Kratom is a tropical tree native to Southeast Asia whose leaves contain compounds that act on opioid receptors in the brain. People use it for pain relief, energy, and to manage opioid withdrawal symptoms, but it carries real risks including dependence, liver damage, and seizures. It belongs to the same plant family as coffee, yet its effects more closely resemble those of opioids, especially at higher doses.
The tree grows naturally across a wide band of Asia, including Thailand, Malaysia, Indonesia, India, and the Philippines. In those regions, workers have chewed fresh kratom leaves for generations to fight fatigue during long days of manual labor. In the United States and other Western countries, kratom is sold as dried leaf powder, capsules, extracts, and tea bags.
How Kratom Works in the Body
Kratom leaves contain dozens of alkaloids, but two do most of the heavy lifting. Mitragynine makes up 1 to 2% of dried leaf weight and accounts for roughly two-thirds of the total alkaloid content. The second, 7-hydroxymitragynine, is present in much smaller amounts (less than 0.05% of dried leaf) but is far more potent.
These two compounds interact differently with the brain’s opioid system. Mitragynine has relatively low binding strength at the main opioid receptor and functions mostly as a weak activator. 7-hydroxymitragynine binds about nine times more tightly and acts as a partial activator of the same receptor, producing effects similar to traditional opioids like pain relief, sedation, and a sense of well-being. Mitragynine also binds to adrenergic receptors, which help regulate alertness and arousal. This dual action on different brain systems helps explain why kratom’s effects shift depending on the dose.
Stimulant at Low Doses, Sedative at High Doses
Kratom behaves like two different substances depending on how much you take. At low doses, roughly 1 to 5 grams of dried leaf, users report stimulant-like effects: increased energy, alertness, and sociability. At higher doses, between 5 and 15 grams, the opioid activity dominates. The experience shifts toward sedation, pain relief, and euphoria.
This dose-dependent split is unusual among psychoactive plants and is one reason kratom is difficult to classify. It also means that someone gradually increasing their dose can cross from one set of effects into a very different one without realizing the pharmacological shift that’s occurred.
Why People Use It
The most commonly cited reasons for using kratom are chronic pain, fatigue, anxiety, depression, and opioid withdrawal. Many people turn to it as a self-managed alternative when conventional treatments feel inadequate or inaccessible. In online communities, kratom is frequently described as a tool for tapering off prescription opioids or heroin.
The evidence behind these uses, however, remains thin. The Mayo Clinic notes that while people take kratom to ease opioid withdrawal, it hasn’t proved effective for that purpose. Research actually suggests that kratom use may itself lead to dependence and withdrawal rather than resolving them. No kratom product has been approved by the FDA to treat any medical condition.
How People Take It
In Southeast Asia, fresh leaves are chewed or brewed into a strong decoction. In the U.S., where fresh leaves aren’t available, dried powder is the most common form. People stir it into juice, pack it into capsules, or steep it as tea. Concentrated liquid extracts are also widely sold.
The preparation method meaningfully changes what you’re getting. When kratom is brewed as a simple tea infusion, the mitragynine content drops substantially compared to consuming the raw powder. One study found that tea bag infusions contained roughly one-fifth to one-quarter the mitragynine of a full chemical extraction. Users report that tea produces milder effects, which researchers have suggested may make it a relatively safer method of consumption compared to concentrated extracts or large amounts of powder.
Side Effects and Health Risks
Kratom’s opioid-like activity comes with opioid-like side effects. Common ones include nausea, vomiting, constipation, and sedation. More serious risks have prompted the FDA to warn consumers against using kratom entirely, citing liver toxicity, seizures, and the development of substance use disorder.
Dependence is a well-documented concern. People who use kratom regularly can develop tolerance, needing progressively larger amounts to feel the same effects. When they stop, withdrawal symptoms emerge, including muscle aches, irritability, insomnia, and cravings, mirroring the withdrawal pattern seen with traditional opioids. The FDA has also flagged cases of neonatal abstinence syndrome, where newborns showed withdrawal signs like jitteriness, irritability, and muscle stiffness after prolonged kratom exposure during pregnancy.
In rare cases, deaths have been associated with kratom use, confirmed by medical examiners or toxicology reports. Many of these cases involved other substances as well, making it difficult to isolate kratom’s role, but the risk is not zero.
Contamination Concerns
Because kratom is sold as an unregulated dietary ingredient, not a pharmaceutical product, there are no standardized manufacturing controls. The FDA has issued public warnings after kratom products were found contaminated with Salmonella bacteria and concerning levels of heavy metals like lead and nickel. Without consistent testing or labeling requirements, consumers have no reliable way to verify the purity or potency of what they’re buying. Two products from different brands, or even two batches from the same brand, can contain very different alkaloid concentrations.
Legal Status in the United States
Kratom is not scheduled as a controlled substance at the federal level, which means it is legal to buy and sell in most of the country. The DEA considered placing it on Schedule I in 2016 but withdrew the proposal after public backlash. Individual states, however, have moved independently. As of 2026, seven states have classified kratom or its active compounds as Schedule I controlled substances, with Connecticut being the most recent. Several cities and counties have enacted their own bans as well. The legal landscape varies enough that what’s legal in one state may carry criminal penalties in another.
Some states have taken a regulatory rather than prohibitory approach, passing versions of the Kratom Consumer Protection Act, which sets labeling standards, age restrictions, and limits on certain concentrated alkaloids rather than banning the plant outright.