Kratom in Thailand: History, Culture, and Current Law

Evidence and law reviewed: July 15, 2026. This educational overview discusses human consumption, reported effects, dependence, and Thai law; it is not medical or legal advice.

Thailand is central to kratom history because Mitragyna speciosa grows there, people have consumed its fresh leaves for generations, Thai researchers have produced unusually detailed community studies, and the country has moved through two very different legal eras. Kratom was controlled for decades, removed from Thailand's narcotics list in 2021, and placed under a dedicated Kratom Plant Act in 2022.

That change is sometimes reduced to “kratom is legal in Thailand.” The current position is more specific. Adults can encounter lawful cultivation, possession, sale, and consumption of kratom, but the law protects certain groups, restricts places and methods of sale, controls import and export, prohibits dangerous mixtures, and sends foods, herbal products, drugs, cosmetics, extracts, advertising, and other finished products into their own regulatory systems.

What kratom is called in Thailand

The Thai name is commonly romanized as kratom or krathom. The plant itself is Mitragyna speciosa, a member of the coffee family, Rubiaceae. Thai botanical research records it in wet tropical environments, including lowland forest near streams and other moist sites. Southern Thailand has supplied much of the country's best documented social history because the tree and fresh-leaf use remained especially visible there.

A scientific name identifies the species; it does not turn every “Thai” product name into proof of origin. The botany and habitat guide to Mitragyna speciosa separates accepted plant identity from the geographic language used in modern catalogs.

Fresh-leaf use came before the modern product market

Thai community records describe people chewing fresh leaves and drinking water-based leaf preparations. Agricultural and other manual workers have reported consuming kratom for alertness, energy, stamina, reduced fatigue, and the ability to continue demanding work. Other reports include relaxation, pain relief, social use, and managing withdrawal from opioids or other substances. Depending on the person, material, amount, and pattern of use, effects have been described as stimulant-like or as sedating and opioid-like.

This history concerns a psychoactive plant people deliberately consumed for effects. It also concerns a particular form. A fresh leaf chewed in a village is not compositionally identical to dried powder, a capsule, a flavored gummy, a liquid shot, or a concentrated extract. The history of kratom before ecommerce follows the transition from local plant practice to formal botany, prohibition, research, and international commerce.

What the southern Thai interviews found

A 2013 qualitative study interviewed 34 men who identified as regular, occasional, former, or non-users in three rural villages in southern Thailand. The participants were 31 to 75 years old, and many worked in rubber, palm, rice, construction, or other physically demanding settings. Regular users described histories of consumption extending from several years to decades.

The interviews recorded why people continued to chew krathom, how they prepared and consumed it, the positive effects they perceived, and the negative effects they recognized. The authors concluded that kratom could produce addiction with characteristic signs and symptoms. That conclusion came from the same community record that documented valued work-related and social effects; the study did not require erasing one side to acknowledge the other.

Because the sample was small, male, rural, and selected through community contacts, it is not a national prevalence estimate. Its strength is detail: it shows what fresh-leaf use meant to the people interviewed and how effects, routine, availability, and dependence could coexist.

What the larger long-term study found

A later research program conducted community surveys from 2011 through 2015 in 40 southern Thai villages and recruited more than 1,100 men aged 25 or older across regular, occasional, former, and non-user groups. The material of interest was traditional fresh-leaf chewing, not concentrated extract tablets or modern liquid shots.

Common health complaints were not more frequent among users than among former and non-users in that observational cohort. At the same time, dependence and intoxication were clearly present. High dependence scores were associated with more intense withdrawal, often beginning within 1 to 12 hours after the last consumption. Intoxication was reported by 57.9% of regular users and 29.3% of occasional users.

The most accurate reading holds both findings together. The study did not find a broad increase in common complaints among its long-term fresh-leaf users, but it did find a meaningful dependence risk. Smoking was also common in the user group, follow-up was incomplete, and the design could identify associations rather than prove that kratom caused or prevented a health outcome.

Objective laboratory data add another part of the picture

A 2026 cross-sectional study compared blood and clinical-chemistry measures in 581 adults from a traditional-use community in Surat Thani province. After adjustment for age, sex, body mass index, smoking, and alcohol use, the researchers reported no clinically significant hematological or liver abnormalities associated with chronic kratom use. Differences in creatinine and estimated kidney filtration were interpreted as likely related to lower body mass in the user group rather than kidney injury.

Those results are specific to the studied community, its traditional forms of consumption, and the laboratory measures collected. They add objective data to the Thai record; they are not a universal safety clearance for every consumer, combination, concentrated extract, or product sold in another country.

Human pharmacokinetics were studied in Thai consumers

In 2015, Thai researchers published an early human pharmacokinetic study involving ten healthy men who had been regular kratom users. Participants consumed a chemically measured kratom tea under a prospective study protocol, and the investigators followed mitragynine concentrations over time. The concentration profiles fit a two-compartment model and showed substantial variability between individuals.

Pharmacokinetics helps explain how an alkaloid enters, moves through, and leaves the body. It does not turn a traditional tea into an approved treatment. The current kratom research overview places Thai community findings beside controlled human studies, product analysis, metabolism, adverse-event data, and the questions that remain open.

Thailand controlled kratom for most of the twentieth century

Thailand enacted a Kratom Act in 1943 and later placed the plant within Category V of its narcotics system. Those controls affected cultivation, possession, sale, and the public visibility of a practice that continued in parts of the south. Families and communities still maintained trees, preparation knowledge, and experience with both desired effects and withdrawal.

