Substance guides

How long does kratom stay in your system?

Published January 15, 2026 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Kratom's primary alkaloid mitragynine has a half-life of approximately 23 hours, meaning it stays in the body longer than many people expect.

Detection

Urine: specialized kratom/mitragynine tests can detect use for 5-7 days. Standard drug panels do NOT detect kratom. Blood: 2-3 days. Hair testing for kratom exists but is uncommon. Saliva testing is not standardized.

Testing reality

Most workplace and treatment drug tests do not include kratom. However, some specialized panels and forensic tests can detect mitragynine and its metabolites. Military and some government testing may include kratom.

Factors

Chronic heavy use extends detection due to accumulation. Liver function, body fat, hydration, and individual metabolism affect clearance. Kratom combined with other substances may alter metabolism of both.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

Does kratom show up on a drug test?

Not on standard panels. Specialized kratom/mitragynine tests exist but are not commonly used in workplace or treatment screening.

How long does kratom stay in urine?

5-7 days with specialized testing. Standard drug panels will not detect kratom at all.

Is kratom legal?

Kratom is legal at the federal level but banned or regulated in several states and municipalities. Check your local laws.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.