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Selected Research Results

Research spotlights of selected studies are shown below. For a full list of published NCCIH Research to-date, see PubMed.

Spotlights for 2023

Illustration of CBD and marijuana leaf

When Taken Orally, Δ9-Tetrahydrocannabinol With Cannabidiol Can Result in Stronger Drug Effects Than Δ9-Tetrahydrocannabinol Alone
New research contradicts prior claims and clarifies the interactions between the two main cannabinoids—Δ9-tetrahydrocannabinol (Δ9-THC) and cannabidiol (CBD)—when they are ingested orally as part of an edible cannabis product. The study’s findings suggest that CBD can inhibit the metabolism of Δ9-THC when the two are consumed together, leading to increased effects than when the same dose of Δ9-THC is consumed without CBD. The study, recently published in the journal JAMA Network Open, was led by researchers at Johns Hopkins University School of Medicine and partially funded by the National Center for Complementary and Integrative Health.

February 2023