Kratom is the dried leaf of Mitragyna speciosa, a tropical tree in the coffee family native to Southeast Asia. For at least two centuries, leaves of this tree have been chewed, brewed into tea, or dried and ground into powder by laborers, farmers, and traditional healers across Thailand, Malaysia, Indonesia, Myanmar, and Papua New Guinea. In the last two decades it has become widely available in the United States and Europe, where it sits in a regulatory gray zone, debated for both its potential harm-reduction value and its real risks.
This guide covers what kratom actually is, where it comes from, how it works pharmacologically, the different strains and formats you’ll see on shelves, how dosing works, side effects to watch for, the current legal landscape, and how to tell legitimate kratom from the synthetic look-alikes that have infiltrated vape shops in the last few years. It is meant to be the single resource a curious adult can read once to understand the entire picture.
Nothing here is medical advice. Kratom is not FDA-approved for any medical use. If you are under 21, pregnant, nursing, or have a medical condition, do not use kratom. If you are struggling with substance use, SAMHSA’s free, confidential 24/7 helpline is 1-800-662-HELP (4357).
The botany: what kratom actually is
Kratom (Mitragyna speciosa Korth.) is an evergreen tree that grows 12 to 30 meters tall in the rainforests of Southeast Asia. It’s in the same family as coffee (Rubiaceae), and like coffee, the part that matters for human use is not the bean or fruit but the leaf.
A mature kratom leaf is glossy, dark green, and about the size of a hand. Down the center of each leaf runs a vein. In a fresh leaf, that vein can be red, green, or white depending on the leaf’s maturity, the genetics of the tree, and the growing conditions. After harvest, leaves are dried, with the drying method (sun, shade, indoor with humidity control, or fermented) affecting the final alkaloid profile.
That central vein color is what producers use to sort dried kratom into the three common categories you’ll see on shelves: red, green, and white. We’ve written a full breakdown of how the vein color affects the experience in our red vs green vs white vein kratom guide.
Where kratom comes from
The geographic heart of kratom production is Indonesia, specifically the island of Borneo (Kalimantan) and the western island of Sumatra. Indonesia exports the overwhelming majority of the kratom consumed worldwide. Thailand, where the tree also grows natively, banned kratom in 1943 (largely to protect the opium tax monopoly), and only fully relegalized it in 2021. Malaysia and Myanmar still have legal restrictions of various kinds.
Historical use in those countries is mostly utilitarian rather than ceremonial. Manual laborers, fishermen, and farmers chewed fresh leaves through the workday as a mild stimulant to fight fatigue and heat. Older or larger doses, often brewed as a strong tea in the evening, were used for relaxation, pain, or to help with the discomfort of long labor. Folk medicine traditions also used kratom decoctions for diarrhea, coughs, and as a topical for wounds.
Kratom only entered mainstream Western consciousness in the late 2000s, when online forums and head shops started importing dried leaf powder. Today, the U.S. market is the largest single market outside Southeast Asia, with the American Kratom Association estimating somewhere between 10 and 20 million American adults have used it at least once.
How kratom works: alkaloids and receptors
Kratom leaves contain more than 40 different alkaloids. Two of them do the bulk of the pharmacological work: mitragynine and 7-hydroxymitragynine (often shortened to 7-OH).
Mitragynine is the dominant alkaloid by mass, representing 60-70 percent of total alkaloid content in most strains. At low doses it acts as a partial agonist at mu-opioid receptors and also touches alpha-adrenergic and serotonergic systems. The result is a mild, stimulating, alert effect that most users describe as similar to several cups of strong coffee with a soft edge of well-being.
7-hydroxymitragynine is present in much smaller quantities (typically 0.5 to 2 percent of total alkaloids), but it is dramatically more potent per milligram at the mu-opioid receptor. As the dose of kratom rises, the cumulative 7-OH activity becomes more noticeable, which is why kratom shifts from stimulant-like at small doses to sedating and analgesic at higher doses. This is the dose-response curve that makes kratom unusual: same plant, opposite effects, depending on how much you take.
