A Certificate of Analysis (COA) is the single most important document in cannabis. It's the only way to verify that what a brand claims about their product - potency, purity, safety - is actually true. If you can read a COA, you can separate the legitimate brands from the ones cutting corners.
Secret Nature publishes full-panel COAs for every batch we produce, tested by independent third-party laboratories. This guide will teach you exactly what to look for, what the numbers mean, and the red flags that should make you walk away.
What Is a COA (Certificate of Analysis)?
A COA is a lab report produced by an independent, accredited testing laboratory. It documents the chemical composition of a cannabis product and screens for harmful contaminants. A proper COA includes:
- Cannabinoid potency profile - THCA, delta-9 THC, CBD, CBG, CBN, and other cannabinoids
- Terpene analysis - the aromatic compounds that drive flavor and effects
- Pesticide screening - tests for hundreds of potential pesticide residues
- Heavy metals testing - screens for lead, arsenic, mercury, and cadmium
- Microbial testing - checks for mold, yeast, E. coli, salmonella, and other pathogens
- Residual solvent testing - ensures no leftover processing chemicals (especially important for extracts and vapes)
- Moisture content - affects shelf life and combustion quality
View Secret Nature's complete lab results →
How to Read the Cannabinoid Potency Section
The potency section is what most people look at first. Here's what each number means:
THCA Percentage
This is the main number for THCA flower. Premium flower typically tests between 20-30% THCA. This is the compound that converts to psychoactive THC when heated. Higher isn't always better - a well-grown 22% flower with rich terpenes can deliver a better experience than a 30% flower with a flat terpene profile.
Delta-9 THC Percentage
For legal compliance, this must be below 0.3% by dry weight. If a COA shows delta-9 THC above 0.3%, the product is technically marijuana, not hemp, and shouldn't be sold online. This is the number that determines Farm Bill compliance.
Total THC
This is calculated using the formula: Total THC = (THCA × 0.877) + delta-9 THC. The 0.877 factor accounts for the weight lost when THCA converts to THC through decarboxylation. This number gives you a realistic estimate of the psychoactive potency you'll experience when smoking.
CBD, CBG, CBN, and Minor Cannabinoids
These secondary cannabinoids contribute to the entourage effect. CBD can moderate THC's intensity, CBG may add focus and clarity, and CBN is associated with sedation. A diverse cannabinoid profile generally indicates higher-quality, more complex flower.
How to Read the Terpene Analysis
Terpenes are the aromatic compounds that give each strain its unique flavor, aroma, and effects. A terpene analysis breaks down the individual terpenes and their concentrations. Key terpenes to look for:
- Myrcene - earthy, musky; associated with relaxation and sedation (most common in indica-leaning strains)
- Limonene - citrus; associated with mood elevation and stress relief
- Caryophyllene - peppery, spicy; the only terpene that binds to CB2 receptors; anti-inflammatory properties
- Linalool - floral, lavender; associated with calming and anxiety relief
- Pinene - pine; associated with alertness and mental clarity
- Terpinolene - herbal, floral; found in uplifting, creative strains
- Humulene - hoppy, earthy; potential appetite suppressant
- Ocimene - sweet, herbaceous; found in energizing strains
Total terpene content above 2% is considered good. Above 3% is excellent. Flower with less than 1% total terpenes was likely quick-dried, poorly cured, or stored improperly.
The Safety Panels: What "Pass" and "Fail" Mean
Pesticide Testing
Labs screen for hundreds of pesticides, fungicides, and growth regulators. Results should show "ND" (Not Detected) or "Pass" for every compound tested. Any detections above action levels mean the product failed and should not be consumed. Cannabis is a bioaccumulator - pesticide residues concentrate in the flower and are inhaled directly when smoked.
Heavy Metals
Tests for lead, arsenic, mercury, and cadmium. These can enter the plant through contaminated soil, water, or fertilizers. Results should show levels well below established action limits. Even trace amounts are concerning with a product you're combusting and inhaling.
