CBD and Public Speaking Anxiety: What Do Human Studies Show?

Feeling nervous before speaking in front of a room full of people is extremely common. Your heart may beat faster, your mouth can feel dry, and it can suddenly become much harder to remember the words you had rehearsed.

Because cannabidiol (CBD) is frequently discussed online in connection with anxiety, one obvious question is whether researchers have ever specifically tested CBD before public speaking.

Interestingly, they have.

Several human studies have used a simulated public-speaking test to investigate CBD. Some of the findings are encouraging, but they are also considerably more complicated than the simple claim that “CBD calms public-speaking nerves”.

This guide looks at what those experiments actually found, the doses researchers used, their limitations, and why the results should not be turned into a recommendation to take CBD oil before a speech.

Why do researchers use public speaking to study anxiety?

Speaking in front of other people can produce a measurable short-term anxiety response even in otherwise healthy volunteers.

Researchers can therefore use a controlled simulated speech to examine changes in things such as participants' self-reported anxiety, mood, heart rate and blood pressure.

This is useful scientifically, but there is an important distinction:

A public-speaking experiment is not the same as proving that CBD treats an anxiety disorder or that a retail CBD oil will make somebody calmer before a presentation.

The particular CBD formulation, dose, participants and experimental conditions all matter.

The 2011 CBD public-speaking study

One of the best-known studies was published in 2011 and involved people with social anxiety disorder who had not previously received treatment.

Twenty-four participants with social anxiety disorder were divided into two groups. Twelve received 600mg of CBD, while twelve received placebo before taking part in a simulated public-speaking test. A separate healthy control group also completed the test. View the study on PubMed.

The researchers reported lower anxiety-related measures in the CBD group compared with the placebo group during the experiment.

That finding is interesting, but there are several reasons not to overstate it.

The study was small, involving only 24 participants in the CBD/placebo comparison. It examined a single experimental situation, and the CBD dose was far higher than current UK guidance for CBD consumed as a food.

It therefore does not demonstrate that somebody should take a retail CBD oil before giving a wedding speech, business presentation or interview.

The study with 150mg, 300mg and 600mg CBD

A later double-blind experiment provides an even more interesting result.

Researchers studied 57 healthy men and gave them either 150mg CBD, 300mg CBD, 600mg CBD or placebo before a simulated public-speaking test. View the study on PubMed.

If CBD simply became more effective as the dose increased, you might expect the 600mg group to produce the strongest result.

That isn't what happened.

The researchers found a statistically significant reduction in the measured anxiety response with 300mg CBD, while neither 150mg nor 600mg produced a significant difference from placebo on that anxiety measure.

The authors described this as an inverted U-shaped dose-response.

This is particularly useful when judging CBD marketing because it shows why claims such as “higher strength means more anxiety relief” cannot be inferred from this research.

In this experiment, more CBD was not automatically better.

Does the 300mg result mean 300mg is the ideal amount for public speaking?

No.

A research dose used under controlled experimental conditions is not a consumer dosage recommendation.

The 300mg result came from one relatively small study involving healthy male volunteers completing a simulated speech. The result would need to be considered alongside other research and replicated across different populations and settings before strong conclusions could be drawn.

It is therefore inappropriate to turn the study into advice such as:

“Take 300mg before a speech.”

It would be equally inappropriate to calculate how many drops of a particular CBD oil would provide the research dose.

Research doses are very different from current UK CBD guidance

This is one of the most important facts for UK consumers.

The public-speaking studies discussed above used hundreds of milligrams of CBD.

The Food Standards Agency currently advises healthy adults consuming CBD foods to limit their intake to 10mg of CBD per day. The FSA also advises that under-18s, people who are pregnant, breastfeeding or trying to conceive, and people taking medication should avoid CBD unless appropriately medically directed. Read the FSA guidance.

The difference between a 300mg or 600mg experimental dose and the FSA's 10mg daily advice is therefore substantial.

A scientific experiment investigating what CBD does at 300mg does not create a recommendation for consumers to take that amount.

Does CBD treat stage fright or public-speaking anxiety?

The available research does not justify saying that an ordinary CBD food product treats stage fright, social anxiety or public-speaking anxiety.

There are human experiments worth investigating further, but small experimental trials and mixed dose-response findings are not the same thing as established treatment evidence.

There is also an important UK regulatory distinction.

The FSA states that CBD foods are not medicines and that there are currently no authorised health claims for CBD food products. Claims that CBD foods relieve pain, improve sleep or treat conditions such as anxiety are not permitted.