Importantly, kratom’s action at the mu-opioid receptor is biased: it activates the G-protein pathway (the analgesic, mood-affecting side) more than the beta-arrestin pathway (the respiratory depression side). This is part of why pure leaf kratom has a wider safety margin than full opioids when taken alone. It is also why combining kratom with full opioids, benzodiazepines, or alcohol is dangerous: those compounds add the respiratory risk that kratom alone largely avoids.
Strains and vein colors
The three categories you’ll see most often are red, green, and white. These describe the vein color of the leaf and broadly correspond to leaf maturity at harvest and the drying process used:
- Red vein: most mature leaves, often dried with more UV exposure. Generally more relaxing, often used in the evening or for discomfort.
- Green vein: middle-stage maturity, balanced drying. Considered the middle of the road, forgiving for beginners.
- White vein: youngest leaves, dried indoors with minimal UV. More stimulating, often described as a coffee-like lift.
Within each color, growing region and strain name (Bali, Maeng Da, Borneo, Malay, Sumatra, Indo, Thai, etc.) add additional flavor. These names are sometimes geographic, sometimes marketing, and the only reliable way to know what you’re actually getting is a vendor that publishes batch-level lab certificates of analysis (COAs). For a deeper dive, see our complete guide to kratom strains and the red vs green vs white comparison.
Formats: powder, capsules, tablets, gummies
Once kratom leaf is dried, it can be sold in several forms. Each has tradeoffs:
- Powder: the rawest, cheapest, most flexible form. Loose ground leaf. Bitter, earthy taste. Lets you dose precisely with a kitchen scale. Best for experienced users and the lowest cost per gram.
- Capsules: powder pre-measured into gelatin or vegetable capsules. Each capsule typically holds 0.5 to 0.7 grams. No taste, easy travel, but slower onset because the capsule has to dissolve.
- Tablets: pressed kratom with binders. Often coated. Convenient and fast, but you’re paying for processing.
- Gummies: kratom alkaloids in a chewable candy format. Convenient, but the mg of alkaloid per gummy varies wildly between brands. Demand a COA before buying.
We have detailed comparisons of powder vs tablets vs gummies and a side-by-side of gummies vs powder specifically.
Dosage
Dosage is where most kratom problems start. The same plant can feel like coffee at 1.5 grams and like a sedative at 5 grams. There is no single right dose: it depends on your body weight, tolerance, what you’ve eaten, the strain, and the freshness of the batch.
A general beginner framework:
- 1 to 2 grams: very mild, often subtle. A good first-time dose. Wait 45 to 60 minutes before considering more.
- 2 to 4 grams: moderate. Stimulant-leaning for most users.
- 4 to 6 grams: stronger. Effects shift toward relaxation and analgesia for most.
- 6+ grams: heavy. Sedating, sometimes uncomfortable. Higher side-effect risk.
Body weight matters. A 250-lb person and a 110-lb person responding to 4 grams will have very different experiences. We’ve broken down the relationship between body size and kratom dose in our kratom weight and dosing guide.
Always start low. Always use a digital scale. Always wait the full onset window before redosing. Skipping these steps is how people end up with the wobbles (nausea, dizziness from too much too fast).
What people use kratom for
Survey research on U.S. kratom users (most notably work from the Johns Hopkins kratom group) consistently identifies a handful of common use cases:
- Energy, focus, and fatigue management (lower doses, white or green strains)
- Discomfort, joint pain, post-injury pain management (higher doses, red strains)
- Anxiety and mood regulation (low to moderate doses, often green strains)
- Sleep difficulty (red strains, evening doses)
- Self-managed harm reduction during opioid use disorder recovery
That last category deserves its own note. A meaningful percentage of long-term kratom users in the U.S. report having used kratom to step down from prescription opioids or heroin. The research on whether this is effective long-term is mixed but suggestive enough that the topic deserves more peer-reviewed study. We’ve reviewed the published research in our kratom and opioid cessation research review. The short version: it may help some people in some contexts, but FDA-approved medications (buprenorphine, methadone, naltrexone) remain the gold standard and are dramatically more effective than self-managed kratom routines.
