Can D-Limonene Reduce THC-Induced Anxiety?
Cannabis contains over 500 chemical compounds, including 100's of aromatic compounds called terpenes, which contribute to the scent profile
Citrus has been used as a remedy since the 10th century. At the proper dose, cannabis can have calming effects that help ease anxiety and pain. However, defining the right dose can be challenging, and taking too much can lead to dramatically contrasting effects, often referred to as paranoia by recreational users. This experience can feel like intense anxiety or panic.
Published research from 2024 suggests that one of the naturally occurring aromatic terpenes found in cannabis, known as d-limonene, may help alleviate anxiety-inducing effects. This means that cannabis strains with a high concentration of d-limonene might allow some users to avoid negative reactions and better experience the therapeutic potential of cannabis.
How Important Are Cannabis Terpenes?
Cannabis plants contain more than 500 chemical compounds, including hundreds of aromatic compounds called terpenes, which contribute to the plant’s distinct scent profile. For years, it has been speculated that consuming whole flower products rather than isolated compounds like THC or CBD results in a better user experience. This phenomenon, known as the “entourage effect,” is based on the idea that the whole is greater than the sum of its parts. However, the precise mechanisms behind this effect remain unclear, largely due to the multitude of chemicals involved. The entourage effect has significantly influenced how different strains of cannabis are bred and marketed.
In the study, researchers aimed to determine the impact of relatively small concentrations of compounds on cannabis's overall effects. They recruited participants who were not regular cannabis users but had previously reported experiencing anxiety when using it. Twenty participants underwent nine randomized tests in which they inhaled blends with varying levels of vaporized THC and d-limonene or a placebo made of water vapor.
The study was conducted using a double-blind method, meaning that neither the participants nor the researchers knew which active compounds were administered at any point. Following the initial test, 12 of the 20 participants took part in another test, where they received higher doses of d-limonene alongside THC.
The researchers collected blood samples from the participants multiple times during each test—before, immediately after, and at intervals for six hours afterward. Participants were also asked to rate their mood and the effects they experienced. Additionally, their vital signs and cognitive performance were assessed.
The scientists found that as the concentration of d-limonene increased in relation to THC, participants reported fewer anxiety symptoms. Interestingly, while increased d-limonene levels decreased feelings of anxiety or panic, they did not seem to alter the other effects of THC, suggesting a very targeted action.
Why Does D-Limonene Reduce Anxiety?
Although the exact mechanism by which d-limonene reduces THC-induced anxiety is not fully understood, other studies on rodents suggest that it may influence the levels of serotonin, dopamine, and gamma-aminobutyric acid (GABA) in the brain. It appears that d-limonene does not directly interfere with THC's effects on the brain, which is likely why it does not impact the other characteristics of the high.
This study is the first of its kind, and, like all research, has some limitations. Participants were given a vaporized form of cannabis, so it remains uncertain whether the findings apply to other consumption methods like smoking or edibles.
Further studies are being conducted to explore how terpenes interact with one another. The research team is currently investigating other terpenes, such as α-pinene and β-myrcene. Comprehensive research on terpenes may lend credibility to traditional remedies for cannabis-induced anxiety and paranoia, such as chewing lemon peels, peppercorns, or pine nuts, all of which contain naturally occurring terpenes found in cannabis. Citrus fruits have served as a remedy for unwanted effects of cannabis since the 10th century C.E., with records of their use dating back to Persia.
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Liz Filmer
