Myrcene is one of the most common terpenes in nature, a fragrant compound found in hops, cannabis, lemongrass, and many other plants. It has an earthy, slightly fruity scent and is responsible for much of the aroma in beer and certain cannabis strains. Beyond its role as a flavoring and fragrance agent, myrcene has drawn attention for potential anti-inflammatory, pain-relieving, and sedative properties, though most of this evidence comes from animal and lab studies rather than human trials.
Where Myrcene Is Found
Myrcene shows up across a wide range of plants, but hops are by far the richest source. It can make up as much as 70% of hop essential oil by volume, with concentrations reaching 10 grams per kilogram of dry weight. That’s a big reason why beer, especially hop-forward styles like IPAs, carries that distinctive herbal, resinous aroma.
Cannabis is the other plant most associated with myrcene. Different cannabis varieties contain varying amounts: strains balanced between THC and CBD tend to have the highest myrcene levels (roughly 0.87 to 1.32 mg/g), while THC-dominant strains can have as little as 0.19 mg/g. Lemongrass, verbena, bay leaves, and citrus fruits are also significant sources. If you’ve ever used lemongrass in cooking or tea, you’ve encountered myrcene in meaningful quantities.
What Myrcene Is, Chemically
Myrcene (technically beta-myrcene) is classified as an acyclic monoterpene, meaning it’s a small, open-chain molecule built from two isoprene units. Its molecular formula is C₁₀H₁₆, with a molecular weight of about 136. It boils at around 167°C (333°F), which means it vaporizes easily when plant material is heated. This volatility is what makes it so prominent in aromas: it lifts off readily into the air.
Sedative and Sleep-Related Effects
The folk reputation of myrcene as a relaxing, sleep-promoting compound has some laboratory support. In a study on mice with chemically induced insomnia, myrcene increased levels of two key calming brain chemicals: GABA (the brain’s main inhibitory signal) and serotonin. At the same time, it decreased levels of glutamate, the brain’s primary excitatory signal. The net effect was a shift toward sedation.
The mechanism appears to work through serotonin-related signaling pathways. Serotonin binds to receptors on brain cells and triggers a chain reaction that ultimately boosts GABA activity, promoting sleep. Myrcene increased the expression of several proteins involved in this chain, including the same receptor targets affected by diazepam (a well-known sedative). These effects were measurable after both a single dose and seven consecutive days of treatment in the mouse model.
That said, these are animal findings at controlled doses. Whether eating myrcene-rich foods or inhaling terpene-rich cannabis produces the same neurochemical shifts in humans hasn’t been established with the same precision.
Anti-Inflammatory and Pain-Relieving Properties
Myrcene’s potential as an anti-inflammatory agent has been tested in several preclinical settings. Essential oils rich in myrcene reduced the production of inflammatory signaling molecules and an enzyme called COX-2 (the same enzyme targeted by ibuprofen and similar drugs) within eight hours in a rat model of joint inflammation. Myrcene also inhibited the release of prostaglandins, which are compounds your body produces at injury sites that amplify pain and swelling.
In lab work using human cartilage cells from arthritic joints, pure myrcene reduced a key source of oxidative stress and interrupted one of the major inflammatory signaling cascades that drives joint damage. It also reduced thermal hyperalgesia, which is the heightened sensitivity to heat that occurs during inflammation. These results suggest myrcene acts on multiple parts of the inflammatory process rather than a single target, though the effects were local. When injected around an arthritic joint in rats, it reduced inflammation at the site but didn’t change inflammatory markers circulating in the bloodstream.
Myrcene in Cannabis: The Entourage Effect
Myrcene is frequently mentioned in cannabis discussions because of the “entourage effect,” the idea that terpenes and cannabinoids work together to shape the overall experience of a cannabis strain. Myrcene-dominant strains are often described as producing more sedating, “couch-lock” effects compared to strains dominated by other terpenes like limonene or pinene.
A popular claim holds that eating mangoes before using cannabis intensifies its effects because mangoes contain myrcene. While mangoes do contain some myrcene, no peer-reviewed study has tested or confirmed this specific claim. The amounts of myrcene in a typical mango are also far lower than what’s found in hops or concentrated cannabis extracts, making a meaningful pharmacological interaction unlikely based on what we currently know.
Uses in Food and Fragrance
Industrially, myrcene is valued as both a flavoring ingredient and a chemical building block. Its pleasant, slightly sweet and herbaceous scent makes it useful in perfumes and household fragrances. In the food industry, it contributes to the flavor profiles of beer, fruit juices, and various processed foods.
Myrcene also serves as a starting material for synthesizing other fragrance and flavor compounds. Its reactive chemical structure makes it relatively easy to convert into other terpenes used in the fragrance industry.
Safety and Regulatory Status
Myrcene’s regulatory story has a notable wrinkle. In 2018, the FDA removed synthetic myrcene from its approved food additives list. The reason wasn’t that typical dietary exposure poses a health risk. Rather, the removal was required under the Delaney Clause, a 1958 law that bars approval of any food additive shown to cause cancer in animals at any dose, regardless of how high that dose is.
The FDA was explicit that its own risk assessment found no public health concern at the levels people actually encounter in food. Synthetic myrcene was typically used in very small amounts, resulting in very low exposure. The agency stated plainly that it considers these substances “otherwise safe” and that the removal was purely a legal obligation triggered by high-dose animal studies. Naturally occurring myrcene in hops, cannabis, citrus, and other plants was not affected by this regulatory change.