Certificates of analysis

This is what your
COAs come with.

We only do purity COAs. Every lot is third-party HPLC tested before it ships, and your certificate carries your company name with the purity result for the exact batch in your hands — the document you hand a customer when they ask "how do I know this is real?"

Sample PurpleDirect certificate of analysis: lot number, client, HPLC purity 98.99% and analyst signature

Real third-party test report — your company name in the client field

What's on every certificate

We only issue purity COAs — here's exactly what that means.

HPLC purity

Chromatogram plus the numeric purity result for the exact lot you received. Typically ≥ 99%.

Purity COAs only

We issue purity certificates — that's it. We don't sell sterility or endotoxin documents.

Third-party lab

Testing is run by an independent lab, with the analyst sign-off printed on the report.

Batch traceability

Lot number, test date, and analyst sign-off — so a COA can always be matched back to a vial.

Your company name

COAs are issued referencing your brand, so what you hand a customer looks like it came from you.

Independent testing welcome

Send any batch to a lab of your choosing at any time. We have nothing to hide on a single lot.

The questions we get asked most

Will my company name actually appear on the COA?

Yes. COAs are prepared referencing your brand so you can pass them straight to your customers without our name being the headline.

Do you offer sterility or endotoxin COAs?

No — we only do purity COAs. Every certificate we issue is an HPLC purity report for the specific lot you received.

Do I get a COA for every order automatically?

Every batch we ship has testing behind it. Branded COA documents are ordered as a line item at checkout — add 'Purity COA' for any product you've purchased.

I already ordered — can I add COAs after the fact?

Yes. You can order COAs on their own for any product your account has previously purchased. COA-only orders have no shipping charge and no order minimum.

How fast do COAs arrive?

Once uploaded to your order they appear in your dashboard and you get an email immediately. Most are ready within a couple of business days.

Can I test the batch myself?

Always. Use any third-party lab you want — our results should match.

Want COAs on your next batch?

Add a Purity COA to any product you've bought from us. COA-only orders ship free with no order minimum, and land in your dashboard the moment they're ready.