Aroma profile
How it Smells
The aroma of limonene is described as:
Effects
Linked Effects
These effects are based on early-stage research in animals and cells. They are not proven in humans. Do not change your treatment based on this information.
About
What is Limonene?
Limonene is the terpene responsible for that sharp, clean citrus smell. It is one of the most widely found terpenes in nature and is the main compound that gives lemon and orange peel their unmistakable scent. In cannabis, strains high in limonene often smell like a fresh citrus fruit or lemon sherbet.
As a monoterpene, limonene is a relatively simple molecule that is highly volatile, meaning it evaporates quickly. This is why cutting a lemon releases that burst of smell almost immediately. In cannabis, limonene is often most noticeable in the first wave of aroma when a jar is opened (Booth and Bohlmann, 2019).
Effects in detail
What the Research Says
Limonene is strongly associated with mood-lifting and stress-reducing effects. Laboratory studies have found it can reduce anxiety-like behaviour in animals (Nuutinen, 2018). Several clinical and preclinical studies suggest it may act on serotonin and dopamine pathways in the brain, which are linked to mood regulation.
Research by Baram et al. (2022) found that limonene, like myrcene, can activate CB2 receptors. This means it is not merely adding aroma: it may interact with the body's endocannabinoid system directly. Some studies also report anti-inflammatory and antioxidant properties at higher concentrations.
Everyday sources
Where You Find it in Daily Life
Limonene is everywhere in the kitchen. The white pith and coloured skin of any citrus fruit contain high concentrations of it. Lemon-flavoured cleaning products almost always use limonene as the active fragrance ingredient, and it is approved as a food flavouring across the UK and EU.
You will also find limonene in rosemary, juniper berries, and peppermint. It is used extensively in the fragrance industry and is one of the most commonly added flavours in food and drinks.
Research
Key Studies
A key study by Russo (2011) highlighted limonene as a terpene with notable anti-anxiety and antidepressant potential based on animal and in vitro research. He proposed that the entourage effect partly relies on limonene interacting with serotonin receptors.
Baram et al. (2022) later confirmed that limonene can activate endocannabinoid receptors at physiologically relevant concentrations. This was a significant finding because it moved limonene from a simple aromatic compound to a potentially pharmacologically active molecule in its own right.
References
- Baram, L. et al. (2022) 'Major cannabis terpenes, applied individually and in combination, activate endogenous cannabinoid CB1 and CB2 receptors', Frontiers in Pharmacology, 13, 1040962. doi: 10.3389/fphar.2022.1040962.
- Booth, J.K. and Bohlmann, J. (2019) 'Terpenes in Cannabis sativa: from plant genome to humans', Plant Science, 284, pp. 67-72. doi: 10.1016/j.plantsci.2019.03.022.
- Nuutinen, T. (2018) 'Medicinal properties of terpenes found in Cannabis sativa and Humulus lupulus', European Journal of Medicinal Chemistry, 157, pp. 198-228. doi: 10.1016/j.ejmech.2018.07.076.
- Russo, E.B. (2011) 'Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects', British Journal of Pharmacology, 163(7), pp. 1344-1364. doi: 10.1111/j.1476-5381.2011.01238.x.
