CBD and Anxiety: What Does the Human Research Actually Show?

Search online for CBD and anxiety and you will find plenty of confident claims: that CBD “calms the nervous system”, “reduces anxiety”, “stops panic” or provides a natural alternative to conventional treatment.

The human research is much less straightforward.

There are clinical studies investigating cannabidiol and anxiety, and some have reported encouraging findings. Others have found little or no benefit. Studies have also used very different CBD formulations, populations and doses — often at amounts far above those normally associated with UK CBD food products.

For that reason, research into CBD and anxiety should be discussed as research, not turned into a promise about a CBD oil sold as a food supplement.

The UK Food Standards Agency is particularly clear on this point: CBD food products are not medicines, there are currently no authorised health claims for CBD food products, and businesses should not claim they relieve or treat conditions such as anxiety. Read the FSA guidance.

What is anxiety?

Anxiety is a normal human response to situations we perceive as threatening or uncertain. Feeling nervous before an interview, examination or important event does not necessarily mean someone has an anxiety disorder.

Persistent or severe anxiety can be very different. Generalised anxiety disorder, panic disorder and social anxiety disorder are recognised conditions that can significantly affect everyday life.

Current NICE guidance uses a stepped-care approach for generalised anxiety disorder. Depending on severity and response to earlier steps, evidence-based options can include self-help approaches based on cognitive behavioural therapy, CBT or applied relaxation, and certain prescribed medicines. CBD is not included among the recommended treatments in that guidance. Read the NICE recommendations.

If anxiety is persistent, worsening or interfering significantly with daily life, seeking appropriate professional support is more important than relying on a food supplement.

Why are researchers studying CBD and anxiety?

CBD interacts with biological systems that researchers believe may be relevant to stress and anxiety responses.

However, biological plausibility is not the same thing as proving that a consumer CBD product treats anxiety.

Laboratory findings about receptors or signalling pathways can help researchers decide what to investigate next, but they cannot by themselves tell us whether CBD will improve an anxiety disorder in real people.

For readers interested in the underlying biology, our Endocannabinoid System: A UK Guide to How CBD Works explains the subject separately without needing to duplicate it here.

What have human CBD and anxiety trials found?

The results so far are mixed.

A 2023 double-blind randomised trial studied 63 people with high levels of worry. Participants received either 50mg CBD, 300mg CBD or placebo, first acutely and then repeatedly for two weeks.

Neither CBD dose reduced worry or anxiety after a single dose. Repeated CBD also did not reduce the cognitive symptom of worry. The researchers did find some evidence that 300mg affected physical symptoms of anxious arousal over the two-week period. They described the overall effect as modest and potentially specific to physical rather than cognitive symptoms. View the study on PubMed.

That is interesting, but it is very different from saying that CBD has been proven to treat anxiety.

Another trial found no advantage when CBD was added to exposure therapy

A separate randomised controlled trial involved people with social anxiety disorder or panic disorder with agoraphobia who had not responded adequately to previous treatment.

Participants received exposure therapy together with either 300mg oral CBD or placebo. Eight weekly therapy sessions were studied, with follow-up continuing afterwards.

CBD did not improve treatment outcomes compared with placebo. View the study on PubMed.

This is useful evidence because unsuccessful trials matter just as much as positive ones when judging the overall picture.

What about studies that have reported stronger results?

There are positive findings too.

A 2024 multicentre randomised trial involving 178 participants with mild-to-moderate anxiety disorders tested a specialised nanodispersible CBD oral solution against placebo over 15 weeks. The researchers reported substantial improvements on several anxiety measures in the CBD group. View the study on PubMed.

Those results deserve attention, but there are important reasons to be cautious about applying them to ordinary CBD oils.

First, the researchers tested a particular nanodispersible formulation designed to alter CBD delivery and pharmacokinetics — not a conventional CBD-in-MCT food supplement.

Second, several authors were employees or senior officers of companies involved with the investigational product. That does not invalidate a study, but conflicts of interest are relevant when interpreting evidence and should be disclosed.

Independent replication using comparable methods would make the finding much stronger.

What about CBD and public-speaking anxiety?

