Pick up any product from a licensed Alberta cannabis store and you'll notice the package looks nothing like other consumer goods: plain colours, a red octagon, a yellow warning box, a small stamp, and a wall of numbers. None of it is decoration. Every element on a legal Canadian cannabis label is required by the federal Cannabis Regulations, and once you know how to read it, the label tells you exactly what's in the package, how potent it is, who made it, when it was packaged, and whether the product is legal at all. Here's how to decode each part — and how the same details expose an illicit product in about thirty seconds.
What's on every legal cannabis label in Canada
Health Canada requires the same core elements on every cannabis product sold in the country, whether it's dried flower, a vape cartridge, or a chocolate. According to Health Canada's guide on how to read and understand a cannabis product label, a compliant label must include:
- The standardized cannabis symbol (the red octagon) on intoxicating products
- A federal excise stamp in your province's colour
- THC and CBD content, shown as both the amount in the package and the "Total" amount it can yield
- A health warning message in a yellow box
- The class of cannabis (dried cannabis, edible cannabis, cannabis extract, or cannabis topical)
- Net weight and number of units
- Lot number and packaging date
- The licence holder's name and contact information
- The bilingual warning "KEEP OUT OF REACH OF CHILDREN / TENIR HORS DE LA PORTÉE DES ENFANTS"
Everything is in both English and French. If any of those pieces is missing, you are not looking at a legal Canadian product. The sections below take each one in turn.
The standardized cannabis symbol: the red octagon
The standardized cannabis symbol is a red octagon — the same shape as a stop sign — containing a white cannabis leaf and the letters "THC." Under Health Canada's packaging and labelling guide for cannabis products, the symbol must appear in the upper-left 25% of the label's main panel, measure at least 1.27 cm by 1.27 cm, keep a white border on all sides, and use one exact shade of red (Pantone 185). Producers can't shrink it, recolour it, or tuck it on the back.
The symbol is required on any cannabis product containing more than 10 micrograms of THC per gram — in practice, virtually everything intoxicating on a store shelf. One nuance worth knowing: a product can fall under that 10 µg/g concentration threshold and still contain a meaningful total amount of THC. A standard-size cannabis beverage, for example, might be below 10 µg/g by concentration but still deliver 2.5 mg of Total THC. The symbol is a fast visual cue, but the THC numbers (covered below) are what tell you the actual amount.
The excise stamp: proof the product is legal and duty-paid
The excise stamp is the small federal seal — 20 mm by 40 mm — affixed across the package opening. The Canada Revenue Agency's consumer guide to excise stamps explains what to look for: the words "Duty Paid Canada," a unique 9-character identifier (3 or 4 capital letters followed by 5 or 6 numbers) on the right side, and built-in security features including colour-shift ink that changes from green to red as you tilt the stamp.
Each province and territory uses its own stamp colour — 13 variations in total — with the jurisdiction's initials printed on the coloured band. Products sold in Alberta carry the "AB" stamp; a product stamped for Ontario or B.C. isn't authorized for sale here. The stamp confirms two things at once: federal excise duty was paid, and the product came from a Health Canada licence holder.
The CRA's guidance is blunt: if you don't see an excise stamp, don't buy or use the product — it's contraband. The only legitimate exceptions are certain low-THC products (under 10 µg/g) and prescription cannabis, which don't require stamps.
Total THC vs THC: decarboxylation, explained simply
This is the part of the label that confuses the most people. Many products show two THC lines — "THC" and "Total THC" — with very different numbers. Both are correct. Here's why.
In raw cannabis flower, most of the THC doesn't exist as THC yet. It exists as THCA (tetrahydrocannabinolic acid), a non-intoxicating precursor molecule. Heat converts THCA into THC — that chemical reaction is called decarboxylation, and it happens when cannabis is smoked, vaporized, or cooked during manufacturing. So:
- THC = the amount of active THC in the product exactly as it sits in the package
- Total THC = the amount of THC the product *could yield* once heat fully converts the THCA — Health Canada's labelling rules define it as the quantity "taking into account the potential to convert THCA into THC"
Because the THCA molecule loses a little mass as it converts, labs don't simply add the two numbers — the standard calculation is Total THC = THC + (THCA × 0.877).
