NutriDex

The Supplement Research Compendium
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CBD (Cannabidiol)

Non-intoxicating hemp compound; proven for rare epilepsy, hyped elsewhere.

Mixed evidence 🌙Sleep & Mood✨Joint & Skin

✚ Updated · How we grade evidence

Evidence tier
Mixed
Research weight
Citations
8 verified / 8
Classification
Sleep & Mood
❝
What the evidence says. Graded mixed: purified CBD is a proven, FDA-approved anticonvulsant for Dravet/Lennox-Gastaut/TSC, but for the consumer claims (sleep, pain, everyday anxiety) RCTs are small, heterogeneous and often null on primary endpoints — pure CBD failed to beat placebo for chronic/neuropathic pain. (Mixed evidence: Conflicting results across studies; benefit uncertain.)

What is CBD (Cannabidiol)?

CBD (Cannabidiol) is a sleep and mood supplement used for reduces seizures (rare epilepsy). NutriDex grades the human evidence as Mixed. Cannabidiol is a non-intoxicating cannabis compound. Its one rigorously proven use is as the prescription drug Epidiolex, which cut seizures in three randomized trials (n=516) for rare epilepsies and is FDA-approved. The over-the-counter wellness story is far weaker. A 2024 meta-analysis (8 trials, 316 people) found a sizeable anxiety benefit (Hedges' g -0.92), but trials were tiny, varied widely and some were null. For sleep, a 150 mg nightly RCT showed no change in insomnia severity, onset latency or wake-after-sleep versus placebo. For chronic and neuropathic pain, pure CBD did not outperform placebo in meta-analyses; only THC-containing products helped. OTC products also vary hugely in actual CBD content. So CBD is genuinely useful for specific seizure disorders but largely unproven at the low doses sold for sleep, pain and stress.

Purported Benefits

✓Reduces seizures (rare epilepsy)
✓May ease anxiety
✓Sleep & relaxation
✓Pain & inflammation (limited)

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.

OutcomeEvidenceEffectStudies
Seizures in rare epilepsyMultiple RCTs (FDA-approved Epidiolex) cut seizures in Dravet and Lennox-Gastaut syndromes. Strong ↑ benefit · large 2
Anxiety2024 meta-analysis found a large effect (g -0.92) but trials were tiny, heterogeneous and some null. Preliminary ↑ benefit · moderate 1
Sleep / insomnia150 mg nightly RCT showed no change in insomnia severity, onset latency or wake-after-sleep. Moderate — no effect · negligible 1
Chronic / neuropathic painPure CBD did not beat placebo in meta-analysis; only THC-containing products helped. Moderate — no effect · negligible 2
Liver enzyme elevation (harm)ALT/AST >3x ULN in ~13% of epilepsy patients vs 1% placebo; risk rises with valproate. Moderate ⚠ risk · moderate 1

Dosing & Compounds

Typical Dose
Wellness products typically supply 10–50 mg/day; prescription Epidiolex doses run 10–20 mg/kg/day, far higher than OTC oils.
Active Compounds
Cannabidiol (CBD)

Safety & Cautions

Generally well tolerated but not harmless: common effects are sleepiness, diarrhea, reduced appetite and fatigue, and high doses can raise liver enzymes (dose-dependent, worse with valproate). CBD inhibits CYP3A4, CYP2C9 and CYP2C19, so it can raise levels of clobazam, warfarin (bleeding risk), some antiepileptics, sedatives and other drugs — interactions become clinically relevant above ~300 mg/day. Avoid in pregnancy and breastfeeding, and consult a clinician if on anticoagulants, anticonvulsants or sedatives. OTC products are poorly regulated and often mislabeled, sometimes containing THC. Educational only — always check with your doctor or pharmacist before combining CBD (Cannabidiol) with any medicine.

