Understanding Terpenes
What makes cannabis smell, taste, and feel different?
What Are Terpenes?
Terpenes. They're the aromatic compounds found in every cannabis flower — the same molecules that give lemons their citrus kick, lavender its calming scent, and black pepper its spice. Cannabis produces over 200 of them, and their unique combination in each cultivar is what shapes the experience.
Terpenes are volatile organic compounds produced in the trichomes of the cannabis plant — the same glands that produce cannabinoids like THC and CBD. They evolved as a defence mechanism against pests and environmental stress, but for patients, they're increasingly recognised as a key part of the therapeutic picture.
Research suggests terpenes may work alongside cannabinoids in what's sometimes called the "entourage effect" — though the science here is still emerging and the term is debated among researchers.
The Major Terpenes in Cannabis
Myrcene
Earthy, musky, herbalThe most common terpene in cannabis — detected in nearly 90% of samples in large-scale testing. Preclinical research associates it with relaxation and muscle-relaxant properties.
You already know this smell:
Limonene
Bright, citrusyThe same compound found in oranges and lemons. Detected in roughly 79% of cannabis samples tested. Preclinical studies associate it with anxiolytic (anxiety-reducing) effects.
You already know this smell:
Caryophyllene
Spicy, peppery, warmNotable because it interacts directly with CB2 receptors in the endocannabinoid system — making it the only terpene that also functions as a dietary cannabinoid. Studied for potential anti-inflammatory properties.
You already know this smell:
Terpinolene
Floral, herbal, pineyLess common as a dominant terpene but distinctive when present. Often associated with uplifting cultivar families in observational studies.
You already know this smell:
Pinene
Fresh, piney, sharpThe most abundant terpene in nature. Research suggests it acts as an acetylcholinesterase inhibitor, which may have implications for alertness.
You already know this smell:
Linalool
Floral, lavender, sweetThe signature compound of lavender. Preclinical studies associate it with calming effects — consistent with lavender’s history in traditional medicine.
You already know this smell:
Humulene
Earthy, woody, hoppyAn isomer of caryophyllene. Cannabis and hops are botanical cousins — both in the Cannabaceae family.
You already know this smell:
Ocimene
Sweet, herbal, woodyFrequently detected in certain cultivar families. Also abundant in mint, parsley, and orchids.
You already know this smell:
Important
The effects described above are based on preclinical research (laboratory and animal studies) and observational data. They are not therapeutic claims. Cannabis is a prescription medicine in the UK — discuss any treatment decisions with your prescribing clinician.
What about indica and sativa?
A 2022 study of nearly 90,000 samples found that common labels like "indica" and "sativa" were not reliable predictors of chemical composition — the same name from different producers often produced different profiles. These labels describe plant morphology (leaf shape, growth pattern), not terpene or cannabinoid content. We don't use them as predictors of effects.
How We Source Our Data
We believe in showing our working.
Aggregated laboratory data
Our primary source is Smith et al. (2022), published in PLOS ONE, containing 42,843 laboratory-tested samples across six US states. Each sample was analysed by accredited laboratories using gas chromatography.
Open-source data collections
We cross-reference with the Cannlytics open dataset, aggregating over 100,000 public cannabis lab results from state regulatory databases.
Academic literature
Peer-reviewed studies in Nature Plants, Plant Science, Cannabis and Cannabinoid Research, and other journals.
For each cultivar, we identify the dominant terpene — the compound most consistently reported as highest across available laboratory samples. We also identify major and minor terpenes to give a picture of the overall profile. We do not publish specific percentages because terpene concentrations vary significantly with growing conditions, and our source data may not reflect the specific conditions under which UK-prescribed products are cultivated.
Our Confidence System
Based on 20+ laboratory-tested samples. Statistically robust.
Based on 5–19 samples. Reasonable directional guide.
Based on 2–4 samples or academic literature. Treat as approximate.
Profile based on a parent cultivar. The actual product is a cross and will differ.
What This Data Isn't
- •Not a Certificate of Analysis for any specific batch
- •Not based on testing of UK-prescribed products
- •Not a guarantee of what any product contains
- •Not medical advice or a therapeutic recommendation
Known Limitations
No standardised naming — Same cultivar name does not mean same genetics across producers.
Geographic data gap — US lab data applied to internationally grown UK-prescribed products.
Parent cultivar inference — Crosses inherit from all parents, not just the one shown.
Declining terpene levels — Industry trend toward THC optimisation may reduce terpene content over time.
Batch variation — Normal and expected even from the same producer.
What We Present on CannaBias
In our unrelenting mission for transparency and an evidence-led healthcare industry, we believe patients deserve to know not just what they're prescribed, but why we present the information the way we do.
What we show
The dominant terpene for each product — the compound most consistently reported as highest across laboratory testing
Up to two major terpenes — the next most prominent in the profile
A confidence rating (HIGH / MEDIUM / LOW) so you can judge the data quality yourself
Household smell pairings — because terpene names mean nothing until you can relate them to something real
Sample counts — exactly how many lab tests back each profile
What we deliberately don't show
No percentages — our data comes from US laboratories testing US-grown cannabis. Showing "Myrcene: 0.43%" would imply a precision that doesn't apply to your specific UK-prescribed batch
No therapeutic claims — preclinical research is promising, but we won't tell you a terpene "treats" anything. That's a conversation for your clinician
Scope and honesty
We matched 265 flower products in our catalogue against 2,866 cultivars from 122,280 laboratory-tested samples. This reflects the products we were able to confidently match to public lab data — not a comprehensive survey of the UK market.
40 products remain unmatched because they're proprietary UK crosses with no public laboratory data. We'd rather show nothing than show something misleading.
References
- Smith et al. (2022). PLOS ONE, 17(5), e0267498. DOI
- Schwabe & McGlaughlin (2019). Journal of Cannabis Research, 1(1), 3. DOI
- Booth & Bohlmann (2019). Plant Science, 284, 67–72. DOI
- Fischedick (2017). Cannabis and Cannabinoid Research, 2(1), 34–47. DOI
- Sommano et al. (2020). Molecules, 25(24), 5792. DOI
- Vigil et al. (2023). J Cannabis Research, 5, 13. PMC
- Watts et al. (2021). Nature Plants, 7, 1330–1334. DOI
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