The evidence for broad spectrum CBD as a sleep aid is limited. Small trials show mixed results. No CBD product is FDA-approved for insomnia. The FDA has approved one CBD drug, Epidiolex, for rare seizure disorders.
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What broad spectrum means
Broad spectrum CBD contains CBD plus other plant compounds such as cannabigerol, terpenes, and flavonoids. Labels list THC at 0.3% or less, or state THC is removed. Full spectrum products retain THC. Isolate contains CBD only.
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What trials show
A 2019 trial in the Permanente Journal gave 72 adults 25 mg of CBD in a capsule each day. Sleep scores improved in 66% of participants in the first month. The gain did not last into the second month. The study had no placebo group. A 2022 review found too few high-quality trials to set a dose for insomnia.
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Dose and timing
Trials use 25 mg to 300 mg per day. Labels on retail products suggest 10 mg to 50 mg. Oral products take 1 to 2 hours to reach peak blood levels. CBD half-life runs 18 to 32 hours with repeated use. Start with a low serving and log sleep for two weeks. Unknown: the dose that helps sleep for most adults.
Risks and interactions
CBD can raise blood levels of drugs processed by CYP2C19 and CYP3A4 enzymes. Examples: warfarin, clobazam, and some statins. Side effects in trials include diarrhea, fatigue, and sleepiness. High doses in the Epidiolex program caused liver enzyme rises.
Convenience and label accuracy
Retail forms include tinctures, capsules, gummies, and drinks. A 2017 JAMA study tested 84 products. 26% contained less CBD than the label stated. 43% contained more. Convenience raises a second issue: a gummy serving can differ from a dropper dose. Buy products with a batch lab test that lists cannabinoid content.
Bottom line
Broad spectrum CBD may help some people sleep. The data are thin. Check interactions with a pharmacist. Keep sleep habits in place: 7 to 9 hours in bed, a set wake time, and no caffeine after noon.