Kratom is a plant-based supplement that people use primarily for pain relief, energy, mood enhancement, and managing opioid withdrawal symptoms. Its active compounds interact with the same brain receptors as opioids, producing effects that range from stimulating at low doses to sedating at higher ones. However, none of these uses have been validated in rigorous clinical trials, and the FDA has warned consumers against using kratom due to risks including liver toxicity, seizures, and dependence.
How Kratom Works in the Body
Kratom leaves contain dozens of active compounds, but two do most of the heavy lifting. The first, mitragynine, is the most abundant and acts primarily on the brain’s mu-opioid receptors, the same receptors targeted by morphine and other painkillers. Interestingly, mitragynine actually blocks those receptors rather than activating them. The second compound, 7-hydroxymitragynine, is far less abundant but roughly 100 times more potent at binding to those same receptors, and it partially activates them, producing opioid-like effects such as pain relief and sedation.
This dual action helps explain why kratom’s effects shift depending on how much you take. At low amounts (roughly 1 to 10 grams of raw leaf), the stimulant properties dominate: increased alertness, physical energy, talkativeness, and sociability. At higher amounts (20 grams and above), the sedative and pain-relieving effects take over, producing deep relaxation and euphoria. Effects kick in within minutes and typically last a few hours.
Pain Relief
Pain management is the most commonly cited reason people turn to kratom. Because 7-hydroxymitragynine partially activates the same receptors as prescription opioids, it can produce genuine analgesic effects. Users report relief from chronic back pain, arthritis, fibromyalgia, and other persistent pain conditions, often after becoming frustrated with conventional treatments or wanting to avoid prescription opioids.
The evidence supporting these reports, though, is almost entirely anecdotal. Memorial Sloan Kettering Cancer Center notes that kratom “may have pain-relieving properties similar to opioids” but emphasizes that there isn’t enough information to confirm whether it’s safe or effective for this purpose. One major challenge is that kratom is a mixture of many compounds whose concentrations vary from batch to batch, making it nearly impossible to standardize a dose. For cancer patients specifically, established painkillers provide more reliable and effective relief.
Opioid Withdrawal and Addiction
Many people use kratom to self-treat opioid withdrawal, hoping its partial activation of opioid receptors can ease symptoms like muscle aches, insomnia, anxiety, and cravings without the full risks of stronger opioids. This is one of kratom’s most discussed potential uses, particularly in online communities where users share detailed protocols for tapering off heroin or prescription painkillers.
The clinical picture is less encouraging. The Mayo Clinic states plainly that kratom “hasn’t proved to be an effective treatment for opioid withdrawal” and warns that rather than treating addiction, kratom use may itself lead to dependence and withdrawal symptoms. Over time, regular users can develop cravings and may eventually need the same medications used to treat opioid use disorder. The FDA echoes this concern, citing the risk of substance use disorder as a primary reason it advises against kratom use.
Mood, Energy, and Anxiety
Beyond pain, people report using kratom to boost energy, improve focus, reduce social anxiety, and lift their mood. At lower doses, the stimulant effects can feel similar to a strong cup of coffee (kratom is botanically related to the coffee plant). Some users describe feeling more motivated, talkative, and socially comfortable.
At moderate to higher doses, the mood effects shift toward calm and relaxation, which some people find helpful for anxiety or insomnia. These reported benefits are real experiences for many users, but they haven’t been tested in controlled trials. The biological mechanisms behind kratom’s mood effects aren’t fully mapped, and the line between a therapeutic dose and a problematic one is blurry given the inconsistency between products.
How Different Strains Compare
Kratom is sold in several varieties based on the color of the leaf vein, and each carries a different reputation among users.
- Red vein is the most popular for pain and relaxation. Users describe calming, sedative effects and report that it helps with insomnia and opioid withdrawal symptoms.
- White vein is considered the most stimulating variety. It’s associated with mood enhancement, improved concentration, and alertness, with the highest potential for euphoria.
- Green vein falls between red and white, producing mild energy without heavy sedation or overstimulation. Users often describe feeling more open and sociable. Green strains are sometimes blended with red or white to balance out extremes of drowsiness or agitation.
- Yellow or gold vein products are typically fermented, which increases the concentration of 7-hydroxymitragynine. These tend to act as relaxants with reportedly fewer side effects and less sedation than red strains.
These distinctions are based on user reports and vendor marketing rather than controlled research. Alkaloid profiles vary not just between vein colors but between individual batches, growing regions, and processing methods. A red strain from one supplier may feel quite different from a red strain sold by another.
Safety Risks and Side Effects
Kratom carries real risks that are worth weighing against its reported benefits. Common side effects mirror those of opioids: nausea, vomiting, constipation, and sedation. More serious concerns include liver toxicity, seizures, and respiratory depression, which in rare cases has contributed to death. The FDA has confirmed deaths associated with kratom use through medical examiner and toxicology reports.
Dependence is a significant concern with regular use. Your body can adapt to kratom the same way it adapts to opioids, meaning you’ll need more over time to get the same effects and will experience withdrawal if you stop. Kratom withdrawal symptoms resemble opioid withdrawal: muscle aches, irritability, insomnia, and cravings. The FDA has also documented cases of neonatal abstinence syndrome in newborns whose mothers used kratom during pregnancy, with symptoms including jitteriness, irritability, and muscle stiffness.
Product contamination adds another layer of risk. The FDA has issued warnings after kratom products were found to contain salmonella and concerning levels of heavy metals. Because kratom is sold as a supplement rather than a regulated medication, there’s no guarantee of purity, potency, or accurate labeling.
Legal Status
Kratom occupies a legal gray area in the United States. It is not a federally controlled substance, so it remains legal at the national level. However, several states and municipalities have banned or restricted it, and the regulatory landscape continues to shift. The FDA has repeatedly warned consumers against using kratom and has taken enforcement actions against companies making unproven health claims about their products. In 2016, the DEA considered classifying kratom as a Schedule I substance but backed off after public pushback. The question of federal scheduling remains unresolved.
If you’re in a state where kratom is legal and you choose to use it, the lack of standardized products means you’re largely on your own when it comes to gauging dose and quality. Third-party lab testing, when available from a vendor, is one of the few quality signals consumers can look for.