Quick answer
The entourage effect is the idea that cannabinoids, terpenes, and other compounds in cannabis change how each other work when a person consumes them together. Under this idea, a whole plant extract produces effects that differ from isolated THC or isolated CBD. The term comes from a 1998 paper by Shimon Ben-Shabat and Raphael Mechoulam in the European Journal of Pharmacology.
what is the entourage effect in cannabis
Where the term started
Ben-Shabat and Mechoulam studied two endogenous compounds: 2-arachidonoyl glycerol (2-AG) and 2-arachidonoyl glycerol ether. The second compound showed no activity on its own. It boosted the activity of 2-AG at cannabinoid receptors. The authors called this boost an entourage effect. Later writing moved the word from endogenous lipids to plant compounds.
Entourage Effect Gummies and Tinctures: A Practical Buying Guide
Compounds named in the theory
- Cannabinoids: THC, CBD, CBG, CBC, CBN, THCV. More than 100 are identified in cannabis.
- Terpenes: myrcene, limonene, linalool, pinene, beta-caryophyllene, terpinolene. More than 100 appear in cannabis.
- Flavonoids: cannflavin A and B, quercetin, apigenin.
What studies show
Most support comes from cell cultures and animal models.
- CBD reduces some THC effects in human trials, including anxiety and heart rate increases. This is one interaction with human data.
- Beta-caryophyllene binds CB2 receptors in rodent and cell studies.
- Some terpenes change THC absorption or sedation in animal models.
Human trials that compare a full-spectrum extract against isolated THC at matched doses are few. A 2019 review by Ethan Russo in Frontiers in Plant Science argues for the effect. Reviews in 2020 and 2021 found the human evidence weak or mixed. The National Cancer Institute states that evidence for the entourage effect in people is limited.
What is not known
Dose matters. A terpene amount that changes a receptor in a lab dish may not reach the same level in a person who inhales or eats cannabis. Terpene content varies by batch, plant genetics, and storage. Most published studies use cell cultures, not people.
Reading a product label
Labels list THC, CBD, and sometimes terpenes. A full-spectrum or whole-plant label means the product keeps other plant compounds. A distillate or isolate label means the product is refined to one or a few cannabinoids. No US federal standard defines these terms, and state rules differ. Cannabis remains illegal under federal law.