A controlled substance is a drug whose manufacture, possession, and use are regulated by government under controlled-substance law; kratom is not a federally controlled substance. Federally, kratom remains legal even though it is not approved by the FDA.
A handful of states and some local jurisdictions have independently classified or banned kratom, which is why legality must be checked state by state. See the Kratom Legality hub and Schedule I.
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Disclaimer: This glossary entry is for educational purposes only and is not intended as medical, legal,
or professional advice. Kratom is not approved by the FDA to diagnose, treat, cure, or prevent any disease.