TL;DR: Every legal cannabis product in Massachusetts comes with a receipt for its quality, a lab report called a COA. Most people never look at it. Learning to read one in thirty seconds is the closest thing to a cheat code for buying better flower.
Every legal cannabis product in Massachusetts comes with a receipt for its quality, a lab report called a COA. Most people never look at it. Learning to read one in thirty seconds is the closest thing to a cheat code for buying better flower.
We're Gibby's Craft Cannabis, the craft brand from Gibby's Garden, and we think the COA is the most underused tool on the shelf. Here's how to use it.
What a COA actually is
COA stands for Certificate of Analysis. It's the report from an independent, state-licensed testing lab that every legal product has to pass before it can be sold. Think of it as the nutrition label plus the safety inspection, combined. In Massachusetts you can usually ask a budtender to see it, or find it tied to the batch number on the package.
It tells you four useful things. Here's how to weigh each.
1. Potency (don't over-rank it)
This is the THC and CBD percentage, the part everyone fixates on. THC is the main intoxicating cannabinoid; CBD is a non-intoxicating one. Here's the honest framing: potency tells you strength, not quality. A higher THC number does not mean better flower, and chasing the biggest number is the most common way people end up disappointed. Note it, then move on, the more interesting parts are below. (We made the full case for this in how to choose good flower.)
2. Terpenes (the good part)
Not every COA lists them, but when it does, this is the section worth reading. Terpenes are the aromatic compounds behind a strain's smell and flavor. A terpene breakdown tells you what the flower will actually smell and taste like, which is a far better predictor of whether you'll enjoy it than the THC number. If the COA lists terpenes, let that guide you.
3. The safety screens (the pass/fail that matters)
This is the part that's quietly the whole point. The COA shows whether the product passed screening for pesticides and microbials, that's contaminants like mold, yeast, and bacteria. In Massachusetts, a product can't be sold unless it passes these, so a legal product on a shelf has already cleared them. It's still worth knowing the screen exists, because it's why we grow the way we do: we pass microbial testing by keeping the grow clean from the start rather than relying on post-harvest irradiation.
4. The dates (freshness)
Look for a harvest or packaged date. Cannabis is a fresh product, terpenes fade with time and air, so a more recent date generally means a louder, better-tasting jar. If you have two similar options, the fresher one is usually the better buy.
The 30-second read
Next time you're at the counter: glance at potency and don't worship it, read the terpenes if they're listed, confirm the batch passed its safety screens, and check the date. That's it. You'll be buying like someone who knows what they're doing, because you will be. And when you want to put it into practice, ask for Gibby's Craft Cannabis by name and ask to see the COA.
Frequently Asked Questions
What is a COA for cannabis?
A COA, or Certificate of Analysis, is the independent lab report showing a cannabis product's test results, potency, often terpenes, and pesticide and microbial safety screening. Every legal Massachusetts product must pass testing and have a COA before it can be sold.
How do I get the COA for my cannabis?
Ask your budtender to show you the COA, or look for the batch or lot number on the package, which ties to its lab results. Many producers and dispensaries can pull it up on request.
What should I look at first on a COA?
Read the terpene profile and the safety screens before the THC number. Terpenes predict smell and flavor, the safety results confirm the product passed contaminant testing, and potency tells you strength but not quality.
Does a COA mean cannabis is safe?
A COA confirms the product passed Massachusetts's required pesticide and microbial screening, which is a safety standard every legal product must meet. As with any cannabis product, consume responsibly and follow the warnings on the package.
There may be health risks associated with consumption of this product. For use only by adults 21 years of age or older. Keep out of the reach of children.
This product has not been analyzed or approved by the Food and Drug Administration (FDA). There is limited information on the side effects of using this product, and there may be associated health risks. Marijuana use during pregnancy and breast-feeding may pose potential harms. It is against the law to drive or operate machinery when under the influence of this product. KEEP THIS PRODUCT AWAY FROM CHILDREN. There may be health risks associated with consumption of this product. Marijuana can impair concentration, coordination, and judgment. The impairment effects of Edibles may be delayed by two hours or more. In case of accidental ingestion, contact poison control hotline 1-800-222-1222 or 9-1-1. This product may be illegal outside of MA.
Gibby's Garden is a licensed Massachusetts cannabis microbusiness (License MB281347). Products available exclusively through licensed dispensary partners.
