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The proportion of a consumed cannabinoid that actually enters the bloodstream and produces an active effect.
Bioavailability measures the percentage of a consumed cannabinoid that actually reaches the bloodstream and produces an active effect. Different consumption methods deliver cannabinoids to the body with dramatically different efficiency rates, which directly impacts how much you need to consume and how quickly you feel the effects.
Inhalation (smoking or vaporizing) offers the highest bioavailability for cannabis, typically 30% to 50%, with effects felt within minutes. Sublingual administration (tinctures under the tongue) provides roughly 20% to 35% bioavailability with onset in 15 to 30 minutes. Oral consumption (edibles and capsules) has the lowest bioavailability at approximately 6% to 20% because cannabinoids must pass through the digestive system and liver before reaching the bloodstream, a process called first-pass metabolism. Topical products work locally and generally do not enter systemic circulation, while transdermal patches are designed to cross the skin barrier for systemic delivery.
Understanding bioavailability helps consumers dose appropriately for each consumption method. A 10mg THC edible will feel very different from 10mg inhaled because your body absorbs different amounts. It also explains why edibles can feel more intense despite lower bioavailability: the liver converts delta-9 THC into 11-hydroxy-THC, which crosses the blood-brain barrier more readily and produces stronger psychoactive effects.
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