How to read a CBD Certificate of Analysis (COA)
What each section means, and exactly what to check before you buy.
Key takeaways
- ✓A COA is an independent lab report for one specific batch , match its batch number to your product.
- ✓Check potency: measured CBD should be close to the label claim (around 90–110%).
- ✓Confirm THC is compliant (below 0.2%) , especially on full-spectrum.
- ✓Look for "Pass" on heavy metals, pesticides, residual solvents, microbials and mycotoxins.
- ✓No COA, an old COA, or a COA for a different batch are all red flags.
A Certificate of Analysis is the single most useful document in CBD. It is an independent laboratory’s report on one production batch, and it turns marketing claims into measured facts. Here is how to read one in under a minute.
1. Match the batch number
A COA only describes the batch it tested. Find the batch or lot number on your product and confirm it matches the one on the certificate. A certificate for a different batch tells you nothing about what is in your bottle.
2. Check the potency
The cannabinoid table shows measured CBD in mg per unit and mg/g. Compare it to the label claim , a well-made product lands roughly 90–110% of what the front of the pack promises. Far below means you are under-dosed; far above can mean inconsistent manufacturing.
3. Confirm the THC is compliant
On full-spectrum products there will be a small THC figure; it should read below 0.2% (or "ND" / not detected on broad-spectrum and isolate). This is what keeps the product legal and non-intoxicating.
4. Read the safety panels
Below potency you will find contaminant screens. Each should say Pass or report a result under its limit:
- Heavy metals (lead, arsenic, cadmium, mercury)
- Pesticides
- Residual solvents
- Microbials (E. coli, salmonella, yeast & mould)
- Mycotoxins
Frequently asked
- What does ND mean on a COA?
- "Not detected" , the compound was below the lab’s limit of quantitation. It is the result you want for THC on broad-spectrum/isolate and for contaminants.
- How recent should a COA be?
- It should correspond to the batch you are buying. Batch numbers rotate, so a current product should link to a recent, matching certificate.
- Who should issue the COA?
- An independent, accredited third-party laboratory , not the brand’s own kitchen. Look for ISO/IEC 17025 accreditation.
This article is general educational information and not medical advice. CBD is a food supplement and is not intended to diagnose, treat or cure any condition. Consult a healthcare professional if you take other medication.
