Last updated: October 2026
CBD may help some people feel calmer, but the evidence is still early. Small controlled studies found a single 300 to 600mg dose reduced anxiety before public speaking, far more than most supplements provide. Bigger, longer trials are needed. CBD is not a treatment for anxiety disorders, and it shouldn’t replace therapy or prescribed medicine.
This guide looks honestly at what the research shows, how CBD might work, why study doses differ from everyday use, and how to try it sensibly if you want to.
What is anxiety?
Anxiety is a feeling of unease, such as worry or fear, that can be mild or severe. Everyone feels anxious at times, for example before an exam or a job interview. For some people it becomes hard to control and starts to affect daily life. Generalised anxiety disorder (GAD) is a long-term condition where you feel anxious about a wide range of situations rather than one specific event.
Common emotional signs include restlessness, worry and trouble concentrating. Physical signs can include a racing heart, shaking, sweating, tense muscles, stomach upsets and poor sleep. The NHS recommends talking therapies, medicines and self-help as the main treatments.
Does CBD work for anxiety?
The honest answer is: possibly, for some people, but it is not proven. Short-term controlled studies are promising, and many people report feeling calmer and less reactive when they take CBD regularly. But most studies are small, many used doses far higher than supplements contain, and the one trial testing CBD alongside therapy in hard-to-treat anxiety found no extra benefit.
So it is reasonable to think of CBD as something some people find helpful for everyday stress, not as a treatment for an anxiety disorder. CBD sold as a food supplement in the UK isn’t licensed as a medicine, and it can’t be marketed to treat any condition.
What the research shows
| Study | Who | CBD dose | What happened |
|---|---|---|---|
| Bergamaschi, 2011 (controlled) | 24 people with social anxiety, never treated | 600mg, single dose | Less anxiety and discomfort during a public speaking test than placebo, similar to people without anxiety |
| Linares, 2019 (controlled) | 57 healthy men | 150, 300 or 600mg, single dose | Only 300mg reduced anxiety while speaking. 150mg and 600mg did no better than placebo |
| Masataka, 2019 (controlled) | 37 Japanese 18 and 19 year olds with social anxiety | 300mg daily for 4 weeks | Lower social anxiety scores than placebo |
| Shannon, 2019 (case series, no placebo) | 72 adults at a US psychiatric clinic | Mostly 25mg a day, alongside usual care | Anxiety scores fell within the first month in 57 people (79%) and stayed lower |
| Kwee, 2022 (controlled) | About 80 adults with hard-to-treat social anxiety or panic disorder | 300mg before each of 8 therapy sessions | No extra benefit over placebo when added to exposure therapy |
A 2015 review of animal, human and population studies concluded that CBD has real potential for anxiety, but that human evidence was mostly limited to single doses and few studies had looked at people with diagnosed anxiety disorders. That is still broadly true today.
Two points stand out. First, more is not always better: in the Linares study, the middle dose worked and the highest did not. Second, the strongest results come from short-term “stress test” studies, not long-term daily use.
Study doses vs supplement doses
Most controlled anxiety studies used 300 to 600mg of CBD in one go. A typical CBD supplement serving is 10 to 40mg, and the FSA advises healthy adults to take no more than 10mg a day. The NHS notes that shop-bought CBD products tend to contain small amounts, so their effect isn’t clear.
That doesn’t mean lower amounts do nothing. In the Shannon case series most people took 25mg a day, and many customers tell us they notice a difference at everyday amounts. But you can’t assume a 10mg serving will match the effects seen in a 300mg study.
The FSA’s 10mg a day figure is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication. Our CBD dosage guide shows how many drops make 10mg in each of our oils.
How CBD might work
Scientists don’t fully understand how CBD affects anxiety, but there are three main ideas:
- The endocannabinoid system. This network of receptors and messengers helps regulate mood, stress and sleep. CBD appears to slow the breakdown of anandamide, one of the body’s own cannabinoids, so it may stay active for longer.
- Serotonin receptors. CBD activates 5-HT1A receptors in lab studies, the same family of receptors involved in mood and some anti-anxiety medicines.
- The stress response. Brain imaging studies suggest single doses of CBD change activity in areas that process fear, such as the amygdala.
Unlike THC, CBD doesn’t make you high. Read more in does CBD affect your brain?
Which type of CBD?
| Type | What it contains | Good to know |
|---|---|---|
| Broad spectrum | CBD plus other hemp compounds such as terpenes, with THC removed | A popular middle ground; no THC |
| Full spectrum | All hemp compounds, including trace THC | THC is a controlled drug in the UK, and can show up in drug tests |
| Isolate | CBD only | Simplest, with nothing else added |
Some people believe the other hemp compounds work together with CBD (the “entourage effect”), but this hasn’t been properly tested for anxiety. All Evopure CBD products are broad spectrum with 0% THC. See full vs broad spectrum and types of CBD explained.
How to take CBD for anxiety
- Drops under the tongue. Hold for about 60 seconds, then swallow. Usually felt within 15 to 45 minutes, and easy to adjust drop by drop.
- Capsules. A fixed dose with no taste. Slower to work, often 1 to 2 hours, but simple to take at the same time every day.
