What the evidence says. Graded mixed: the best-designed objective trial (polysomnography, insomnia) missed its primary endpoint, and positive signals are mostly subjective or in combination products — so the popular 'sleep cannabinoid' reputation outruns the human data. (Mixed evidence: Conflicting results across studies; benefit uncertain.)
What is CBN (Cannabinol)?
CBN (Cannabinol) is a sleep and mood supplement used for marketed sleep aid. NutriDex grades the human evidence as Mixed. Cannabinol (CBN) is a mildly sedating, non-intoxicating breakdown product of THC, heavily marketed as a natural sleep aid. The strongest objective test — a randomized polysomnography crossover in 20 insomnia patients — found that single 30 mg and 300 mg doses did NOT significantly reduce wake-after-sleep-onset (the primary outcome), though 300 mg modestly shortened sleep onset latency (p=0.004) and improved subjective sleep quality (p=0.005). A 293-person home trial of 20 mg CBN ± CBD found only a non-significant trend for sleep quality (p=0.082) but did cut nighttime awakenings and disturbance. A large industry trial of 25–100 mg CBN beat placebo on a sleep-disturbance scale, matching 4 mg melatonin, yet no dose differed from placebo on the clinically important threshold. A 2025 meta-analysis found non-CBD cannabinoids improved subjective sleep (SMD 0.53). Net: plausible mild benefit, but mixed and mostly subjective.
Purported Benefits
✓Marketed sleep aid
✓May ease nighttime awakenings
✓Mild, non-intoxicating relaxant
✓Possible adjunct for pain (in combos)
Evidence by outcome
The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.
Most sleep trials used 20–100 mg oral CBN at night (one study used 300 mg); no consensus effective dose is established.
Active Compounds
Cannabinol (CBN)Active metabolite 11-OH-CBN
Safety & Cautions
⚠
Short trials report CBN is generally well tolerated; common effects are next-morning grogginess, headache, altered taste and sleepiness, with safety established only up to ~7 days. Because CBN is metabolized by liver CYP450 enzymes, it can theoretically interact with drugs sharing that pathway and may add to the sedation of alcohol, benzodiazepines, opioids, sedating antihistamines and other CNS depressants. CBN can trigger a positive THC urine screen. Avoid in pregnancy and breastfeeding (untested), and treat hemp-derived products cautiously as potency and purity are poorly regulated. Educational only — always check with your doctor or pharmacist before combining CBN (Cannabinol) with any medicine.
CBN (Cannabinol) is most often taken for Marketed sleep aid, May ease nighttime awakenings, Mild, non-intoxicating relaxant, Possible adjunct for pain (in combos). The "sleep cannabinoid" — popular hype, thin human proof.
Does CBN (Cannabinol) work — what does the evidence say?
Mixed evidence. Conflicting results across studies; benefit uncertain. Cannabinol (CBN) is a mildly sedating, non-intoxicating breakdown product of THC, heavily marketed as a natural sleep aid. The strongest objective test — a randomized polysomnography crossover in 20 insomnia patients — found that single 30 mg and 300 mg doses did NOT significantly reduce wake-after-sleep-onset (the primary outcome), though 300 mg modestly shortened sleep onset latency (p=0.004) and improved subjective sleep quality (p=0.005). A 293-person home trial of 20 mg CBN ± CBD found only a non-significant trend for sleep quality (p=0.082) but did cut nighttime awakenings and disturbance. A large industry trial of 25–100 mg CBN beat placebo on a sleep-disturbance scale, matching 4 mg melatonin, yet no dose differed from placebo on the clinically important threshold. A 2025 meta-analysis found non-CBD cannabinoids improved subjective sleep (SMD 0.53). Net: plausible mild benefit, but mixed and mostly subjective.
What is the typical dose of CBN (Cannabinol)?
Most sleep trials used 20–100 mg oral CBN at night (one study used 300 mg); no consensus effective dose is established.
Is CBN (Cannabinol) safe? Any cautions or side effects?
Short trials report CBN is generally well tolerated; common effects are next-morning grogginess, headache, altered taste and sleepiness, with safety established only up to ~7 days. Because CBN is metabolized by liver CYP450 enzymes, it can theoretically interact with drugs sharing that pathway and may add to the sedation of alcohol, benzodiazepines, opioids, sedating antihistamines and other CNS depressants. CBN can trigger a positive THC urine screen. Avoid in pregnancy and breastfeeding (untested), and treat hemp-derived products cautiously as potency and purity are poorly regulated.
How many studies support CBN (Cannabinol)?
NutriDex cites 10 sources for CBN (Cannabinol), graded "Mixed".
Cite this page
APA
Peh, D. (2026). CBN (Cannabinol): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/cbn
BibTeX
@misc{nutridex_cbn,
author = {Peh, Daryl},
title = {CBN (Cannabinol): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/cbn},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.