Myrcene – the most widespread terpene in cannabis

Myrcene -- the most widespread terpene in cannabis

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When you open a bag of quality cannabis flowers and catch that characteristic earthy, slightly fruity aroma reminiscent of ripe mango, there's a high probability you're experiencing myrcene. This monoterpene is the most abundant terpenoid compound in cannabis -- in some strains it comprises up to 50% of all terpenes in the terpene profile. However, myrcene is more than just about aroma. Scientific research shows that this molecule plays a key role in the sedative and anti-inflammatory effects of cannabis and significantly contributes to what scientists call the entourage effect.

What is myrcene and what does its molecule look like

Myrcene (beta-myrcene, C10H16) is an acyclic monoterpene -- its molecule contains no ring structures, which is quite unusual among terpenes. Chemically it is composed of ten carbon atoms and sixteen hydrogen atoms with three double bonds, which give it reactivity and biological activity.

The name comes from the plant Myrcia sphaerocarpa, a Brazilian shrub used in traditional medicine. The boiling point of myrcene is approximately 167 °C -- an important figure especially for vaporizer users, because at this temperature myrcene begins to release and its effects are fully manifested. When vaporizing below this temperature threshold, myrcene remains largely unused.

Aroma and flavor profile

Myrcene has a characteristic, multi-layered aromatic profile:

• Earthy tones -- a base note reminiscent of damp soil and root vegetables
• Nutmeg nuances -- a subtle spiced component adding depth and complexity
• Fruity accents -- a distinct mango and tropical component, which makes myrcene easily recognizable
• Herbal undertones -- reminiscent of fresh basil or thyme

The very mango note is behind the popular theory that consuming mango before using cannabis enhances its effects. The logic is straightforward -- mango contains significant amounts of myrcene, which could theoretically supplement and support the myrcene present in cannabis. This mechanism has not been clearly confirmed in clinical studies, yet it represents an interesting example of possible synergistic interactions between terpenes from different sources.

Where myrcene occurs in nature

Myrcene is far from exclusive to cannabis. It is found in a range of commonly available plants:

Interesting is the botanical relationship of hops and cannabis -- both plants belong to the family Cannabaceae and share myrcene as the dominant terpene. This is no coincidence, but an evolutionary legacy of a common ancestor. This kinship, among other things, explains why the aromatic profile of some heavily hopped craft beers strikingly resembles cannabis strains.

Effects and potential health benefits

Sedative and myorelaxant effects

Myrcene is likely the key contributor to the so-called "couch-lock" effect -- a state of deep physical relaxation and sedation, typical for indica-dominant strains. A study published in Phytomedicine demonstrated that myrcene exhibits pronounced sedative and myorelaxant effects in mice, including prolonged sleep time induced by barbiturates.

The mechanism likely involves modulation of the GABAergic system -- the same neurotransmitter system targeted by benzodiazepines and alcohol. However, myrcene does not act directly on GABA receptors, but indirectly through modulation of cell membrane permeability, thereby facilitating transport of other active substances (including cannabinoids) into the brain. This mechanism is crucial for understanding the entourage effect.

Anti-inflammatory effects

Research published in the Journal of Ethnopharmacology shows that myrcene inhibits the production of prostaglandin E2 (PGE2) and nitric oxide (NO) -- two key mediators of inflammation. In one study, myrcene reduced inflammation comparable to indomethacin, a commonly used nonsteroidal anti-inflammatory drug (NSAID). This finding has practical implications: it explains why full spectrum cannabis products rich in myrcene exhibit stronger anti-inflammatory potential than isolated cannabinoids.

Analgesic effects

Myrcene exhibits pain-relieving effects mediated by activation of opioid receptors. A 1990 study published in the Journal of Pharmacy and Pharmacology demonstrated that myrcene enhances pain relief response in mice and this effect is blocked by naloxone (an opioid receptor antagonist), clearly indicating involvement of the endogenous opioid system. This property makes myrcene a terpene with one of the most interesting analgesic profiles within the cannabis plant.

Antioxidant and chemoprotective properties

Myrcene also exhibits antioxidant activity and in some studies protects DNA from damage caused by mutagens. This opens questions about its potential chemoprotective use. Clinical studies in humans in this area are still lacking, but the in vitro and animal model results are sufficiently interesting to warrant further research.

Cannabis strains rich in myrcene

Myrcene dominates the terpene profile of many popular strains:

Generally speaking, strains with myrcene content above 0.5% of total terpene volume tend to produce stronger sedative effects, while strains with lower myrcene content -- and higher limonene or pinene content -- are more energizing. This rule is a useful guideline when selecting a strain based on desired effects, though the overall effect always depends on the complete terpene and cannabinoid profile.