Side effects
Kratom has a wider safety margin than full opioids but is not free of side effects. Common ones, by frequency:
- GI issues: constipation, dry mouth, nausea (especially on an empty stomach with higher doses)
- Itching: at moderate-to-high doses, due to opioid receptor activity
- Sweating, especially at night
- Reduced appetite over sustained use
- Headaches the morning after a heavy day, often from dehydration
- Tolerance build-up over weeks to months of daily use
- Dependence and withdrawal after months of regular use, particularly at higher doses
For the full breakdown including the withdrawal curve and harm-reduction protocols, see our kratom side effects and withdrawal guide.
Tolerance, dependence, and withdrawal
Anything that activates mu-opioid receptors with regularity will produce tolerance, and if used long and heavily enough, dependence. Kratom is no exception. Most people who use kratom occasionally (a few times a week, at moderate doses) never develop meaningful dependence. People who use kratom multiple times a day, at higher doses, for many months are at real risk of a withdrawal syndrome if they stop suddenly.
The withdrawal curve, broadly:
- Hours 6 to 24: flu-like onset, restless legs, runny nose, GI upset
- Days 1 to 3: peak. Sweats, chills, insomnia, muscle aches, cravings
- Days 4 to 7: acute physical symptoms taper down
- Weeks 2 to 4: PAWS (post-acute withdrawal): mood, sleep, motivation issues
- Months 1 to 3: gradual return to baseline
Tapering at roughly 10 percent per week is dramatically more comfortable than cold turkey. The full taper protocol is documented in our side effects and withdrawal article.
Legal status
In the United States, kratom is legal at the federal level. The DEA tried to schedule it as a Schedule I substance in 2016 and faced an unprecedented public backlash that caused them to withdraw the proposal. Since then, the FDA has continued to flag concerns, but no federal scheduling has happened.
State-level status varies. As of 2026, kratom is banned outright in six states (Alabama, Arkansas, Indiana, Rhode Island, Vermont, Wisconsin). A growing list of states has passed Kratom Consumer Protection Acts (KCPAs), which keep kratom legal but require lab testing, accurate labeling, age restrictions, and bans on dangerous synthetic analogs. Notable KCPA states include Arizona, Colorado, Georgia, Maryland, Mississippi, Missouri, Nevada, Oklahoma, Texas, Utah, Virginia, and West Virginia.
City and county bans also exist within otherwise-legal states. For the full state-by-state breakdown and a list of cities with local bans, see our 2026 state-by-state legal status guide. For the longer regulatory history and what’s driving the federal back-and-forth, see why the government wants to ban kratom.
The MGM-15 problem: synthetic look-alikes
In the last few years, a synthetic compound called MGM-15 has begun appearing in vape shops, gas stations, and head shops, often labeled as kratom. MGM-15 is a lab-synthesized analog of mitragynine, modified to be 30 to 200 times more potent at the mu-opioid receptor. It is not kratom. It does not occur in the plant in any meaningful quantity. It is made in a reactor.
Because there is no federal regulation forcing accurate labeling, synthetics like MGM-15 ride on the kratom brand to reach customers who think they’re buying plant material. The risk profile is much higher: faster tolerance, harder withdrawal, higher overdose risk. The shot-bottle and brightly-colored gummy format you see at gas station counters is the warning sign. Real kratom is sold as plain powder, capsules, tablets, or as straight whole-leaf tea, from vendors who publish COAs.
If you want to understand the synthetic threat in detail, our MGM-15 explainer covers the chemistry, the supply chain, and how to spot it on a shelf.
How to buy kratom responsibly
If you’ve decided kratom is something you want to try or use regularly, the single most important step is choosing a vendor that actually publishes batch-level lab certificates of analysis. Here’s what a responsible kratom purchase looks like:
- Demand the COA. A real vendor publishes per-batch lab results showing mitragynine and 7-hydroxymitragynine content, plus contamination testing for heavy metals (lead, cadmium, arsenic, mercury) and microbial load.
