Oral CBD did not consistently reduce THC effects in a controlled trial
Randomized double-blind placebo-controlled crossover trial
Published Jul 25, 2024 · Verified Oct 10, 2026
Study overview
In 37 healthy volunteers, the highest tested oral CBD condition increased several effects of oral THC and THC exposure in blood. Lower CBD conditions did not significantly change the measured THC effects.
Evidence & interpretation
Five-way crossover design testing oral THC with placebo or three CBD conditions. Results challenge the general claim that adding CBD reliably counteracts THC. This entry reports research, not treatment instructions.
Limitations
A small acute study in healthy volunteers using specific oral formulations. Findings cannot be assumed to apply to other routes, products, patterns of use or clinical populations.
Original citation
Clinical Pharmacology & Therapeutics / PubMed ↗
This research entry is informational and is not a clinical recommendation. Consult qualified health professionals about personal medical questions.