Marijuana Moment: Marijuana’s ‘Entourage Effect’ Varies By Terpene And Cannabinoid Receptor, New Study Suggests

[Tokeativity]

Another study has found evidence of an “entourage effect” where marijuana compounds work together to achieve results that are more robust than the sum of their parts—but it also says that the effect may be more nuanced than earlier research has indicated.

Specifically, researchers at the Open University of Israel determined that different terpenes don’t simply add to the effects of THC. It depends on the type of terpenes involved and the cannabinoid receptors that are targeted.

In addition to potentiating THC activation in cannabinoid receptors, some interactions are synergistic. That’s the case when terpenes such as borneol, limonene, sabinene, terpineol, α-pinene and ocimene interact with CB1 receptors and when β-caryophyllene and linalool interacts with CB2 receptors.

In other words, the pre-proof study set to be published in the journal Biochemical Pharmacology suggests the entourage effect is more complicated than it’s commonly understood to be.

“Terpene mixtures displayed dose-dependent CB₁R activation, and several mixtures synergistically enhanced THC responses,” it found. “Together, our findings suggest that cannabis terpenes may act as both partial orthosteric agonists and allosteric modulators at CB₁R and CB₂R.”

“These findings refute early, overly broad interpretations of a generalized ‘entourage effect,’ replacing them with terpene-specific mechanistically based framework.”

“These results provide a mechanistic framework for cannabinoid–terpene synergy and highlight the importance of receptor specificity and of formulation design in shaping terpene mediated activation,” the researchers wrote. “These findings stress the need for terpenes selection for formulations tailor for specified medicinal needs.”

While the results must still be backed up by future studies, the authors said that, given that terpenes are generally recognized as safe, they “may offer regulatory and safety advantages over synthetic cannabinoid-receptor modulators.”

“Future work may elaborate the mechanistic basis of terpene-mediated modulation of cannabinoids activity, using mutagenesis, structural modeling, and allosteric site mapping,” the study says. “In vivo or clinical studies will be essential to validate whether the synergistic and additive interactions observed at the receptor level, translate into enhanced analgesic, anti-inflammatory, or neuroprotective effects.”

“Our findings support a shift from non-specific ‘full-spectrum’/ ‘whole-plant’ preparations, toward rationally designed, cannabinoid products enriched with selected terpenes. Such formulations may potentially leverage specific terpene–THC interactions, either synergistic or additive, to target distinct therapeutic needs.”

“Overall, our findings provide a mechanistic framework for understanding how terpenes may contribute to the [endocannabinoid system] pharmacology and highlight their potential utility in the development of safer and more efficacious cannabis-based therapeutics,” the study concluded.

There’s been growing interest into the entourage effect with cannabis over recent years.

In 2024, for example, a review of research into the synergistic effects of the chemical components in cannabis found that terpenes, popularly credited with modulating the experience of cannabis, may indeed be “influencers in the therapeutic benefits of cannabinoids,” though for now that influence “remains unproven.”

A separate study published that year in the International Journal of Molecular Sciences said that the “complex interaction between phytocannabinoids and biological systems offers hope for novel treatment approaches,” potentially laying the groundwork for a new era of innovation in cannabis-based medicines.

“The plant Cannabis exhibits an effect called the ‘entourage effect’, in which the combined actions of terpenes and phytocannabinoids results in effects that exceed the sum of their separate contributions,” that study found. “This synergy emphasizes how important it is to consider the entire plant when utilizing cannabinoids medicinally as opposed to just concentrating on individual cannabinoids.”

A federally funded study published in 2024, meanwhile, found that terpenes could be “potential therapeutics for chronic neuropathic pain,” finding that an injected dose of the compounds produced a “roughly equal” reduction in pain markers when compared to a smaller dose of morphine. Terpenes also appeared to enhance the efficacy of morphine when given in combination.

Unlike with morphine, however, none of the studied terpenes produced a meaningful reward response, that research found, indicating that “terpenes could be effective analgesics with no rewarding or dysphoric side effects.”

Another study published that year looked at the “collaborative interactions” between cannabinoids, terpenes, flavonoids and other molecules in the plant, concluding that a better understanding of the relationships of various chemical components “is crucial for unraveling cannabis’s complete therapeutic potential.”

Other recent research funded by the National Institute on Drug Abuse (NIDA) found that a citrusy-smelling terpene in marijuana, D-limonene, could help ease anxiety and paranoia associated with THC. Researchers similarly said the finding could help unlock the maximum therapeutic benefit of THC.

A separate study in 2023 found that cannabis products with a more diverse array of natural cannabinoids produced stronger psychoactive experiences in adults, which also lasted longer than the high generated by pure THC.

And a 2018 study found that patients suffering from epilepsy experience better health outcomes—with fewer adverse side effects—when they use plant-based CBD extracts compared to “purified” CBD products.

Scientist last year also discovered “previously unidentified cannabis compounds” called flavorants that they believe are responsible for the unique aromas of different varieties of marijuana. Previously, many had thought terpenes alone were responsible for various smells produced by the plant.

Similar phenomena are also beginning to be recorded around psychedelic plants and fungi. In March, for example, researchers published findings showing that use of full-spectrum psychedelic mushroom extract had a more powerful effect than chemically synthesized psilocybin alone. They said the findings imply that mushrooms, like cannabis, demonstrate an entourage effect.

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