- Buy plain leaf, not extracts and shots. Powder, capsules, tablets. Extracts and shots are where synthetics hide.
- Verify the alkaloid percentages. Normal mitragynine content is 1 to 2 percent of dry leaf weight. Numbers above 2.5 percent should make you suspicious unless the product is explicitly marketed as concentrated extract with documentation.
- Check the strain origin. Reputable vendors disclose what strain (red Bali, white Maeng Da, etc.) and ideally what region of Indonesia the leaf came from.
- Avoid “enhanced” and “extreme” products. Marketing words like Maxed Out, Elite, Ultra typically signal synthetic-spiked products.
- Verify the vendor follows the Kratom Consumer Protection Act. Even if your state hasn’t passed one yet, responsible vendors voluntarily comply with the model.
Frequently asked questions
Is kratom safe?
Pure leaf kratom, used at moderate doses by adults without contraindications, has a wider safety margin than full opioids. It still has real side effects, real dependence potential, and is not appropriate for everyone. It is not approved by the FDA for any medical use. “Safe” is the wrong word; the right framing is “safer than the alternatives some people would otherwise use,” with real but generally manageable risks.
Is kratom addictive?
Kratom can produce tolerance, physical dependence, and a withdrawal syndrome with regular heavy use. Whether that meets the clinical definition of addiction depends on individual patterns of use. Most occasional users do not become dependent. Daily multi-gram users for many months are at meaningful risk.
Does kratom show up on drug tests?Standard 5- and 10-panel urine tests do not test for kratom alkaloids. Specialized kratom panels exist and are sometimes used by employers in specific industries (transportation, healthcare). It does not show up as an opioid on standard tests.Can I take kratom with other medications?
Talk to a doctor before combining kratom with anything else. Particular caution with: full opioids, benzodiazepines, alcohol, MAOIs, SSRIs (serotonin syndrome risk), and CYP450-metabolized medications (kratom inhibits CYP3A4 and CYP2D6, which can affect blood levels of many drugs).
How long does kratom last?
Onset is typically 30 to 60 minutes orally. Peak effects last about 2 to 4 hours. Some residual effects persist for 5 to 8 hours total.
What’s the difference between red, green, and white?
Vein color reflects leaf maturity and drying. Red is generally more relaxing, white more stimulating, green in the middle. Within-strain batch variation is often larger than between-color differences, so dose, freshness, and lab testing matter more than color in practice. See our vein color guide for the full breakdown.
How is kratom different from MGM-15?
Kratom is the dried leaf of a plant. MGM-15 is a synthetic compound made in a lab and labeled as kratom in vape shops. Different risk profiles entirely. See our MGM-15 explainer for the chemistry.
The bottom line
Kratom is a real plant with a long traditional history and a real pharmacological effect that varies dose-dependently from stimulant-like at low doses to sedating at high doses. It is legal in most of the United States, banned in a handful of states, and regulated under Kratom Consumer Protection Acts in a growing number of others. It has a wider safety margin than full opioids when used alone, but it is not without side effects, dependence potential, or withdrawal risk for long-term heavy users.
The right approach for an adult who decides to use it: start low, use a scale, buy from a vendor with COAs, stick to plain leaf rather than extracts and shots, avoid synthetic look-alikes like MGM-15, do not combine with alcohol or benzodiazepines, do not use if pregnant or under 21 or with serious medical conditions, and talk to a doctor first if you have any condition or are on other medications.
Disclaimer: This article is educational, not medical advice. Kratom is not approved by the FDA for any medical use or condition. If you are pregnant, nursing, under 21, or have a medical condition, do not use kratom. If you are struggling with substance use of any kind, SAMHSA’s free confidential 24/7 helpline is 1-800-662-HELP (4357). Always consult a qualified healthcare provider before starting or stopping any substance.
For a strain-by-strain breakdown of which kratom works best for pain specifically, see our best kratom for pain guide.
For sleep specifically (red strains, evening dosing, timing), see best kratom for sleep.
Quick answers to common kratom questions: kratom FAQ (28 questions).