Last updated: October 2026
CBD on its own hasn’t been shown to help migraines. In a 2026 placebo-controlled trial, inhaled CBD-dominant cannabis did no better than placebo for a migraine attack, while a THC and CBD mix did help. THC is illegal in UK supplements, so over-the-counter CBD isn’t comparable. Proven migraine treatments and riboflavin have better evidence.
Below: what the trials found, why THC matters, CBD and migraine medicines, and what helps migraines.
Does CBD help migraines? The trials
| Treatment (2026 US trial, 92 adults, 247 attacks) | Pain relief at 2 hours |
|---|---|
| THC plus CBD (inhaled) | 67% versus 47% on placebo: better than placebo |
| THC-dominant (inhaled) | 69% versus 47%: better for relief, not for becoming pain-free |
| CBD-dominant (inhaled) | Not better than placebo on any measure |
A 2026 review of cannabinoid trials for headache and back pain concluded the evidence doesn’t support a general benefit, and that results depend heavily on the product and on THC. There are no good trials of CBD oil taken by mouth to prevent migraines.
Why the THC matters
The positive results came from products containing THC, the intoxicating part of cannabis. In the UK, THC is a controlled drug: CBD supplements may only contain tiny traces, and medical cannabis isn’t licensed on the NHS for migraine. So the trial results don’t apply to the CBD oils you can buy. See medical cannabis in the UK and CBD vs THC.
CBD with migraine medicines
- Preventers such as amitriptyline, topiramate and propranolol, and some triptans, are processed by the liver. CBD can affect how some medicines are broken down. Ask a pharmacist. See CBD and medication.
- Drowsiness: CBD can add to the sleepiness some migraine medicines cause.
- Medication overuse headache: using painkillers on 10 or more days a month can make headaches worse. Speak to your GP if that’s you.
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.
What helps migraines
| Option | UK status |
|---|---|
| Painkillers and triptans for attacks | Recommended by NICE; from pharmacies or a GP |
| Preventers (propranolol, topiramate, amitriptyline) | NICE recommends discussing these if attacks are frequent |
| Riboflavin 400mg a day | NICE says it may reduce frequency and intensity for some people |
| Magnesium | Some trial evidence. See magnesium for migraines |
| Lifestyle | Regular sleep and meals, enough water, a headache diary to spot triggers |
Call 999 or go to A&E for a sudden, severe headache, or one with weakness, confusion, a stiff neck and fever, or after a head injury.
See also tension headaches.
FAQs
Does CBD help migraines?
Not on its own, as far as trials show. CBD-dominant cannabis did no better than placebo in a 2026 trial; products with THC did help.
Can CBD oil prevent migraines?
There are no good trials of CBD oil for migraine prevention. Riboflavin, magnesium and prescription preventers have better evidence.
Can I take CBD with sumatriptan?
Ask a pharmacist first. CBD can affect how some medicines are processed and may add to drowsiness.
Is medical cannabis available for migraines in the UK?
It isn’t licensed on the NHS for migraine. Some private clinics prescribe it, but evidence is still limited.
Does CBD help tension headaches?
There’s no good evidence. Regular sleep, hydration, posture and simple painkillers used sparingly help most people.
Sources
- Schuster NM et al. Vaporized cannabis versus placebo for acute migraine: a randomized, double-blind, placebo-controlled crossover trial. Headache, 2026.
- Costa-Oliveira CD et al. Efficacy and safety of cannabinoid-based interventions for low back pain and migraine: a systematic review. Cannabis Cannabinoid Res, 2026.
- NICE. Headaches in over 12s: diagnosis and management (CG150).
- NHS. Migraine.
