Kratom: The Opioid Supplement Hiding in Plain Sight

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Kratom (Mitragyna speciosa) is a Southeast Asian plant whose ground leaves are sold in the United States as a "botanical supplement." You will find it in capsules, powders, and shots at gas stations, convenience stores, smoke shops, and online. The marketing pitches it for energy, mood, and opioid withdrawal. What is usually missing from the label: kratom's two main alkaloids, mitragynine and 7-hydroxymitragynine, act on the same brain receptors as opioid drugs.

The Pharmacology

7-hydroxymitragynine (7-HMG) binds mu-opioid receptors with greater affinity than morphine in laboratory studies, and rats will self-administer it like an opioid. The effects you feel are dose-dependent in the same pattern as a classic opioid: pain relief at low doses, euphoria and sedation at higher doses, and breathing suppression at toxic doses. The DEA proposed Schedule I status for kratom's main alkaloids in 2016 but withdrew the proposal after public pushback. As of 2026, kratom is still federally legal, though the FDA lists it as a "drug of concern."

Dependence and Withdrawal

Physical dependence builds with regular use, often within a few weeks. Withdrawal — documented in hundreds of case reports and multiple observational studies — includes muscle aches, insomnia, anxiety, irritability, sweating, nausea, and cravings. The pattern looks like opioid withdrawal, though usually milder. The FDA has received thousands of adverse event reports tied to kratom, and the CDC has linked kratom to dozens of overdose deaths, most involving other drugs. Even when kratom alone is hard to isolate as the cause, the signal is real.

Poison Center Trends

U.S. poison centers logged 3,484 kratom-related calls between 2014 and 2019, with the rate climbing each year, according to American Association of Poison Control Centers (AAPCC) data. Reports include seizures, liver injury, and dozens of deaths in older adults whose cases involved drug interactions. Drug-induced liver injury cases tied to kratom have been published in hepatology journals on multiple continents.

Who Uses Kratom

Kratom has a real user community: people managing chronic pain, tapering off prescription opioids, and recreational users. Some users say it helps. For someone already dependent on opioids, kratom may be less harmful than illicit fentanyl. But that is a medical decision — one that belongs in a clinic with a doctor and a withdrawal plan, not in the checkout line at a gas station.

The Regulatory Gap

Because kratom is sold as a supplement rather than a drug, it skips the FDA approval process. Products vary widely in potency, can be contaminated, and have no required dosing standards. The American Kratom Association has lobbied to keep kratom unscheduled. Several states have passed a Kratom Consumer Protection Act that requires labeling and basic purity standards — a small step toward harm reduction, but it does not resolve the bigger safety questions.