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CBD (Cannabidiol)
A non-intoxicating cannabis compound: strong (prescription, high-dose) evidence for specific seizure disorders, but only promising-to-mixed evidence for the OTC wellness uses (anxiety, pain, sleep), plus notable drug interactions.
What the evidence says
Most CBD studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2017–2024 with a typical study size of 120 participants.
Based on 15 studies · 5 meta-analyses · 5 RCTs · 120 total participants
Confidence
HighBy outcome
CBD has an evidence score of 5.8/10 — moderate evidence based on 15 indexed studies, including 5 meta-analyses. A non-intoxicating cannabis compound: strong (prescription, high-dose) evidence for specific seizure disorders, but only promising-to-mixed evidence for the OTC wellness uses (anxiety, pain, sleep), plus notable drug interactions. Representative study: PMID 36206805.
The commonly studied dose of CBD is OTC wellness: 10-50mg/day (some anxiety studies used higher acute doses ~300mg); take with a fat-containing meal (increases absorption several-fold). Prescription Epidiolex for epilepsy is dosed by body weight under medical supervision.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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Last reviewed June 2026 · evidence from 15 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
CBD (cannabidiol) is a non-intoxicating compound from cannabis/hemp (it does not cause the 'high' that THC does). Its evidence is sharply two-tiered. As the prescription drug Epidiolex — at high, weight-based doses — it is FDA-approved and well-proven for rare seizure disorders (Dravet, Lennox-Gastaut, tuberous sclerosis). As an OTC wellness supplement at much lower doses, the evidence for anxiety is promising but limited, for chronic pain mixed, and for sleep weak (a controlled trial found 150mg nightly no better than placebo on sleep metrics). Importantly, CBD inhibits liver CYP enzymes (like grapefruit), can raise blood levels of many medications, and is associated with dose-dependent liver-enzyme elevations. OTC products are also poorly regulated, with frequently inaccurate labeled potency.
Indirectly influences CB1/CB2 signaling and raises endocannabinoid (anandamide) tone, affecting stress, pain, and inflammation.
Activates 5-HT1A receptors, a proposed basis for anxiolytic and some analgesic effects.
Acts on TRPV1 and inflammatory pathways implicated in pain and inflammation.
Reduces neuronal excitability (in part via GPR55 and calcium handling) — the basis of its proven anti-seizure effect at prescription doses.
OTC wellness: 10-50mg/day (some anxiety studies used higher acute doses ~300mg); take with a fat-containing meal (increases absorption several-fold). Prescription Epidiolex for epilepsy is dosed by body weight under medical supervision.
Take with food
| Form | Type |
|---|---|
| 💧CBD oil/tincture (third-party tested for potency and purity) | Recommended |
| 💊Softgel | Alternative |
| 🧴Topical | Alternative |
OTC potency is frequently mislabeled — choose products with a third-party Certificate of Analysis.
Minimum: 1 weeks
Optimal: 8 weeks
Cycling: Not required
Note: With a fat-containing meal; evening if used for its calming/sedating effect.
Dose-response data unavailable. The current published research for CBD does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
May ease anxiety; evidence promising but limited/mixed.
May reduce chronic/neuropathic pain in some people; results mixed.
At high prescription doses, reduces seizures in specific epilepsy syndromes.
Drowsiness and fatigue are common, especially at higher doses or with other sedatives.
GI upset, diarrhea, and appetite changes can occur.
Dose-dependent rises in liver enzymes, especially at high doses or with valproate.
Check with a pharmacist/clinician — CBD has grapefruit-like CYP drug interactions affecting many drugs.
Avoid — safety not established; FDA advises against CBD in pregnancy.
Avoid or use only with monitoring — dose-dependent liver-enzyme risk.
CBD raises clobazam levels via CYP2C19 — increased sedation/toxicity; needs dose adjustment.
CBD can raise warfarin levels (CYP2C9/3A4) — monitor INR closely.
Additive risk of liver-enzyme elevation/hepatotoxicity.
Tip: Lower dose; avoid with other sedatives; take in the evening
Tip: Reduce dose; take with food
Tip: Monitor
Tip: Avoid high doses and valproate; check liver enzymes if using high-dose long-term
The best time to take CBD is with meals. Take it with food. Taken with a fat-containing meal, which can increase CBD absorption ~4-5x.
CBD should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are somnolence/sedation, fatigue, diarrhea / GI upset, appetite/weight changes. Use caution if any of these apply to you: Concurrent use of CYP3A4/CYP2C19-metabolized drugs (incl. clobazam, some statins, blood thinners) without medical supervision; Liver disease or elevated liver enzymes; Pregnancy and breastfeeding.
Hydrolyzed peptides that rebuild skin elasticity, reduce joint pain, and strengthen bone density — results build over 8-12 weeks.
CBD inhibits these enzymes (grapefruit-like), raising drug levels.
Additive sedation/drowsiness.