The MHRA separately states that a CBD-containing product marketed for a medical purpose or using medicinal claims can fall within medicines regulation. Read the MHRA statement.

That is why responsible discussion of CBD and public-speaking research should describe what researchers found, rather than promising what a CBD oil will do for the person reading the article.

What about claims that CBD works through serotonin or GABA?

You will often see very confident explanations online stating that CBD stops public-speaking anxiety because it activates a particular serotonin receptor, boosts GABA or “switches off” the fight-or-flight response.

That goes further than the evidence allows.

Laboratory and mechanistic research can help scientists understand how CBD might produce particular effects, but knowing that a substance interacts with a biological pathway does not prove that a consumer product treats a health condition.

Mechanisms are useful for forming hypotheses. They are not substitutes for good clinical evidence.

This is one reason we prefer to separate discussion of CBD's underlying biology into our Endocannabinoid System guide, rather than using receptor science to make a retail product sound like a treatment.

Does high-strength CBD work better for public speaking?

There is no good basis for making that claim.

In fact, the 150mg/300mg/600mg experiment is a useful warning against assuming that greater CBD exposure automatically produces a greater effect. Only the middle dose produced the significant anxiety result in that particular study.

The strength printed on a CBD oil bottle tells you its concentration.

It does not tell you that the product will be more effective for anxiety, public speaking or any other health condition.

A high-strength CBD oil can simply deliver a given quantity of CBD in a smaller volume of carrier oil.

That distinction is important when comparing CBD products.

Public-speaking anxiety versus an anxiety disorder

Being nervous before a major presentation is not necessarily evidence of an anxiety disorder.

Situational nerves can occur because an event matters to us and because we know other people are evaluating our performance.

Persistent or severe anxiety that substantially interferes with everyday life is different and deserves appropriate professional support.

Our broader CBD and Anxiety UK: What Does the Research Show? article examines the wider human evidence surrounding CBD and anxiety disorders rather than duplicating it here.

Keeping the subjects separate also gives each guide a clearer purpose: this article examines public-speaking experiments, while the main Anxiety guide examines the broader clinical evidence.

What can we actually conclude from the research?

The simulated public-speaking experiments are interesting evidence that CBD deserves further investigation.

One small study involving people with social anxiety disorder reported favourable results after 600mg CBD. Another study involving 57 healthy men found an effect with 300mg but not with either 150mg or 600mg.

Those findings also highlight the limitations.

Participant numbers were relatively small, doses varied dramatically, experimental speeches do not reproduce every real-world situation, and research doses greatly exceed the current FSA daily intake advice for CBD foods.

The appropriate conclusion is therefore not:

“CBD works for stage fright.”

A more accurate conclusion is:

Human public-speaking studies have produced some interesting results, but considerably more evidence is needed before those findings can be translated into treatment or consumer recommendations.

Frequently asked questions

Has CBD actually been studied for public-speaking anxiety?

Yes. Human researchers have used simulated public-speaking tests to investigate CBD, including studies using 150mg, 300mg and 600mg doses. Some results have been positive, but the studies are relatively small and should not be interpreted as proof that retail CBD oil treats public-speaking anxiety.

What CBD dose worked in the public-speaking studies?

Different studies produced different findings. A 2011 study used 600mg in participants with social anxiety disorder. A later study found a significant anxiety result with 300mg, but not with 150mg or 600mg. These were research doses, not consumer dosage recommendations.

Should I take 300mg of CBD before a presentation?

The study should not be interpreted that way. The current FSA advice for healthy adults consuming CBD foods is a maximum of 10mg per day, far below the doses used in these public-speaking experiments.

Does stronger CBD work better for anxiety?

The public-speaking evidence does not support that assumption. In the study comparing 150mg, 300mg and 600mg, only the 300mg group showed the significant anxiety result measured by the researchers.

Can CBD oil be advertised as a treatment for stage fright?

An ordinary CBD food product should not be marketed as treating anxiety or stage fright. The FSA says CBD foods have no authorised health claims, while medicinal claims can also bring a CBD product within medicines regulation.

The bottom line

CBD and public-speaking anxiety is an unusually interesting research area because researchers have actually tested cannabidiol during simulated speeches in humans.

Some results justify further study.

They do not, however, establish that ordinary CBD oils treat public-speaking anxiety, nor do they provide instructions about what somebody should take before a presentation.

The most interesting lesson may actually be how careful we need to be with CBD research: different doses have produced different results, experimental conditions matter, and the doses used by researchers bear little resemblance to current UK consumer guidance.

For a wider examination of anxiety research rather than public speaking specifically, read our CBD and Anxiety UK: What Does the Research Show? guide.