it removes every way you’d have to resolve a problem.

How they handle documentation

Apply what you learned in Reading a COA to the seller’s habits, not just one document:

• Is there a COA per batch, or one report reused across everything?
• Does the lot number on the COA appear on the product itself?
• Is testing done by an independent lab, and can you verify the report without going through the seller’s site?
• When batches change, do the documents change with them?

A seller who documents consistently is showing you their process. One polished report on the homepage is showing you marketing.

Watch what they claim

Products sold “for research use only” shouldn’t come with health promises. A seller who pairs a research-use disclaimer with treatment claims, before-and-after stories or usage instructions is contradicting their own label, and that tells you how carefully they operate.

Ask them a question

Before you buy anything, email a specific question: “Can you send the COA for lot ___?” or “Which lab tested this batch?” Then judge:

• Did a person answer, and how fast?
• Was the answer specific, or a copy-paste?
• Did they send the document, or dodge?

It costs you nothing, and it’s the most honest test of a seller you’ll get.

Reviews: check outside the site

Reviews on a seller’s own site are curated by the seller. Look for discussion elsewhere, and weigh detail over volume. A few specific reviews describing an order tell you more than a wall of five-star one-liners.

Know your payment protection

Different payment methods offer different recourse. Card payments and some payment platforms have dispute processes. Bank transfers and crypto generally don’t: once sent, money is hard to recover. That isn’t a verdict on any seller, but you should know which kind of protection you have before you pay.

Red flags

• No business name, contact, or terms.
• One COA for every product or batch.
• Health or treatment claims on research-use products.
• Prices far below every other seller, with no explanation.
• Pressure tactics: countdown timers, “last chance” stock warnings on everything.
• Questions about testing go unanswered.

The checklist

• Identifiable business with working contact
• Clear shipping and return terms
• Batch-specific COAs with lot numbers on the product
• Independent, verifiable testing
• No health claims on research-use products
• Answered a direct question clearly
• Reviews you can find outside their site
• You know what protection your payment method gives you

Next up: you can read a COA and vet a seller. Next, Third-party testing explained covers what independent testing actually involves, and why it matters who does it.