Myrcene: Occurrence, Measurement, Research and Limits
Myrcene is a common aroma compound in cannabis and hops. This page explains what it is, how labs measure it, what animal and human research shows, and its safety limits.
Content last updated . This page has not been medically reviewed.
What myrcene is
Myrcene, often written beta-myrcene, is a monoterpene: a small, aromatic plant molecule built from ten carbon atoms. [1] PubChem gives its formula as C10H16 and its systematic name as 7-methyl-3-methylideneocta-1,6-diene. [2] It is a major constituent of many plants, including hops and cannabis, and it is used as a flavoring and aroma agent in food and beverages. [1] This page is information only. It does not tell anyone to use, avoid or seek out myrcene.Evidence labels used here: preclinical (cells/animals only) means no human result; promising but limited means a few small human studies; insufficient evidence means too little to conclude; marketing claim means a statement not backed by the sources read.
Where it occurs in cannabis
Cannabis makes terpenes in the resin glands (glandular trichomes) of the female flower. [3] In a study of one hemp variety, β-myrcene was among the major compounds produced by the plant's terpene-making enzymes. [3] A 2025 mouse study describes myrcene as one of the most abundant terpenes found in cannabis. [4]How much myrcene a given product holds is not predictable from its name. Reviewers note concern about inconsistent terpene and cannabinoid composition between cannabis "strains". [5] Even ten plants of one strain grown under controlled conditions and harvested together varied by about 20 percent in the terpenes measured. [6] Studies also disagree between groups: one study of 21 varieties reported more β-myrcene in CBD-dominant than in THC-dominant ones, [7] while another of 33 samples listed it among the main terpenes in both groups. [8] No typical percentage can be given here; composition varies and only batch-specific laboratory data can show it.
How it is measured
Laboratories measure terpenes by gas chromatography with flame ionization or mass spectrometry detectors. One published method quantified 20 terpenes this way, [6] another quantified 42, [9] and another used a headspace method with a stated detection limit of 5 ppm. [8] See Terpene Testing: How Profiles Are Measured and Reported and How to Read a Cannabis Certificate of Analysis.Processing changes the picture. When six cannabis varieties were compared as flower and as a supercritical CO2 extract, monoterpenes were lost in the extraction process, so the extract had a different terpene fingerprint from the flower. [9] Myrcene is a monoterpene, [1] so a concentrate's myrcene share cannot be assumed to match its source flower.
What research shows
| Question | What was found | Evidence label |
|---|---|---|
| Pain-related behavior | In a mouse model of neuropathic pain, myrcene raised pain thresholds. A CB1 blocker reduced the effect, yet myrcene did not directly activate CB1 receptors in cell tests, and some female mice showed place aversion to it. [4] | Preclinical (cells/animals only) |
| TRPV1 pain channel | In cell experiments myrcene triggered TRPV1 channel activity and dominated the response to a terpene mixture. [10] | Preclinical (cells/animals only) |
| Overall health benefits | A review reports promising findings in many animal studies, and notes that human studies are lacking. [1] | Insufficient evidence in people |
| Sleep, as part of a mixture | In 125 adults with insomnia, an oral CBD-plus-eight-terpene product (myrcene was one) slightly increased time in slow-wave plus REM sleep as measured by a wrist device. [11] | Promising but limited; cannot be credited to myrcene alone |
| Human effects of myrcene alone | Proper evidence not found. Reviews and a PubMed search for this page turned up no human trial testing myrcene alone. | Insufficient evidence |
The "entourage effect" idea, that terpenes and cannabinoids work better together, is described by a leading review as something that would matter "if proven". [12] See The Entourage Effect. Claims that myrcene alone makes a product sedating are a marketing claim: a study of 140 medicinal cannabis flowers found terpene profiles unrelated to indica, sativa or hybrid labels and to estimated effects. [13]
Safety and limits
- Food use. Myrcene is a popular food flavoring. [1]
- Animal toxicology. The US National Toxicology Program gave β-myrcene by stomach tube to rats and mice for up to two years. It found clear evidence of carcinogenic activity in male rats (kidney tubule tumors) and in male mice (liver tumors). [14] The program chose it partly because it is used widely in cosmetics, soaps, detergents and food flavoring. [14] The abstract does not say how these animal results apply to people who use cannabis, so none is claimed here.
- Heated inhalation. In a laboratory test, adding terpenes to THC raised the levels of gas-phase breakdown products from vaping and dabbing compared with THC alone. [15] That test covered terpenes in general, not myrcene alone. See Smoking and Vaping Cannabis: Respiratory and Other Risks.
- Special groups. Pregnancy, children, older adults, and people with liver, heart or mental health conditions: Proper evidence not found for myrcene itself. See Cannabis and CBD in Pregnancy and Breastfeeding.
If a child or pet swallows a cannabis product, call US Poison Help at 1-800-222-1222, or 911 for an emergency. See Accidental Child and Pet Exposure.
Quality and labeling
A laboratory paper on terpene profiling noted the method could help spot artificial adulteration, giving an added flavor ester as an example. [8] A myrcene figure on a label is one batch result, not a promise about the next. See Added Terpenes vs Naturally Occurring Terpene Profiles and Terpenes in Cannabis.Frequently asked questions
Does myrcene make cannabis sedating?
No human trial testing myrcene alone was found. A review says human studies are lacking, [1] and terpene profiles did not line up with indica or sativa labels in 140 flowers. [13] See Why Indica and Sativa Labels Do Not Reliably Predict Individual Effects.
Is myrcene only found in cannabis?
No. It is also a major constituent of hops and many other plants. [1]
Is myrcene safe?
It is used as a food flavoring. [1] In long rodent studies by stomach tube it caused kidney and liver tumors in males. [14] Safety of inhaled or concentrated myrcene in people is not established by the sources read. Talk with a doctor or pharmacist about any health concern.
Does a higher myrcene number on a lab report mean stronger effects?
No source read supports that. Terpene profiles did not match estimated effects in a 140-flower study, [13] and results vary by batch and method. [6]