Why the COA is the only honest label
Product names are marketing. Strain names are not standardised. The certificate of analysis is the one document that describes what is actually in the batch in front of you.
A COA is batch-specific. A COA for a different batch of the same product tells you very little.
Total THC, and why delta-9 alone misleads
Fresh cannabis contains mostly THCA, the non-intoxicating acid form. Heat converts it to THC. A COA usually lists both, plus a calculated total.
The standard calculation is total THC = delta-9 THC + (0.877 x THCA). The 0.877 factor accounts for mass lost when the carboxyl group leaves during decarboxylation.
Compare products on total THC. Comparing delta-9 figures alone will systematically mislead you about flower potency.
The four checks
Read these in order and you have most of what a COA can tell you.
- • Total THC and total CBD — the potency and the ratio
- • The top three terpenes by percentage — the most reproducible identifier of a product you liked
- • Pesticides, heavy metals, residual solvents, and microbials — all should read "pass"
- • The test date — old results on a fresh-looking product are a question worth asking
If there is no COA
Licensed retailers can produce one. If a seller cannot, you do not know what you are buying — and unlicensed vape cartridges in particular have a documented safety history worth avoiding.