Last updated: October 2026
CBD and CBN are both cannabinoids, but CBN forms as THC ages and is marketed mainly for sleep, while CBD is non-intoxicating and widely used day and night. In the UK the difference that matters most is legal: CBN is a controlled Class B drug, while CBD is legal in food supplements that meet the rules.
Below: a side-by-side comparison, what the sleep research shows, UK law, safety, and what to choose instead.
CBD vs CBN at a glance
| CBD (cannabidiol) | CBN (cannabinol) | |
|---|---|---|
| Where it comes from | Made by the hemp plant | Forms when THC breaks down with age, heat and light |
| Intoxicating? | No | Very mildly, much weaker than THC |
| Main use | Daily routine, evening wind-down | Marketed for sleep |
| Human research | Many trials, mostly at high doses | A handful of small trials |
| UK legal status | Legal in compliant food supplements | Controlled Class B drug |
What is CBN?
Cannabinol was the first cannabinoid ever isolated, in the 1890s. Fresh plants contain very little; it builds up as THC oxidises, which is why old cannabis has more of it. CBN acts weakly on the same CB1 receptors as THC, so at high doses it may have mild effects that CBD doesn’t. For other lesser-known cannabinoids, see minor cannabinoids explained.
Does CBN help sleep? The research
| Study | What it found |
|---|---|
| US trial, 2024 (293 poor sleepers, 7 nights) | 20mg CBN reduced night-time awakenings and overall sleep disturbance compared with placebo, but not time to fall asleep. Adding CBD didn’t improve results |
| Insomnia trial, 2026 (20 adults, sleep lab) | Neither 30mg nor 300mg changed time awake during the night (the main measure). 300mg helped people fall asleep faster and rate their sleep better |
| US trial, 2024 (1,793 adults, 4 weeks) | All CBD, CBN and melatonin products improved sleep, with small differences between them and no placebo group |
The evidence is early, mixed and mostly from studies funded by industry. CBN isn’t proven to help sleep, and it isn’t available legally in the UK in any case. For what is known about CBD and sleep, see CBD for sleep.
Is CBN legal in the UK?
No. Cannabinol and its derivatives are listed as Class B drugs under the Misuse of Drugs Act 1971, alongside cannabis. CBD products sold in the UK may contain only tiny trace amounts of controlled cannabinoids like THC and CBN, within strict limits. A product marketed as “CBN oil” or “CBN gummies” for sleep is very unlikely to be legal here.
CBD itself isn’t controlled, and CBD food products must be linked to an application on the FSA’s public list. See is CBD legal in the UK?
Safety and side effects
- CBD: generally well tolerated; drowsiness, diarrhoea and liver enzyme rises at high doses. See CBD side effects.
- CBN: little long-term safety data. As it acts on CB1 receptors, high doses may cause mild intoxication, and it could show on some drug tests. See CBD and drug tests.
- Both can interact with medicines. Ask a pharmacist. See CBD and medication.
What to use instead in the UK
If you’re looking at CBN for sleep, legal options include a broad spectrum CBD oil as part of an evening routine, magnesium, and good sleep habits. Melatonin is prescription-only in the UK. See melatonin in the UK and natural sleep aids.
Our Sleep CBD Oil combines broad spectrum CBD with passion flower. 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.
See also the best CBD oil for sleep in the UK (no CBN needed).
FAQs
What is the difference between CBD and CBN?
CBD is made by the hemp plant and isn’t intoxicating. CBN forms as THC ages, is very mildly intoxicating, and is a controlled drug in the UK.
Is CBN better than CBD for sleep?
There’s no clear evidence either way. CBN trials are few and mixed, and CBN isn’t legal to buy in the UK.
Is CBN legal in the UK?
No. Cannabinol is a Class B drug under the Misuse of Drugs Act 1971. Legal CBD products can contain only tiny traces.
Does CBN get you high?
It’s far weaker than THC, but it acts on the same receptors and may have mild effects at high doses.
Can you take CBD and CBN together?
In a 2024 trial, adding CBD to CBN didn’t improve sleep. In the UK, CBN products aren’t legal anyway.
Will CBN show up on a drug test?
It may, as some tests detect cannabinoids related to THC. Products containing CBN may also contain THC.
Sources
- Bonn-Miller MO et al. A double-blind, randomized, placebo-controlled study of CBN with and without CBD on sleep quality. Exp Clin Psychopharmacol, 2024.
- Lavender IG et al. Cannabinol for acute treatment of insomnia disorder in a randomized placebo-controlled crossover trial. J Sleep Res, 2026.
- Saleska JL et al. The safety and comparative effectiveness of non-psychoactive cannabinoid formulations for sleep. J Am Nutr Assoc, 2024.
- legislation.gov.uk. Misuse of Drugs Act 1971, Schedule 2.
