HalfLifeDBEvidence before certainty.

THC evidence profile

THC is a good stress test for any simple calculator because distribution, metabolites, route, and repeat exposure can make one clean curve feel too tidy.

Category: cannabinoid · Updated: August 7, 2026

Sources and model notes are maintained by . This page is educational, not clinical guidance. Corrections: admin@halflifedb.co.

Model statusNo curve publishedCurrent sources do not support one defensible human input
Evidence boundarySource note onlyNo animal, forensic, mixture, or proxy value is presented as a human half-life
Model scopeNot modeledThe profile explains what the available records can and cannot establish
References4Linked studies, labels, reviews, or identity records described below
Key interpretation

What a careful reader should notice first

The chart is useful for seeing the selected parent-compound model, but cannabinoid interpretation often becomes complicated as soon as the question shifts toward duration, impairment, or testing.

Source angle

Read the cited sources with an eye for what was measured, how often exposure occurred, and whether the discussion is about parent THC or downstream metabolites.

Do not use it for

Do not collapse this page into a detection-window answer. Tissue distribution and metabolite testing can keep the practical question alive long after the simple curve has declined.

Best next step

Open the detection-window and active-metabolite guides before comparing THC with CBD or synthetic cannabinoid entries.

THC: evidence and interpretation notes

Why HalfLifeDB does not plot THC

THC follows multiphasic distribution and elimination, with route, exposure history, tissue redistribution, parent drug, and metabolites changing the answer. A single 25-hour line would be especially easy to misread as an impairment or testing clock.

The citations include cannabis metabolism/toxicology review material, a long-body-presence study, human cannabinoid pharmacokinetics, and the compound record.

Do not use this page to estimate impairment or drug-test timing.

What each source contributes

  • Sharma P et al. Chemistry, metabolism, and toxicology of cannabis (2012). This metabolism study identifies pathways, metabolites, or analytical targets and does not by itself create a complete human concentration-time curve.
  • Mørland J et al. Delta-9-THC is present in the body for a long time (2020). This supporting literature record adds compound-specific background and is used only within the limits of its design.
  • Huestis MA. Human cannabinoid pharmacokinetics (2007). This human pharmacokinetic record adds measured route, analyte, and population context and does not become a universal result.
  • PubChem: Delta-9-tetrahydrocannabinol. This identity record confirms names and compound identity and does not supply a human half-life.

For THC, the decision to withhold a curve turns on the limits visible in Sharma P et al. Chemistry, metabolism, and toxicology of cannabis (2012). This metabolism study identifies pathways, metabolites, or analytical targets, but it does not by itself create a complete human concentration-time curve.

What evidence would change the page

For THC, stronger evidence means more than detection or biological activity: it means a clearly reported human elimination estimate tied to one analyte and route. That numerical bridge is absent from Sharma P et al. Chemistry, metabolism, and toxicology of cannabis (2012).

InterpretationCategory context and evidence limits

cannabinoid context

Cannabinoid kinetics can be complicated by tissue distribution, metabolites, route, frequency of use, and long detection windows.

  • Detection windows are not the same as pharmacologic half-life.
  • Single-dose curves can understate complexity after repeated exposure.
  • Routes such as inhaled and oral use can produce different concentration-time profiles.
EvidenceSource trail and model decision

Sources and evidence context

A linked record is not automatically proof of the displayed value. Study, labeling, review, and compound identity sources serve different purposes; notes below identify limitations when they are known.

1 PubMed2 PMC0 DailyMed1 PubChem
  1. Full-text research Sharma P et al. Chemistry, metabolism, and toxicology of cannabis (2012).
    Metabolism-focused evidence used to identify pathways or analytes. It does not automatically establish a population half-life.
  2. Research abstract Mørland J et al. Delta-9-THC is present in the body for a long time (2020).
    Supporting literature record. Its role and study design should be read from the linked source before applying any numerical finding.
  3. Full-text research Huestis MA. Human cannabinoid pharmacokinetics (2007).
    Direct pharmacokinetic context. Population, route, formulation, analyte, and sampling duration still determine how broadly the result can be applied.
  4. Identity record PubChem Compound Summary: Delta-9-tetrahydrocannabinol.
    Compound identity and naming record. It supplies chemistry context, not independent numerical support for the model.
BoundariesWhat this page cannot answer and where to continue

What this page does not answer

  • It does not estimate impairment, intoxication, or fitness to drive.
  • It does not predict urine, blood, saliva, or hair test results.
  • It does not model repeated exposure, tolerance, withdrawal, or interactions.
  • It does not replace clinician, pharmacist, toxicologist, or emergency guidance.

Continue with context

Read the medical disclaimer, methodology, and research standards before using the model for comparison.