Delta-9-THC
Also known as: Δ9-THC, delta-9-tetrahydrocannabinol, THC, dronabinol
Effective Dosage
No established dose for supplements; clinical doses vary widely by route and condition
What the Science Says
Delta-9-THC is the primary psychoactive compound in cannabis. It works by partially activating cannabinoid receptors (CB1) throughout the brain and body. Clinical trials show it can reduce chronic neuropathic pain at low inhaled doses (0.5–1 mg), and a combination formula showed meaningful improvement in Tourette's syndrome tic symptoms over 12 weeks. It also affects the endocannabinoid system by influencing levels of naturally occurring compounds like anandamide, though these effects appear modest compared to CBD.
What It Doesn't Do
Won't treat cancer — computer simulations showing it might block tumor proteins are not human evidence. Not proven safe as a daily supplement — it's a controlled psychoactive drug, not a wellness ingredient. Won't improve motor skills or reaction time — studies show it reliably impairs fine motor control and timing. Not a substitute for established pain medications without medical supervision. No evidence it improves mental health on its own at supplement doses.
Evidence-Based Benefits
Delta-9-THC is the primary psychoactive compound in cannabis. It works by partially activating cannabinoid receptors (CB1) throughout the brain and body. Clinical trials show it can reduce chronic neuropathic pain at low inhaled doses (0.5–1 mg), and a combination formula showed meaningful improvement in Tourette's syndrome tic symptoms over 12 weeks. It also affects the endocannabinoid system by influencing levels of naturally occurring compounds like anandamide, though these effects appear modest compared to CBD.
Moderate EvidenceEffective at: No established dose for supplements; clinical doses vary widely by route and condition
Source: auto-research
Absorption & Bioavailability
Highly variable. Inhaled THC absorbs rapidly with fast onset. Oral absorption is slow and inconsistent due to first-pass metabolism. IV administration provides precise dosing but is not a consumer route. Route of administration dramatically changes how much reaches the bloodstream.
Red Flags to Watch For
- Delta-9-THC is a federally controlled substance in the US; its presence in over-the-counter supplements raises serious legal and safety concerns
- Causes dose-dependent impairment of fine motor control and motor timing — dangerous for driving or operating machinery
- Products labeled as containing THC analogs often contain undisclosed synthetic or semisynthetic compounds not listed on the label
- Psychoactive effects make blinding in clinical trials difficult, inflating apparent efficacy in uncontrolled studies
- Toxicology data in animals shows adverse clinical signs at oral doses, raising questions about safety of repeated oral use
- Vaped high-concentration THC liquid products carry unknown risks and no established human pharmacokinetic safety profile
Products Containing Delta-9-THC
See how Delta-9-THC is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-10