A Certificate of Analysis, or COA, is the single most useful document for deciding whether a hemp product is what it claims to be. It is the third-party lab report that tells you what is actually in the bottle. The catch is that COAs look intimidating, so most shoppers never read them. This guide breaks one down section by section so you can read it in about two minutes and buy with confidence.
This is general educational information, not medical or legal advice.
What a COA is and why it exists
A COA is a report from an independent testing laboratory that analyzed a specific batch of product. For hemp products it confirms two things: how much of each cannabinoid is present (potency) and that the product is free of harmful contaminants (safety). A trustworthy brand publishes a batch-specific COA for every lot, which is exactly what our COA directory does, indexed so you can match the number on your label. If a brand cannot show you a COA you can read, that is the biggest red flag there is.
The five things to check on any COA
1. The lab is independent and accredited
Look for the testing laboratory’s name and, ideally, an accreditation reference such as ISO/IEC 17025, the international standard for testing-lab competence. The lab should be a third party, not the brand’s in-house operation. An accredited, independent lab is the foundation of a trustworthy result.
2. The batch number matches your product
A COA is only valid for the batch it tested. Find the batch or lot number on the COA and confirm it matches the number printed on your product. A COA for a different batch tells you nothing about the jar in your hand. This is the most important single check, so do it first.
3. The potency / cannabinoid panel
This section lists each cannabinoid and how much was found, usually as a percentage and as mg per unit. Check two things:
- Does it match the label? If the label says 30 mg per dropper, the panel should back that up within a reasonable tolerance.
- The delta-9 THC result. For a hemp product, delta-9 THC should be at or below the 0.3% dry-weight legal limit. If you are avoiding THC entirely (for drug testing, for example), look for “non-detect” or “ND.”
“ND” or “<LOQ” means the compound was below the level the lab could reliably measure, which is effectively “none detected.”
4. The contaminant / safety panels
This is the part shoppers skip and should not. A complete COA tests for contaminants and shows a clear pass/fail against action limits. Look for:
- Pesticides (pass/fail)
- Heavy metals (lead, arsenic, cadmium, mercury, pass/fail)
- Residual solvents (leftover from extraction, pass/fail)
- Microbials (bacteria, mold, pass/fail)
- Mycotoxins (mold toxins, pass/fail)
A product can be perfectly potent and still fail safety testing. If a “COA” shows only potency and no contaminant panels, it is incomplete.
5. The date and signature
Check the test date (a very old COA on a fresh product is a question mark) and look for an authorized signature or approval from the lab. These confirm the report is real and current.
The 30-second red-flag checklist
- No COA available at all.
- A COA whose batch number does not match the product.
- Potency that does not match the label.
- Only a potency panel, with no contaminant testing.
- The lab is the brand itself, with no third-party name.
- No test date or signature.
If you hit any of these, slow down and ask the brand for a complete, batch-matched, third-party COA.
How our COA directory works
Every product lot we sell is published in our COA directory, indexed by batch number, so you can match the number on your label to the exact lab report for that lot. That is the practical payoff: you do not have to take a marketing claim on faith. You can read the lab result yourself. This applies to our cannabinoid products and to our zero-cannabinoid hemp protein, which carries its own lab letter.
A note on claims and safety
A COA documents what is in a product; it does not make the product a medicine. We describe how to read lab results, not conditions any product treats. If you are pregnant, nursing, taking medication, subject to drug testing, or managing a health condition, talk to your healthcare provider before using any hemp or supplement product.
Frequently asked questions
What does a COA actually prove? It documents, for one specific batch, how much of each compound is present (potency) and that the product passed contaminant testing (safety). It is the evidence behind a label’s claims.
What should I check first? That the batch number on the COA matches the batch number on your product. A COA for a different batch does not describe what you actually bought.
What does “ND” mean on a COA? “ND” means “not detected,” that is, the compound was below the level the lab could reliably measure. For delta-9 THC, an ND result is what shoppers avoiding THC look for.
Why should I care about the contaminant panels? Because a product can be accurately potent yet still contain pesticides, heavy metals, solvents, or mold. The safety panels confirm it is clean, not just strong.
What makes a testing lab trustworthy? An independent, third-party lab, ideally accredited to ISO/IEC 17025, with a dated, signed report. Avoid in-house-only testing with no third-party name.
These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.