The prohibition period matters because a law can change the record it appears to describe. A practice pushed out of public view may look uncommon in official data even when it remains familiar locally. The kratom ethnobotany guide examines how interviews, observation, botanical identity, and community context recover details that administrative records miss.

The 2021 removal from the narcotics list

Thailand's Narcotic Drugs Act (No. 8) B.E. 2564 removed kratom from Category V, effective August 24, 2021. The Office of the Narcotics Control Board described the change as eliminating kratom offenses under that narcotics framework and allowing the plant to be developed for economic, medical, and research purposes.

Removal from the narcotics list was a major reversal, but it was not the end of regulation. It cleared the old classification and created space for a dedicated framework addressing cultivation, trade, public health, and misuse.

The Kratom Plant Act created the modern framework

The Kratom Plant Act B.E. 2565 was published in Thailand's Government Gazette on August 26, 2022 and came into force the following day. The Act defines the kratom plant by its scientific name. Its definition of “kratom leaf” includes the leaf, boiled leaf water, and leaf extract, while “consume” includes eating, chewing, drinking, holding in the mouth, or otherwise taking the material into the body.

The Act directs public agencies to support cultivation, processing, research, community practice, technology, and economic development while protecting health. That combination makes Thailand's model different from both blanket prohibition and an unregulated market.

Who may not be sold kratom leaves

Section 24 prohibits selling kratom leaves, or food containing kratom leaves, to people under 18, pregnant women, breastfeeding women, and any additional groups designated by notification. Sellers must communicate the prohibition at the point of sale, including through electronic-sale procedures established by the Ministry of Public Health.

Section 25 also prohibits leaf sales at educational institutions, dormitories, public parks, zoos, amusement parks, and through vending machines. Further places or sales methods can be added by ministerial notification, which is one reason a current agency check matters more than an undated travel summary.

Dangerous mixtures remain prohibited

The Act prohibits consumption of kratom leaves prepared or mixed with narcotics, psychotropic substances, drugs, hazardous substances, or other substances designated by notification, subject to narrow medical and research exceptions. It also restricts advertising or marketing intended to induce consumption of those mixtures and prohibits pressuring or deceiving another person into consuming them.

These sections respond to misuse without treating every fresh leaf as a narcotic. They also show why “legal” cannot be separated from ingredients: the plant, a simple leaf preparation, and a mixture containing controlled substances can occupy different legal categories.

Foods, supplements, extracts, and other finished products have separate rules

Section 3 preserves the laws that apply when kratom is used in food, herbal products, drugs, cosmetics, or other regulated products. Thai FDA guidance updated in December 2024 states that foods containing kratom plant parts or extracts are generally prohibited from production, import, or sale unless the product completes the applicable safety evaluation and label review under the novel-food framework, or is produced only for export under the relevant conditions.

Thai FDA also provides a route for seeking authorization for certain ground-leaf or water- or ethanol-extract ingredients in food supplements. That is an application pathway, not automatic permission. A loose leaf, bottled beverage, supplement, herbal product, and export shipment therefore require different legal questions.

Import and export are licensed activities

Section 10 requires a license to import or export kratom leaves and a notification before each shipment. The Act contains a traveler exception tied to necessary personal quantities and ministerial regulations, but that language is not a reliable invitation to carry kratom across a border. Product classification, documentation, quantity rules, airline policy, and the law at the other end of the trip can all matter.

Anyone moving kratom into or out of Thailand should confirm the current position with the relevant Thai authority and the destination jurisdiction before travel or shipment.

Legal reform did not remove dependence or adverse effects

Decriminalization changed criminal status; it did not change mitragynine pharmacology. People may experience alertness, energy, relaxation, sedation, nausea, dizziness, constipation, sweating, intoxication, tolerance, dependence, and withdrawal. The probability and intensity can vary with the consumed material, concentration, frequency, other substances, health conditions, and individual metabolism.

Regular users in Thai studies reported withdrawal and difficulty stopping, while other measured outcomes in traditional-use cohorts were less alarming than broad prohibition-era descriptions implied. Public policy has to hold those facts together: kratom has real human effects and risks, and a criminal label is not itself a scientific measurement of those effects.

What “Thai kratom” can and cannot tell a buyer

A Thai cultural reference may point to genuine history, but it does not establish that a packaged product was grown in Thailand, prepared like fresh leaf, authorized under Thai law, or tested for a particular alkaloid concentration or contaminant. Origin needs traceability; composition needs a lot-specific record; legality needs the rules for that product and jurisdiction.

The traditional knowledge and modern marketing guide provides a practical test for origin and “used for centuries” claims. For the larger distinction between plant, product, and jurisdiction, see why product type matters in kratom law.

Sources and further reading

• Thailand Government Gazette: Kratom Plant Act B.E. 2565 (authoritative Thai text)
• Thailand Office of the Council of State: Kratom Plant Act B.E. 2565 (unofficial English translation)
• Thailand Office of the Narcotics Control Board: Annual Report 2021 and removal from the narcotics list
• Thai FDA Food Division: kratom ingredients in food and authorization conditions
• Saingam et al. (2013): interviews with male villagers in southern Thailand
• Saingam et al. (2023): long-term fresh-leaf use, intoxication, dependence, and withdrawal
• Trakulsrichai et al. (2015): human pharmacokinetics of mitragynine in Thai regular users
• La-up et al. (2026): blood and clinical-chemistry measures in a southern Thai community
• Southern Thai traditional scriptures and folk-healer research
• Royal Botanic Gardens, Kew: accepted identity and native range of Mitragyna speciosa

The colonial-era kratom records guide separates Malayan administrative accounts from Thailand's own 1943 Krathom Plants Act and explains what the primary text does and does not establish.