Terpenes: What They Are, Common Cannabis Terpenes and the Entourage Effect

Terpenes are the aromatic compounds that give plants such as hops, citrus and hemp their smell and much of their flavor. Cannabis makes them in the same sticky resin glands that produce CBD and THC, and the most common ones, such as myrcene, limonene, linalool, beta-caryophyllene and pinene, also occur in everyday foods and spices. Many CBD brands promote terpenes for an entourage effect, the idea that they boost what cannabinoids do. Lab results on that idea conflict, and human evidence is limited to a few small studies. This guide explains what terpenes are, what the research shows and how to check them on a label.

Peptide Labs sells hemp-derived CBD products, some of which list terpenes. This guide is general information as of October 1, 2026, not medical advice.

What are terpenes?

Terpenes are a large family of natural compounds that plants assemble from 5-carbon building blocks. A 2017 study in PLOS ONE describes how cannabis makes them in glandular trichomes, the tiny resin glands concentrated on female flowers. Two main groups dominate: monoterpenes, built from two of those units, and sesquiterpenes, built from three. They are responsible for much of the scent of cannabis flowers. Hops, a close relative of cannabis, depend on terpenes for the flavor they bring to beer.

Cannabinoids such as CBD and THC are chemical cousins: a 2011 review in the British Journal of Pharmacology notes that terpenoids share a precursor with them. You may also see the word terpenoid, which scientists often use for related compounds that contain oxygen, such as linalool. Terpenes are volatile, meaning they evaporate easily, which is why you can smell them.

Common cannabis terpenes

A 2019 review in Plant Science notes that cannabis resin holds hundreds of terpene and cannabinoid compounds, many not yet clearly identified. These are the cannabis terpenes you are most likely to see on a label or lab report:

Beta-caryophyllene stands out. A 2008 study in PNAS found that it binds selectively to the CB2 receptor, one of the two main cannabinoid receptors, and acts on it, while effects seen in mice disappeared in mice lacking CB2. The CB1 receptor, not CB2, drives the mental effects of cannabis, and the authors described beta-caryophyllene as a non-psychoactive dietary cannabinoid. These are lab and animal findings, not evidence of any effect from a CBD product.

The entourage effect: what the evidence shows

The entourage effect idea holds that cannabinoids and terpenes work better together than alone. Its most cited statement is the 2011 review above, written by a researcher then working for a cannabis drug company, which proposed several possible interactions and methods to test them. Since then, laboratory results have pointed in different directions:

• 2019, Australia. Six common cannabis terpenes, including myrcene, limonene, linalool and beta-caryophyllene, neither activated CB1 or CB2 receptors in cells nor changed THC’s signaling. The authors concluded that if an entourage effect exists, it does not work through those receptors.
• 2020, New Zealand. Apart from a possible weak interaction of beta-caryophyllene with CB2, five terpenes had no direct effect on cannabinoid receptors and did not change how THC or CBD bound to them.
• 2021, United States. A mouse and cell study found that four terpenes produced cannabinoid-like behaviors in mice and added to a synthetic cannabinoid’s effect. The authors still called the entourage hypothesis controversial, with limited evidence.
• 2024, United States. In a double-blind study of 20 adults at Johns Hopkins, inhaled limonene alone did nothing measurable, but the highest limonene amount taken with THC lowered ratings of anxiety and paranoia compared with THC alone. A co-author advises a terpene company, and the university later filed a patent application.

None of these studies tested a CBD oil, gummy or softgel, and the one human study involved inhaled THC. The 2019 Plant Science review concluded that medicinal claims about cannabis compounds would benefit from thorough scientific validation. For now, the entourage effect is a hypothesis, not an established reason to pick one product over another.

Terpenes in hemp extracts: natural or added?

Terpenes in CBD oil and other hemp products arrive in two ways. Full-spectrum and broad-spectrum extracts usually keep some of the plant’s own terpenes, while isolate products contain CBD only; our comparison of full spectrum, broad spectrum and isolate explains the difference. Other products add terpenes as named ingredients. The ingredient list tells you which you have: cbdMD’s broad spectrum softgels, for example, list d-limonene among their other ingredients.

Be cautious with strain-style terpene labels. A 2021 study in Nature Plants analyzed more than 100 cannabis samples and found that those labeled Sativa and Indica were genetically indistinct across the genome; the labels tracked only a small number of terpenes. So a phrase such as indica-type terpenes describes a blend’s style, not a proven effect. Minor cannabinoids such as CBG and CBN are a separate group from terpenes; see our CBG, CBN and CBC guide.

Are terpenes safe?

Several common terpenes are approved food flavorings. FDA regulations list limonene and linalool among synthetic flavoring substances generally recognized as safe for their intended use, and permit beta-caryophyllene and alpha- and beta-pinene as synthetic flavoring additives. That status covers small amounts used to flavor food. It says nothing about health effects, and it does not cover inhaling concentrated terpenes.

Myrcene shows how nuanced the rules are. In 2018, the FDA stopped authorizing synthetic myrcene and five other flavorings because animal studies showed cancer, which the law makes an automatic bar. The agency said at the same time that it had found no risk to public health at the levels used in food, and that foods naturally containing myrcene, such as citrus, were unaffected. By the FDA’s estimate, people get about 16,500 times more myrcene from foods that naturally contain it than they did from added flavoring. If you are pregnant, breastfeeding or take medicines, ask a healthcare provider before using concentrated terpene or CBD products.

How to check terpenes on a certificate of analysis

Federal hemp testing centers on total THC, so a terpene panel is an optional extra that many certificates of analysis leave out. When one is included:

• Match the batch or lot number to your product, and check the test date.
• Look for each terpene by name with a measured amount, not just the word terpenes.
• Remember that terpenes evaporate, so levels can drop with heat, air and time.
• Check THC and the other cannabinoids on the same report, especially for full-spectrum products.

Our guide on how to read a CBD certificate of analysis walks through each section, and our CBD gummies vs oil guide covers how carrier oils and formats differ.

Products at Peptide Labs that list terpenes

These labels show the main ways terpenes appear; follow each label and ask a healthcare provider before use if you take medicines:

• Extract Labs Organic CBG Oil is a full spectrum CBG and CBD oil that the brand says contains minor cannabinoids, terpenes and less than 0.3% THC. The trace THC may affect a drug test.
• Medterra Broad Spectrum CBD Oil lists a hemp extract with CBD, CBG, CBN, CBDV and natural terpenes in MCT oil. Medterra describes it as THC-free and does not itemize the terpene amounts.
• Joy Organics THC-Free CBD Softgels list beta-caryophyllene as an added ingredient alongside broad spectrum CBD. They contain bovine gelatin and coconut.

You can compare more labels and lab reports in our CBD category.

Frequently Asked Questions

This article is general information as of October 1, 2026, not medical advice. Questions? Contact us or see CBD vs THC. CBD products sold at Peptide Labs are hemp-derived and are not FDA-approved drugs. The FDA has not approved CBD as a dietary supplement or food ingredient, and hemp product rules vary by state. Check your state’s rules, follow each product label and talk to a healthcare provider before using CBD if you take medicines, are pregnant or nursing, or have a medical condition.

Last reviewed October 2026.

Related guides: Full Spectrum vs. Broad Spectrum vs. CBD Isolate: What’s the Difference?, How to Read a CBD Certificate of Analysis (COA), What Is CBG? CBG, CBN and CBC Explained: Origins, Research and Labels.