Entourage effect -- synergy of myrcene with cannabinoids

Myrcene is a key player in the concept of the entourage effect, described by Ethan Russo in his breakthrough work from 2011 "Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects" published in the British Journal of Pharmacology.

Russo describes several key synergies of myrcene:

• Myrcene + THC: Myrcene increases the permeability of the blood-brain barrier, potentially allowing faster onset of THC effects. At the same time, it enhances the sedative and analgesic components of the overall effect.
• Myrcene + CBD: The combination can enhance the anti-inflammatory and anxiolytic effects of both substances. This synergy is particularly interesting for cannabis terpenes in full spectrum products, where the presence of myrcene can significantly influence the resulting therapeutic profile.
• Myrcene + beta-caryophyllene: Together they act on anti-inflammatory pathways from different angles -- myrcene through prostaglandin inhibition, caryophyllene through CB2 receptors. This combination is one of the best documented synergies within terpene research.

Learn more about synergies of cannabinoids and terpenes in our article on minor cannabinoids and the entourage effect.

How to use terpene products with myrcene

Cannabis terpenes and e-liquids with terpenes offer the possibility of targeted use of myrcene without having to work with flower material:

1. Vaporization: Set your vaporizer temperature to 167--185 °C for optimal myrcene release. Lower temperatures preserve more terpenes and are gentler on aromatic components, higher temperatures promote full cannabinoid decarboxylation. The ideal compromise for myrcene is around 170--175 °C.
2. Aromatherapy: Myrcene is part of many essential oils (lemongrass, basil) used in aromatherapy to induce relaxation. A diffuser with these oils can be a simple way to utilize myrcene's effects daily.
3. E-liquids: E-liquids with terpenes offer a convenient way to utilize precisely defined terpene profiles with consistent myrcene content.
4. Full spectrum products: Full spectrum CBD oils naturally contain myrcene and other terpenes, thereby naturally supporting the entourage effect -- unlike CBD isolates, which lack these synergistic components.

Comparison of myrcene with other major cannabis terpenes

FAQ -- Frequently asked questions

Is myrcene psychoactive?

No, myrcene itself is not psychoactive. It does not produce intoxication or altered states of consciousness. However, it can modulate the effects of psychoactive cannabinoids -- particularly THC -- by influencing cell membrane permeability and enhancing the sedative components of the overall effect.

Can consuming mango enhance the effects of cannabis?

This popular theory has a certain logical basis -- mango does indeed contain myrcene, which could supplement the terpene profile of cannabis. However, the specific mechanism has not been confirmed in clinical studies on humans. What is scientifically documented, however: the myrcene present directly in cannabis demonstrably contributes to the sedative and relaxing effects of the strain.

How can I tell if a strain contains a lot of myrcene?

As a rough guide, by smell -- strong earthy, nutmeg and mango tones indicate high myrcene content. However, the precise composition can only be determined by laboratory analysis of the terpene profile. More and more producers now list terpene profiles directly on product labels or in accompanying documentation; it is worthwhile to actively seek this information when selecting a strain.

Is myrcene safe?

Myrcene is generally considered safe. It naturally occurs in many common foods (mango, hops, basil) and the US Food and Drug Administration (FDA) has listed it on the GRAS (Generally Recognized As Safe) list for use as a food additive. In normal cannabis product use, it poses no health risk.

What is the difference between alpha-myrcene and beta-myrcene?

In the context of cannabis, one practically always speaks of beta-myrcene, which is the dominant form occurring naturally in plants. Alpha-myrcene occurs mainly as a synthetic intermediate in the chemical industry. When the cannabis industry speaks of "myrcene," it always means beta-myrcene.

This article is purely informational and educational in nature. It does not constitute medical advice or an invitation to use any substances. Before using any cannabis preparations, consult your doctor.

Sources

1. Russo, E.B. (2011). Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects. British Journal of Pharmacology, 163(7), 1344-1364. pmc.ncbi.nlm.nih.gov/articles/PMC3165946
2. Surendran, S. et al. (2021). Myrcene -- What Are the Potential Health Benefits of This Flavouring and Aroma Agent? Frontiers in Nutrition, 8, 699666. pmc.ncbi.nlm.nih.gov/articles/PMC8369019
3. Rao, V.S. et al. (1990). Effect of myrcene on nociception in mice. Journal of Pharmacy and Pharmacology, 42(12), 877-878.
4. Leafly Terpene Guide: Myrcene. leafly.com/news/cannabis-101/myrcene-terpene
5. Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity. Scientific Reports, 2021. nature.com/articles/s41598-021-87740-8
6. do Vale, T.G. et al. (2002). Central effects of citral, myrcene and limonene, constituents of essential oil chemotypes from Lippia alba. Phytomedicine, 9(8), 709-714.