In a randomized controlled trial of 60 children with autism, 12 weeks of CBD-rich cannabis extract significantly improved social interaction, anxiety, agitation, eating patterns, and concentration compared to placebo.
Autism researchers, pediatric neurologists, and families exploring ASD therapies
Social interaction improved significantly (p=0.0002)
What the researchers found
CBD-rich cannabis extract produced significant improvements in social interaction (p=0.0002), anxiety (p=0.016), psychomotor agitation (p=0.003), number of meals per day (p=0.04), and concentration (p=0.01, mild cases only). Only 9.7% of the treatment group experienced adverse effects (dizziness, insomnia, colic, weight gain), all mild.
Why it matters
This is one of the few randomized controlled trials examining CBD for autism in children. Social interaction, a core diagnostic criterion for ASD, showed the strongest improvement, suggesting CBD may address a fundamental challenge of the condition rather than just peripheral symptoms.
The numbers in context
60 children, ages 5-11. 12-week treatment. Social interaction: F=14.13, p=0.0002. Anxiety: F=5.99, p=0.016. Psychomotor agitation: F=9.22, p=0.003. Concentration improved only in mild cases (p=0.01). Adverse effects in 9.7% (3 children).
How the study worked
Randomized, double-blind, placebo-controlled clinical trial of 60 children aged 5-11 years with ASD. The treatment group received CBD-rich cannabis extract for 12 weeks. Outcomes were analyzed using two-factor mixed ANOVA.
What this study cannot tell us
Small sample (60 children). Single-center study. 12-week follow-up may not capture long-term effects. The concentration improvement was limited to mild ASD cases. Details on the specific CBD:THC ratio and dosing were limited in the abstract.
How to read the evidence
Randomized, double-blind, placebo-controlled design is the gold standard, though the small sample size and single center temper the strength.
When this study was published
2024 journal publication (submitted 2021)
The bigger picture
With ASD affecting 1 in 36 children and no pharmacological treatment for core symptoms, a well-tolerated intervention that improves social interaction is noteworthy. This trial, while small, adds to a growing evidence base for cannabinoid-based approaches to autism.
Questions still open
- What is the optimal CBD dose and formulation for children with ASD? Do the improvements persist after stopping treatment? Would children with more severe ASD also benefit with longer treatment?
Common questions
Can CBD help children with autism?
Which autism symptoms improved most with CBD?
Read the original research
Evaluation of the efficacy and safety of cannabidiol-rich cannabis extract in children with autism spectrum disorder: randomized, double-blind, and placebo-controlled clinical trial.
Trends in psychiatry and psychotherapy, 46, e20210396
Citation
Silva, Estácio Amaro da; Medeiros, Wandersonia Moreira Brito; Santos, João Paulo Mendes Dos; Sousa, João Marçal Medeiros de; Costa, Filipe Barbosa da; Pontes, Katiúscia Moreira; Borges, Thaís Cavalcanti; Espínola, Carlos; Andrade E Silva, Ana Hermínia; Nunes, Eliane Lima Guerra; Alves, Nelson Torro; Rosa, Marine Diniz da; Albuquerque, Katy Lísias Gondim Dias de. (2024). Evaluation of the efficacy and safety of cannabidiol-rich cannabis extract in children with autism spectrum disorder: randomized, double-blind, and placebo-controlled clinical trial.. Trends in psychiatry and psychotherapy, 46, e20210396. https://doi.org/10.47626/2237-6089-2021-0396
Explore the wider topic
- CBD Oil Quality Guide: How to Avoid Snake Oil
- Anxiety After Quitting Weed: When to Consider Medication
- Cannabis for Chemotherapy Nausea: What the Evidence Actually Shows
- Cannabis for Chronic Pain: What the Research Actually Supports
- Cannabis and Epilepsy: The Epidiolex Story and What It Means
- Does CBD Actually Work for Anxiety? What the Evidence Shows
- Does CBD Help with Weed Withdrawal? What Studies Show
- CBD vs THC: The Differences That Actually Matter
- The Proven Medical Benefits of Cannabis: What Research Supports
- Quitting Weed Before Surgery
- Weed and Medications: What Changes When You Quit
- Quitting Weed During Pregnancy: What You Need to Know
- Quitting Weed While Pregnant: What You Need to Know
- Cannabis and Older Adults: Risks Seniors Should Know
- Cannabis and Breastfeeding: THC in Breast Milk