Research study · Journal of Psychopharmacology · 2026
Acute behavioural effects of low-dose cannabidiol: A randomised crossover trial in healthy volunteers
A 2026 study in Journal of Psychopharmacology tested cannabidiol. Low-dose CBD may produce a pleasant drug effect. Only the highest dose tested, 200 mg, produced a small pleasant feeling, and that was with a pure laboratory product taken after a large high-fat meal.
Study overview
Clinicians should be cautious when recommending low-dose CBD products, as the evidence for their effects is still inconclusive.
Findings
Low-dose CBD may produce a pleasant drug effect. Evidence for psychotropic effects at non-clinical doses is sparse. Further research is needed to confirm findings.
Why this matters
Only the highest dose tested, 200 mg, produced a small pleasant feeling, and that was with a pure laboratory product taken after a large high-fat meal. It offers little support for the much smaller doses in everyday CBD products, and it says nothing about longer use, other forms, or people taking CBD for a medical reason.
Abstract
Background: Cannabidiol (CBD) is widely consumed in low-dose products. However, evidence for its psychotropic effects at non-clinical doses is sparse and inconsistent.
Aims: To characterise the acute behavioural effects of low-dose synthetic CBD in healthy volunteers. We hypothesised that 200mg of CBD would produce a greater peak pleasant drug effect than a placebo.
Methods: In a triple-blind, randomised, crossover trial at the CHUM research centre, Montreal, Canada, 70 healthy occasional cannabis users received single oral doses of 20, 50, 100 and 200mg synthetic CBD and placebo immediately after a high-fat meal. The primary outcome, a participant-rated visual analogue scale of pleasant drug effect (0–100), was assessed at five timepoints post-dosing during each visit. Other measurements included additional participant ratings of drug effects, as well as positive and negative affect, dissociation, anxiety, blood pressure, heart rate, and respiratory rate.
Results: Two hundred milligrams of synthetic CBD dose produced an average 12.8% [95% CI =3.8% to 21.8%] higher peak pleasant drug effect score compared to placebo (Cohen’s d =0.479 [0.089 to 0.869], pcorr=0.044). No other dose of CBD showed a significant effect for the primary outcome versus placebo. All adverse events were mild or moderate in severity.
Conclusions: The highest dose of CBD tested produced a slight but perceptible pleasurable subjective drug effect. This effect may differ based on prandial state and in clinical populations and populations with heavier cannabis use. Single doses of 100mg synthetic CBD or less are unlikely to produce any discernible psychoactive effect in healthy, occasional users.
Citation
Chester LA, Hebert FO, Lachance-Touchette P, Mahroug A, Abboud A, McCrea TP, et al. Acute behavioural effects of low-dose cannabidiol: A randomised crossover trial in healthy volunteers. Journal of Psychopharmacology (2026). PubMed 42454450 · DOI
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Reviewed by Dr. Caplan on September 17, 2026.
This page is general education about a published study. It is not medical advice and does not create a doctor-patient relationship. For care specific to you, book a consultation.