How to read a COA (Certificate of Analysis)
A Certificate of Analysis is a lab report. It tells you exactly what's in the product you're about to buy, and what isn't. Every batch we sell at Herban Bud ships with one, tested by a third-party lab. That means a lab that doesn't work for us, doesn't answer to us, and has no reason to make our numbers look good.
Here's our honest take: skip any seller that doesn't post COAs. It's not a luxury or a nice-to-have. It's the floor. If a company won't show you the lab results, you have no idea what you're smoking, dabbing, or eating. You're just trusting the label, and a label can say anything.
Once you know how to read a COA, you'll never buy hemp the same way again. So let's walk through it, section by section, in plain English.
The cannabinoid panel
This is the part most people skip to, and for good reason. The cannabinoid panel lists every compound the lab found and how much of each. You'll see THCa as a percentage, delta-9 THC, CBD, and usually a handful of minor cannabinoids like CBG or CBN.
For THCa flower, the THCa number is the one buyers care about most. A strong batch usually lands somewhere in the high teens to mid-twenties by percent. The numbers are measured by weight, so you're seeing the real potency of that specific harvest, not a guess and not a marketing claim.
One thing worth knowing: the panel often shows both the raw cannabinoid percentages and a "total THC" calculation. Total THC accounts for how THCa converts to THC when you heat it. Don't let the math trip you up. The lab spells out each value separately so you can see exactly what's there.
The delta-9 compliance line
This is the line that keeps the product legal as hemp. Under the 2018 Farm Bill, hemp has to test at or below 0.3% delta-9 THC by dry weight. The COA shows that delta-9 number plainly, and on every batch we sell, it sits under that limit.
So when you check a COA, find the delta-9 percentage and confirm it reads 0.3% or less. That single number is the difference between compliant hemp and something it's not. We test for it on every lot because it matters, and because you deserve to verify it yourself instead of taking our word.
Worth saying clearly: compliant under federal law doesn't mean legal in all fifty states. Hemp laws vary, and a few states restrict or ban these products. Check your own state's rules before you order.
The safety screens
Potency tells you what you're getting. The safety screens tell you what you're avoiding. This is the part a lot of buyers don't even know to look for, and it might be the most important section on the page.
A full COA screens for contaminants that have no business being in something you put in your body:
- Pesticides — chemicals that can end up on a plant during growing.
- Heavy metals — things like lead, arsenic, cadmium, and mercury, which plants can pull up from soil.
- Residual solvents — leftover chemicals from the extraction process, mostly relevant for concentrates.
- Microbials — mold, yeast, and harmful bacteria.
For each one, the lab reports a result and whether the batch passed. You want to see "pass" across the board. We do. Clean flower and clean concentrates aren't an upsell. They're the standard, and the COA is how we prove it.
The lot number and date
Here's the section that ties it all together. Every COA is tied to a specific lot or batch, and that lot number is printed on your package. The date tells you when the testing happened.
To verify what you bought, match the lot number on your package to the matching COA. That's the whole trick. A general "we test our stuff" page is fine, but matching a real lot number to a real report is how you confirm that the exact product in your hand is the one that got tested. No matching number, no real proof.
See it for yourself
You don't have to take any of this on faith. We post every COA on our COA Reports page. Pull up the report, find your lot number, and read it the way we just walked through. Potency, delta-9, safety screens, lot and date.
This is the standard we hold every batch to, and it's why more than 10,000 orders have come through with a 4.5-star rating across 1,010-plus reviews. People come back when they can trust what's on the label, and the COA is how we earn that.
Ready to put it to use? Browse our flower collection, or if you're still getting your bearings, start with our complete guide to THCa flower. Either way, you'll know exactly what you're buying and how to prove it.
These statements have not been evaluated by the FDA. THCa products are not intended to diagnose, treat, cure, or prevent any disease. 21+ only. Hemp-derived and compliant with the 2018 Farm Bill — laws vary by state, so please check your state's laws before ordering.