Key Studies

Meta-analysis Han 2024 ✓ PubMed
Meta-analysis (8 trials, 316 patients): CBD reduced anxiety with large effect (Hedges' g -0.92, 95% CI -1.80 to -0.04); small samples.
Meta-analysis Mücke 2021 ✓ PubMed
Meta-analysis of neuropathic pain: CBD alone showed NO significant pain reduction vs placebo; only THC/THC-CBD helped.
Systematic review Villanueva 2022 ✓ PubMed
Systematic review (12 studies) of CBD for chronic pain: possible benefit but few trials, high heterogeneity, evidence judged limited.
RCT Narayan 2024 ✓ PubMed
150 mg CBD nightly for 2 weeks did NOT improve insomnia severity, sleep-onset latency or wake-after-sleep vs placebo (n=30 RCT).
RCT Devinsky 2017 (Dravet) ✓ PubMed
Epidiolex 20 mg/kg/day cut convulsive seizures from 12.4 to 5.9/month vs little change on placebo (n=120 RCT).
RCT Thiele 2018 (Lennox-Gastaut) ✓ PubMed
CBD reduced monthly drop-seizure frequency by ~44% vs 22% on placebo over 14 weeks (n=171 RCT).
Safety LiverTox (NIH) 2020 ✓ Full text
CBD raised ALT/AST >3x ULN in ~13% of epilepsy patients vs 1% placebo; risk rises with valproate co-use.
Safety Bonn-Miller 2017 ✓ PubMed
Of 84 online CBD products, ~43% were underlabeled and ~26% overlabeled for CBD content; THC detected in 21%.
8 sources cited · 8 verified Search all studies on PubMed ↗

Common questions about CBD (Cannabidiol)

What is CBD (Cannabidiol) used for?

CBD (Cannabidiol) is most often taken for Reduces seizures (rare epilepsy), May ease anxiety, Sleep & relaxation, Pain & inflammation (limited). Non-intoxicating hemp compound; proven for rare epilepsy, hyped elsewhere.

Does CBD (Cannabidiol) work — what does the evidence say?

Mixed evidence. Conflicting results across studies; benefit uncertain. Cannabidiol is a non-intoxicating cannabis compound. Its one rigorously proven use is as the prescription drug Epidiolex, which cut seizures in three randomized trials (n=516) for rare epilepsies and is FDA-approved. The over-the-counter wellness story is far weaker. A 2024 meta-analysis (8 trials, 316 people) found a sizeable anxiety benefit (Hedges' g -0.92), but trials were tiny, varied widely and some were null. For sleep, a 150 mg nightly RCT showed no change in insomnia severity, onset latency or wake-after-sleep versus placebo. For chronic and neuropathic pain, pure CBD did not outperform placebo in meta-analyses; only THC-containing products helped. OTC products also vary hugely in actual CBD content. So CBD is genuinely useful for specific seizure disorders but largely unproven at the low doses sold for sleep, pain and stress.

What is the typical dose of CBD (Cannabidiol)?

Wellness products typically supply 10–50 mg/day; prescription Epidiolex doses run 10–20 mg/kg/day, far higher than OTC oils.

Is CBD (Cannabidiol) safe? Any cautions or side effects?

Generally well tolerated but not harmless: common effects are sleepiness, diarrhea, reduced appetite and fatigue, and high doses can raise liver enzymes (dose-dependent, worse with valproate). CBD inhibits CYP3A4, CYP2C9 and CYP2C19, so it can raise levels of clobazam, warfarin (bleeding risk), some antiepileptics, sedatives and other drugs — interactions become clinically relevant above ~300 mg/day. Avoid in pregnancy and breastfeeding, and consult a clinician if on anticoagulants, anticonvulsants or sedatives. OTC products are poorly regulated and often mislabeled, sometimes containing THC.

How many studies support CBD (Cannabidiol)?

NutriDex cites 8 sources for CBD (Cannabidiol), graded "Mixed".

Cite this page
APA

Peh, D. (2026). CBD (Cannabidiol): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/cbd

BibTeX
@misc{nutridex_cbd,
  author       = {Peh, Daryl},
  title        = {CBD (Cannabidiol): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/cbd},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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