Which number should you read? For dried flower and pre-rolls, Total THC is the meaningful figure, since the product is heated when used. That's why dried flower often shows a tiny "THC" value (the flower hasn't been heated yet) next to a much larger "Total THC" value. For edibles, beverages, and most extracts, the conversion already happened during processing, so the two numbers are usually identical or nearly so.
mg/g vs %: how to convert the numbers
Canadian labels express potency for flower and extracts in milligrams per gram (mg/g) rather than the percentage you'll hear in conversation. The conversion is simple: divide mg/g by 10 to get the percentage. So:
- 180 mg/g Total THC = 18% THC
- 250 mg/g Total THC = 25% THC
- 320 mg/g Total THC = 32% THC
To find the total amount in a package, multiply the concentration by the net weight. Health Canada's own example: a 30-gram package of dried cannabis labelled "Total THC 180 mg/g" contains 5,400 mg of THC in total (180 × 30). For a deeper dive on what those potency figures do and don't tell you, see our guide to understanding THC percentages.
Edibles: per-unit milligrams and the 10 mg package cap
Edibles are labelled differently because you consume them in discrete pieces. The label shows "Total THC per unit" — the milligrams in each piece — alongside the package total. A package of four gummies labelled "Total THC per unit 2.5 mg" contains 10 mg of THC in total.
That 10 mg figure isn't a coincidence. The Cannabis Regulations cap edible cannabis at 10 mg of THC per package, and cannabis extracts intended for ingestion (capsules, oils) at 10 mg of THC per unit. Any "gummy" claiming 100 mg, 500 mg, or 1,000 mg per package is by definition not a legal Canadian product. Beverages and oral sprays follow related rules — a metered spray, for instance, must state the THC dispensed per activation. If you're new to reading edible labels, our edibles dosing guide walks through the per-unit math in detail.
Packaged-on date, lot number, and expiry date
Three small lines on the label do a lot of work:
- Packaging date: the date the product was sealed into its container. The regulations require it to be accurate within seven days. For dried flower, this tells you how long the product has been sitting since packaging — useful information, since flower loses moisture over time.
- Lot number: the production batch identifier. This is the number Health Canada and producers use to trace a product for recalls, and the number you should quote if you contact a producer or report a quality issue to Health Canada.
- Expiry date: here's the counterintuitive part — an expiry date is not required, and most products don't have one. Under the packaging rules, a producer may only print an expiry date if they've validated a stability period for the product through testing. So "no expiry date" doesn't mean the product lasts forever; it means the producer hasn't established a formal stability period. When an expiry date does appear, it must show at least the month and year.
Child-resistant containers and plain packaging
Every cannabis product (except plants and seeds) must come in a child-resistant container — that's why the lids, pouches, and push-tabs take a deliberate squeeze-and-turn to open. The container itself follows strict plain-packaging rules: one uniform colour, no fluorescent or metallic finishes, and the colour must contrast with the yellow warning box and the red symbol so neither can be camouflaged. Branding is limited to the brand name plus one small logo no larger than the cannabis symbol itself. If a package looks loud, glossy, cartoonish, or styled to mimic candy or snack branding, it didn't come from a licensed producer.
Health warnings: why the yellow box changes between packages
Every label carries a health warning message in a yellow box on the front panel. The text isn't written by the producer — it comes from a fixed list of messages written by Health Canada, and the regulations require producers to rotate the warnings so each message appears on roughly equal numbers of packages of a given product each year. That's why two packages of the identical product can display different warnings — it's a compliance requirement, not a printing error. Health Canada updated its list of warning messages in early 2025 based on current scientific evidence, and producers have 12 months to roll label changes through after any update.
The licence holder: who actually made your product
The brand name on the front and the company behind it are often different. The label must show the name, phone number, and email address of the Health Canada licence holder that packaged the product — the legally accountable party. Many popular brands are produced under licence by a parent company whose name appears only in this fine print. If you ever have a complaint or quality concern, this contact information plus the lot number and packaging date is exactly what the producer (or Health Canada) will ask for.
