What the research actually shows
Clinical trials on CBD and anxiety show mixed but promising results. Some randomized controlled trials find CBD lowers anxiety symptoms compared to a placebo. Others find little or no difference. Researchers agree that the studies done so far are too small, too short, and too different from each other to draw firm conclusions.
This article walks through what controlled trials have found, where the evidence is weak, and what scientists still don’t know.
Stop and call your doctor if you notice these signs
The U.S. Food and Drug Administration (FDA) has flagged specific risks connected to CBD use. Get medical advice right away if you notice:
- Yellowing of the skin or eyes, dark urine, or ongoing stomach pain, which can be signs of liver injury
- Extreme drowsiness or trouble staying alert, especially if you also take alcohol, sleep medication, or other drugs that slow brain activity
- New or worsening side effects after starting CBD or after changing your dose
Never stop or change a prescribed anxiety medication on your own. Talk with a qualified healthcare provider first.
CBD, CBG, delta-8 and delta-9: what’s the difference?
Cannabis and hemp plants contain many different compounds. People often mix these terms up, so here’s what separates them.
- CBD (cannabidiol): A non-intoxicating compound. It does not produce a “high.” Most anxiety research focuses on this compound.
- CBG (cannabigerol): Another non-intoxicating compound, sometimes called a “minor cannabinoid.” Human research on CBG and anxiety is much more limited than research on CBD.
- Delta-8 THC: A psychoactive compound with milder effects than delta-9 THC, according to available research. It is often made by chemically converting CBD from hemp.
- Delta-9 THC: The main psychoactive compound in marijuana. It produces the “high” associated with cannabis use.
- Full spectrum: Contains CBD along with other cannabinoids and trace THC.
- Broad spectrum: Contains CBD and other cannabinoids, with THC removed or reduced to non-detectable levels.
- Isolate: Contains only CBD, with no other cannabinoids.
Product labels use these terms differently across brands. Always check a product’s Certificate of Analysis (COA) rather than relying on the label alone.
What controlled trials have found so far
A 2024 systematic review of randomized controlled trials looked at 11 studies published between 2013 and 2023. The reviewers found the results were inconsistent. Studies used different anxiety disorders, different CBD doses, different treatment lengths, and different ways of measuring anxiety. The authors said CBD may reduce anxiety, but better-designed trials are still needed.
A separate 2024 systematic review and meta-analysis pooled data from eight studies covering 316 participants. It found a significant reduction in anxiety among people who took CBD compared to control groups.
Earlier controlled research found single doses of CBD reduced anxiety during stressful tasks, such as public speaking, in people with social anxiety disorder. This type of study looks at one-time, acute dosing rather than daily long-term use.
Taken together, the pattern in the evidence is this: short-term, single-dose studies in controlled settings show anxiety-reducing effects for some people. Evidence for daily, long-term use is much thinner.
Why this evidence has real limits
Reviewers who study this topic point to the same problems again and again:
- Small sample sizes. Many trials include only a few dozen participants, which makes results less reliable.
- Different anxiety conditions grouped together. Social anxiety disorder, generalized anxiety disorder, and anxiety linked to other conditions don’t necessarily respond the same way.
- Inconsistent dosing. Trials have used a wide range of doses and delivery methods, so there’s no agreed-upon effective dose.
- Short study periods. Most controlled trials test a single dose or a few weeks of use, not months or years.
- Risk of bias. Reviewers have flagged methodological weaknesses across many of the available trials.
Because of these gaps, no major health authority has approved an over-the-counter CBD product specifically to treat an anxiety disorder.
What remains unknown
According to the FDA, several basic questions about CBD are still unanswered, including:
- What happens with daily CBD use over long periods of time
- What level of intake triggers known risks
- How different consumption methods (oral, topical, smoking, vaping) affect how much CBD the body absorbs
- How CBD interacts with other herbs and plant-based supplements
- Whether the reproductive effects seen in animal studies also occur in humans
For anxiety specifically, researchers still don’t know the ideal dose, the best method of taking CBD, or which anxiety conditions respond most reliably.
Known safety risks to weigh
The FDA has identified specific risks tied to CBD use, based on data from the one FDA-approved CBD drug and other published research:
- Liver injury: CBD can affect the liver. This risk is usually caught through blood tests and monitored by a healthcare provider.
- Drug interactions: CBD can change how other medications work, and other medications can change how CBD affects you. This includes prescription drugs and some herbal supplements.
- Sedation risk: Combining CBD with alcohol or other drugs that slow brain activity, including some anxiety and sleep medications, raises the risk of drowsiness and injury.
- Reproductive effects: Animal studies have shown effects on male fertility. It isn’t yet known whether this applies to humans.
- Common side effects: Drowsiness, appetite changes, diarrhea, and mood changes such as irritability have been reported.
Extra caution for these groups
- Pregnant or breastfeeding people: The FDA strongly advises against using CBD, THC, or marijuana in any form during pregnancy or while breastfeeding.
- Anyone taking prescription anxiety, sleep, or seizure medication: Ask a pharmacist or doctor about interaction risk before adding CBD.
- People with liver conditions: Talk to a healthcare provider before use, and ask about monitoring liver function.
- People planning to have children: Discuss the unresolved questions about reproductive effects with a healthcare provider.
Checklist before considering CBD for anxiety
- Talk with a healthcare provider first, especially if you take any other medication
- Ask about interaction risk with your current prescriptions
- Look for a Certificate of Analysis (COA) from an independent lab before buying any product
- Understand that “full spectrum,” “broad spectrum,” and “isolate” describe different THC content, not different strength
- Watch for liver injury warning signs and stop use if they appear
- Don’t use CBD as a replacement for a diagnosed treatment plan without medical guidance
Frequently asked questions
Does CBD work for anxiety?
Some controlled trials show CBD reduces anxiety symptoms, especially with single doses in stressful situations. Other well-designed studies show little or no benefit. Researchers describe CBD as a promising but unproven option, not a confirmed treatment.
Is CBD the same as marijuana?
No. CBD is one compound found in the cannabis plant. Marijuana is a type of cannabis plant material that contains many compounds, including both CBD and THC. CBD itself does not produce a “high.”
Is CBD legal?
Legal status depends on where you live and how the product is made and sold. It also changes over time as laws are updated. Check current state and local rules before buying or using any hemp or cannabis product.
Can I take CBD with my anxiety medication?
Don’t assume it’s safe. CBD can change how other medications work, including some anxiety and sleep medications. Ask your prescribing doctor or pharmacist before combining them.
Educational disclaimer
This article is for educational purposes only. It does not diagnose, treat, cure, or prevent any disease, and it is not a substitute for advice from a qualified healthcare provider. Talk with a doctor or pharmacist before starting, stopping, or changing any medication or supplement, including CBD. For more on how we verify information on this site, see our Editorial Policy and Medical Disclaimer. You can browse more cannabinoid science coverage in our Cannabis and Cannabinoid Science section, and learn more about our review process on our About page.