Some of the most frequently quoted CBD studies involve simulated public-speaking tests rather than everyday treatment of an anxiety disorder.

For example, a randomised study involving 57 healthy men tested 150mg, 300mg and 600mg CBD against placebo before a simulated speech. Only the 300mg dose produced a statistically significant reduction in the study's anxiety measure; neither 150mg nor 600mg did. View the study on PubMed.

That unusual dose-response is one reason it is too simplistic to claim that “more CBD means more anxiety relief”.

We have a separate CBD for Public Speaking Anxiety UK article, so that page should examine those experiments properly rather than having this general anxiety article compete for the same search intent.

Research doses and UK consumer guidance are very different

This is one of the most important details that frequently disappears from CBD marketing.

Many anxiety studies have used hundreds of milligrams of CBD.

The FSA, by contrast, currently advises healthy adults consuming CBD as a food to limit intake to 10mg per day. It also advises people taking medication, those under 18, and people who are pregnant, breastfeeding or trying to conceive to avoid CBD unless it is being used under medical direction.

The FSA also warns that CBD can interact with medicines. See the FSA safety guidance.

So a study using 300mg cannot sensibly be converted into instructions telling somebody how many drops of a retail CBD oil to take for anxiety.

The research dose answers a scientific question within that particular trial. It is not a consumer dosage recommendation.

Can CBD oil be sold as a treatment for anxiety in the UK?

A normal CBD food product should not be marketed that way.

The FSA says there are no authorised health claims for CBD food products and specifically identifies claims about treating or relieving anxiety as inappropriate for CBD foods.

There is a separate medicines regime. The MHRA states that CBD-containing products used or marketed for medical purposes are medicines, and products making medicinal claims fall within medicines regulation. Unless exempt, medicinal products require the appropriate marketing authorisation before they can legally be sold, supplied or advertised as medicines. Read the MHRA statement.

This distinction is important:

Studying CBD for anxiety is permitted. Discussing that research is permitted. Selling an ordinary CBD food product with a claim that it treats anxiety is a different matter.

Does CBD make you high?

CBD and THC are different cannabinoids.

Concerns about intoxication deserve their own explanation, particularly because the composition of CBD products can vary. We cover that subject in our CBD vs THC UK: Can CBD Get You High? guide rather than repeating the entire topic here.

Likewise, questions about legality and controlled cannabinoids are covered in our separate Is CBD Legal in the UK? guide.

Keeping those subjects separate gives each article one clear job.

How should you judge CBD research?

When you see a headline claiming that “a study proves CBD works for anxiety”, look beyond the headline.

• Was the research performed in humans or animals?
• Was it randomised and placebo-controlled?
• How many people took part?
• Did they actually have an anxiety disorder?
• Was CBD taken once or repeatedly?
• What dose was studied?
• Was it ordinary CBD oil or a specialised pharmaceutical formulation?
• What outcome was measured?
• Were the results independently replicated?
• Were there relevant financial conflicts of interest?

The word “CBD” alone does not make two studies equivalent.

What should you check when choosing a CBD product?

Research into anxiety should not be used as a shortcut around basic product-quality checks.

If you decide to buy CBD, check what type of CBD is actually being used, how much CBD the product contains, what the laboratory evidence covers and whether the seller clearly distinguishes an ingredient certificate from testing of the finished product.

Our How to Choose High-Quality CBD Oil UK: COA Buyer Guide explains those checks in detail.

The bottom line

There is genuine scientific interest in CBD and anxiety, and several human studies have produced findings worth investigating further.

But the results are not consistent.

Some trials have reported improvements, some have found modest effects on particular anxiety symptoms, and others have found no meaningful advantage over placebo. Different formulations, doses and experimental settings make direct comparisons difficult.

Most importantly, clinical research involving CBD should not be turned into a claim that an ordinary retail CBD oil can treat anxiety.

For UK consumers, the current regulatory position is much simpler than many marketing pages suggest: CBD foods are not medicines and currently have no authorised health claims for anxiety.

If anxiety is persistent or substantially affecting everyday life, appropriate healthcare and evidence-based support should take priority.