- Edibles and drinks. Enjoyable but slow, and less is absorbed.
- Balms. Not thought to affect anxiety itself, but some people like them as part of a massage for tight shoulders or a tense jaw.
Start low, around 10mg a day, and give it two to four weeks of daily use before deciding whether it helps. Take it at the time of day your anxiety is worst: many people prefer the morning for daytime stress and the evening for a busy mind at night. Read how to take CBD oil, CBD oil vs capsules and when to take CBD oil.
If you are choosing a product, our best CBD oil for anxiety buyer’s guide explains what to look for and suggests day and night routines.
What to realistically expect
People who find CBD helpful usually describe a subtle change rather than a dramatic one: feeling a little less on edge, less reactive to small stresses, and able to switch off more easily at night. It works best alongside the basics that have stronger evidence: regular exercise, enough sleep, less caffeine and alcohol, and talking to someone.
If you notice no difference after a month of daily use, CBD may simply not be right for you. Other options some people explore include magnesium, L-theanine, ashwagandha and reishi.
Side effects, medicines and panic
CBD is generally well tolerated. Possible side effects include tiredness, diarrhoea, changes in appetite and a dry mouth, mostly at higher amounts.
Medicines. CBD affects liver enzymes that process many medicines, including some antidepressants, anti-anxiety medicines and blood thinners. Speak to your GP or pharmacist first if you take any regular medication, especially one with a grapefruit warning. See the grapefruit warning explained.
Can CBD cause panic attacks? CBD isn’t known to cause panic attacks, and it doesn’t make you high. THC, the intoxicating compound in cannabis, can trigger anxiety and paranoia in some people, which is one more reason to choose a THC-free product. A small number of people feel uncomfortable on CBD, so start low. If you notice a racing heart, read can CBD cause palpitations?
Don’t use CBD if you are pregnant, breastfeeding or under 18. See CBD side effects for more.
When to see your GP
See a GP if anxiety is affecting your daily life, work or relationships, or if it is causing you distress. In England you can also refer yourself to NHS Talking Therapies without seeing a GP. Never stop or change prescribed medicine without medical advice.
If you are having panic attacks you can’t manage, or thoughts of harming yourself, get help now: call NHS 111, call Samaritans free on 116 123, or call 999 in an emergency.
Related guides
- See anxiety symptoms for the full list of signs.
- See social anxiety: signs and how to cope.
- See how to deal with anxiety.
- CBD oil and sex: the honest evidence.
FAQs
Does CBD actually work for anxiety?
Possibly, for some people. Small controlled studies found single 300 to 600mg doses reduced anxiety during public speaking tests, but long-term evidence is limited. CBD isn’t a proven treatment for anxiety disorders.
How long does CBD take to work for anxiety?
Drops under the tongue are usually felt within 15 to 45 minutes and capsules within 1 to 2 hours. Give daily use two to four weeks before judging whether it helps you.
How much CBD should I take for anxiety?
There is no set dose. Start around 10mg a day and increase slowly if needed. The FSA advises healthy adults to take no more than 10mg a day as a precaution; check with your GP or pharmacist if you take medication.
Can CBD replace my anxiety medication?
No. CBD is not a medicine and should not replace prescribed treatment or therapy. Never stop or change medication without speaking to your doctor.
Can CBD make anxiety worse?
Most people don’t find this, but a small number feel uncomfortable, especially at higher amounts. THC, not CBD, is more likely to cause anxiety, so choose a THC-free product and start low.
Is CBD or ashwagandha better for anxiety?
They are different. Ashwagandha has more controlled trials for everyday stress, while CBD research focuses on short-term anxiety. Some people take both; check the cautions for each first.
Is it legal to take CBD for anxiety in the UK?
Yes. CBD food supplements are legal in the UK if they contain no controlled cannabinoids such as THC and are on the FSA public list. They can’t be sold as a treatment for anxiety.
Sources
- NHS. Generalised anxiety disorder in adults.
- NHS. Medical cannabis (and cannabis oils).
- NHS. NHS Talking Therapies.
- Food Standards Agency. Cannabidiol (CBD): consumer advice.
- Bergamaschi MM et al (2011). Cannabidiol reduces the anxiety induced by simulated public speaking in treatment-naive social phobia patients. Neuropsychopharmacology.
- Linares IM et al (2019). Cannabidiol presents an inverted U-shaped dose-response curve in a simulated public speaking test. Brazilian Journal of Psychiatry.
- Masataka N (2019). Anxiolytic effects of repeated cannabidiol treatment in teenagers with social anxiety disorders. Frontiers in Psychology.
- Shannon S et al (2019). Cannabidiol in anxiety and sleep: a large case series. The Permanente Journal.
- Kwee CM et al (2022). Cannabidiol enhancement of exposure therapy in treatment refractory patients with social anxiety disorder and panic disorder with agoraphobia. European Neuropsychopharmacology.
- Blessing EM et al (2015). Cannabidiol as a potential treatment for anxiety disorders. Neurotherapeutics.
This guide is general information, not medical advice. Evopure makes CBD products.