Microbial Testing
Screens for mold, yeast, E. coli, salmonella, and aspergillus. Cannabis stored in humid conditions or improperly cured can develop mold that isn't visible to the naked eye. This test is especially important for immunocompromised users. Results should show "Pass" across all categories.
Residual Solvents
Primarily relevant for extracts, vapes, and concentrates. Tests for chemicals like butane, propane, ethanol, and hexane used in extraction processes. Flower should show clean results here as well, confirming no chemical treatments were applied.
Red Flags: When to Walk Away
Here are the warning signs that should make you question a brand's credibility:
- No COA available: If a brand doesn't publish lab results, assume the worst
- Potency-only testing: A COA that only shows cannabinoids without pesticides, heavy metals, and microbials is incomplete and potentially hiding problems
- No lab name or accreditation: The testing lab should be named, and ideally ISO 17025 accredited. If you can't identify or verify the lab, the COA may be fabricated
- No batch number: A legitimate COA references a specific batch or lot number. Generic COAs without batch info may be reused across multiple batches
- Outdated dates: COAs should be from the current batch - within the last 6-12 months. A COA from 2 years ago doesn't represent what you're buying today
- Delta-9 THC above 0.3%: The product doesn't meet Farm Bill requirements and is being sold illegally
- Suspiciously high potency: Flower testing above 35% total cannabinoids should be viewed skeptically - these numbers are rare and sometimes result from "lab shopping" (sending samples to labs known for inflated results)
- No terpene data: While not legally required, the absence of terpene testing suggests the brand isn't investing in comprehensive quality assessment
How Secret Nature's COAs Compare
Every Secret Nature product includes a full-panel COA with:
- ✅ Complete cannabinoid profile (THCA, delta-9 THC, CBD, CBG, CBN, and more)
- ✅ Full terpene analysis with individual terpene percentages
- ✅ Pesticide screening (full panel, not abbreviated)
- ✅ Heavy metals testing (lead, arsenic, mercury, cadmium)
- ✅ Microbial testing (mold, yeast, E. coli, salmonella)
- ✅ Residual solvent screening
- ✅ Batch-specific with lot numbers matching product packaging
- ✅ Tested by accredited, independent laboratories
- ✅ Publicly available on our lab results page
We believe transparency isn't optional - it's the bare minimum. If a brand won't show you exactly what's in their product, they have something to hide.
Frequently Asked Questions
What does "ND" mean on a cannabis lab report?
ND stands for "Not Detected," meaning the substance was tested for but not found at or above the lab's detection limit. On pesticide and heavy metal panels, ND is the result you want to see - it means the contaminant was not present in measurable quantities.
How do I find a product's COA?
Reputable brands publish COAs on their website, usually on a dedicated lab results page or linked from individual product pages. Some brands also include QR codes on packaging that link directly to the COA. If you can't find a COA on the brand's website, contact them directly. If they won't provide one, don't buy the product.
What's the difference between a full-panel and potency-only COA?
A potency-only COA shows only cannabinoid percentages - how much THCA, THC, CBD, etc. is present. A full-panel COA includes potency plus safety testing: pesticides, heavy metals, microbials, residual solvents, and often terpenes. Potency-only testing is cheaper but tells you nothing about product safety. Always look for full-panel testing.
Can COAs be faked?
Unfortunately, yes. Some unscrupulous brands have been caught fabricating or altering lab reports. To verify authenticity: check that the lab exists and is accredited, look for a verification URL or QR code on the COA that links to the lab's database, confirm the batch number matches your product, and verify the testing date is recent.
How often should cannabis products be tested?
Every production batch should be individually tested. A COA from one batch does not guarantee the quality of a different batch. Reputable brands test each batch and update their COAs accordingly. If a brand only has one COA for all their products, or if the COA is more than a year old, that's a red flag.
What THCA percentage should I look for?
Premium THCA flower typically tests between 20-30%. However, potency isn't everything. A 22% flower with a rich terpene profile (above 2% total terpenes) can deliver a better, more nuanced experience than a 30% flower with minimal terpenes. Look at the full picture: cannabinoid diversity, terpene content, and clean safety panels.
