Short answer

CBD capsules are pills that hold cannabidiol in oil or powder. You swallow them with water. Each capsule carries a set dose, so no dropper and no measuring. Onset runs 30 to 90 minutes. Effects last 4 to 6 hours. Oral bioavailability is low. Studies put it near 4 to 6 percent, because stomach acid and liver enzymes break down part of the dose before it reaches the blood.

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What sits inside a capsule

Labels list two forms. CBD isolate holds cannabidiol only. Full-spectrum oil keeps other hemp compounds, including trace THC at or under 0.3 percent dry weight under the 2018 Farm Bill. Shells come from gelatin or cellulose. Carrier oils include MCT coconut oil, olive oil, and hemp seed oil.

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Onset, peak, duration

Evidence by use

The strongest human data covers epilepsy. The FDA approved Epidiolex, a purified CBD oral solution, for Dravet syndrome and Lennox-Gastaut syndrome. Trials showed a drop in seizure frequency at doses of 10 to 20 mg per kg body weight per day.

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Data for anxiety, chronic pain, and sleep is thinner. Small trials report changes in anxiety scores. Many of those trials used single doses of 300 mg or more. Reviews note small sample sizes and short follow-up. Most retail capsule doses fall below the amounts used in those studies.

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Dose

Retail capsules hold 5 mg to 50 mg. Clinical trials use higher amounts, from 100 mg to 1,500 mg per day. No standard dose exists. Start low. Track the dose and the effect in a log.

Side effects and drug interactions

Reported effects include sleepiness, diarrhea, appetite change, and fatigue. Liver enzyme rises appear at high doses. CBD blocks CYP3A4 and CYP2C19, the enzymes that clear many drugs. Named cases include warfarin, clobazam, and valproate. Talk to a pharmacist before you combine CBD with a prescription drug.

Capsules compared with other forms

Capsules give a fixed dose and no taste. They act slower than vaped or sublingual oil. Vaping reaches blood in minutes. Sublingual drops reach blood in 15 to 30 minutes. Capsules last longer than both. Cost per milligram runs higher than oil in many stores.

What to check on a label