Legal vs illicit: the 30-second label check
Put it all together and a legal product is easy to verify. Check for:
- Excise stamp with "Duty Paid Canada," a 9-character code, and Alberta's "AB" band — colour-shift ink that moves green-to-red when tilted
- Red octagon THC symbol in the top-left of the main panel
- Yellow health warning box with bilingual English/French text
- Plain, single-colour packaging with minimal branding
- Licence holder name and contact info, lot number, and packaging date
- Plausible numbers: dried flower above roughly 35% Total THC is essentially unheard of in licensed production, and edibles are capped at 10 mg THC per package
Illicit packaging fails several of these at once: no stamp, no French, cartoon graphics imitating candy brands, and impossible potency claims like "54% THC" flower or "600 mg" gummies. The Cannabis Act also requires that legal products only be sold through authorized retailers — in Alberta, you can verify any store through the AGLC cannabis licensee search. Every product on the shelf at our nine AGLC-licensed Bud Mart locations carries the AB excise stamp and full federal labelling, whether you shop in store or order same-day weed delivery in Calgary, Airdrie, Chestermere, or Didsbury.
FAQ: reading Canadian cannabis labels
What does the red octagon symbol on cannabis packaging mean?
The red octagon containing a cannabis leaf and the letters "THC" is Canada's standardized cannabis symbol. It's required by Health Canada on any cannabis product containing more than 10 micrograms of THC per gram, must appear in the upper-left area of the label's main panel, and must be at least 1.27 cm square. It exists to warn at a glance that the product contains THC, the main intoxicating cannabinoid in cannabis.
What is the cannabis excise stamp and what does Alberta's look like?
The excise stamp is a 20 × 40 mm federal seal confirming excise duty was paid and the product came from a Health Canada licence holder. It reads "Duty Paid Canada," carries a unique 9-character identifier, and uses colour-shift ink that changes green to red when tilted. Each of the 13 provinces and territories has its own stamp colour with the jurisdiction's initials on the band — products legal for sale in Alberta carry the "AB" stamp. No stamp means the product is contraband.
What's the difference between THC and Total THC on a label?
"THC" is the active THC in the product as packaged. "Total THC" is the amount the product can yield after heat converts THCA — the non-intoxicating precursor found in raw cannabis — into THC, a reaction called decarboxylation. For dried flower and pre-rolls, Total THC is the meaningful number because the product is heated when used; for edibles and most extracts, conversion already happened during manufacturing, so the two figures are usually the same.
How do I convert mg/g into a THC percentage?
Divide the mg/g figure by 10. A dried flower label showing "Total THC 200 mg/g" is 20% THC; 280 mg/g is 28%. To get the total milligrams in the package, multiply the mg/g figure by the net weight in grams — a 3.5 g package at 200 mg/g contains 700 mg of Total THC.
Why are legal edibles in Canada limited to 10 mg of THC?
The federal Cannabis Regulations cap edible cannabis at 10 mg of THC per package, and ingestible extracts such as capsules at 10 mg per unit. Labels state "Total THC per unit" so you can see the milligrams in each piece. Any package claiming hundreds of milligrams of THC in a single edible is not a legal Canadian product.
Do cannabis products have an expiry date?
Usually not, and that's by design. Producers may only print an expiry date if they have validated a stability period for the product through testing, so most legal products show a packaging date and lot number instead. "No expiry date" means no stability period has been established — not that the product lasts indefinitely.
Why do two packages of the same product have different warning labels?
Health Canada writes a fixed list of health warning messages, and the regulations require producers to rotate them so each message appears on roughly equal numbers of packages of each product every year. Different warnings on identical products are a compliance requirement, not an error.
How can I tell if a cannabis product is legal or illicit?
Check five things: a provincial excise stamp (with "AB" in Alberta), the red octagon THC symbol, a yellow bilingual health warning, plain single-colour packaging with a licence holder's name and contact details, and realistic potency numbers. Illicit products typically miss several at once — no stamp, no French text, candy-style graphics, or impossible claims like 50%+ THC flower. You can confirm any Alberta retailer is licensed through the AGLC's cannabis licensee search.
Information only. This content is for informational purposes and does not constitute medical advice. Cannabis products are for adults 18+ with valid ID. Consult a healthcare professional for medical questions.