THC
Cannabis / delta-9 · Cannabinoid
What it is
The main psychoactive cannabinoid in cannabis. Shows up in this corner of the world for sleep, appetite, pain and recovery claims — and because so many people tracking their health are already using it and want to know what it does to the rest of their protocol.
What human evidence shows
Real evidence for chemotherapy nausea, some chronic-pain states, and spasticity in MS. For sleep — the common biohacker use — the picture is worse than assumed: it shortens sleep latency but suppresses REM, and rebound insomnia on stopping is well documented. For recovery/inflammation claims, human evidence is weak. Regular use measurably blunts motivation in a dose-dependent way in some users.
Risks
Dependence is real (~9% of users; higher starting young), and cannabis-use disorder is the most common reason people seek help for any illicit drug. Impaired driving, anxiety/paranoia at higher doses, cannabis hyperemesis syndrome with heavy chronic use, and in adolescents/young adults an association with psychosis in the predisposed. Smoked forms carry respiratory harm; unregulated vape carts have their own contamination history. On a tracked protocol: it confounds sleep data and appetite signals more than almost anything else people take.
Legal status
US: federally Schedule I, legal for adults in many states — the state/federal split is unresolved. Employment drug testing does not care what your state legalized.
Evidence base
established literature
Large human evidence base: several phase 3 or 4 trial reports, plus multiple meta-analyses or systematic reviews.
- phase 3/4
- 3
- randomised
- 506
- reviews
- 242
- human trials
- 704
Counts are of published papers, not distinct trials, and measure how much research exists — not whether this works or is safe for you.
Research (12)
- Tetrahydrocannabinol (THC)2026
- The Utility of THC Cutoff Levels in Blood and Saliva for Detection of Impaired DrivingCannabis Cannabinoid Res · 2023
- Delta-8-THC: Delta-9-THC's nicer younger sibling?J Cannabis Res · 2022
- Review of delta-8-tetrahydrocannabinol (Δ(8) -THC): Comparative pharmacology with Δ(9) -THCBr J Pharmacol · 2022
- "Residual blood THC levels in frequent cannabis users after over four hours of abstinence: A systematic review."Drug Alcohol Depend · 2020
- Mechanisms of Action and Pharmacokinetics of CannabisPerm J · 2020
- Recent advances in electrochemical sensor technologies for THC detection-a narrative reviewJ Cannabis Res · 2022
- Tolerability of High-Dose Oral Δ(9)-THC: Implications for Human Laboratory Study DesignCannabis Cannabinoid Res · 2024
- Toxicogenetic analysis of Δ9-THC-metabolizing enzymesInt J Legal Med · 2020
- Experimenter administered Δ(9)-THC decreases nicotine self-administration in a rat modelPharmacol Biochem Behav · 2023
- Commercial Delta-8 THC Products: an Analysis of Content and LabelingJ Med Toxicol · 2024
- THC and gabapentin interactions in a mouse neuropathic pain modelNeuropharmacology · 2019
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