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Education
17 April 2026
7 min read

How to Read a Certificate of Analysis

What your CBD brand's lab report actually tells you — and what it doesn't.

If a CBD brand can't show you a certificate of analysis (COA) for the specific product you're buying, stop there. Everything else — the branding, the testimonials, the Instagram presence — is irrelevant if they can't prove what's in the bottle.

But having a COA isn't enough. You need to know how to read one. Most CBD consumers have never been shown how, which is convenient for brands with something to hide.

What a COA is

A certificate of analysis is a document produced by an independent laboratory after testing a sample of the product. It reports what's in the sample and, crucially, what isn't.

The key word is "independent." A COA from the brand's own facility is not a COA — it's a marketing document. The laboratory should be a third party, ideally ISO/IEC 17025 accredited, which means their testing methods and procedures have been independently verified.

The five things to check

1. CBD content — does it match the label? The COA should state the CBD concentration per ml or per bottle. Compare this to what's on the label. Industry research has found that over 60% of UK CBD products are mislabelled — some by more than 50%. If the COA says 3.2% and the label says 5%, you're being misled.
2. Full cannabinoid profile A good COA doesn't just test for CBD. It reports the full spectrum of cannabinoids: CBDa, CBG, CBN, CBC, and THC (including THCa). This matters because: - If only CBD is present and everything else is zero, it's almost certainly isolate — not full spectrum, regardless of what the label says. - The presence of minor cannabinoids at low levels confirms genuine whole-plant extraction.
3. THC compliance In the UK, the THC content must be below 0.2%. The COA should confirm this with a specific measurement, not just a "pass/fail" statement. Look for the actual number — it should be reported as a percentage or in mg/ml.
4. Contaminant screening A thorough COA tests for: - Heavy metals (lead, mercury, cadmium, arsenic) - Pesticides and herbicides - Residual solvents from the extraction process - Microbiological contamination (mould, bacteria) If any of these sections are missing, the testing is incomplete. Hemp is a bioaccumulator — it absorbs whatever is in the soil, including heavy metals. Testing is not optional.
5. Batch specificity The COA should reference a specific batch number that matches your product. If a brand shows one COA for all products, or the batch number on the COA doesn't match the one on your bottle, the report is meaningless. It's telling you about a different product.

Red flags

Here's what should concern you:

No COA available at all. Walk away. This is the minimum standard.

COA from the brand's own lab. Not independent. Not reliable.

COA older than 6 months. Products degrade. Formulations change. The COA should be recent.

Only CBD tested. A "cannabinoid profile" with only one cannabinoid is not a profile.

No contaminant testing. This is the part brands skip when they want to save money. It's also the part that matters most for your safety.

Batch number missing or non-matching. The whole point is traceability.

What we do differently

Every Aponia order includes a certificate of analysis specific to your batch. Not a generic report from our website — the actual document for the specific production run your oil came from.

Our testing is conducted by an independent European laboratory. The report covers the full cannabinoid profile, THC compliance, heavy metals, pesticides, residual solvents, and microbiological contaminants.

We do this because it's the right thing to do. It's also expensive, and it's one of the reasons we only make one product — per-batch testing across a wide range would be prohibitively costly for a small brand. One product, tested properly, is better than twelve tested inadequately.

If you'd like to see an example of our COA before ordering, email us at sales@aponiacbd.co.uk and we'll send you the current batch report.

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