Best Kratom for Pain? What the Lab Found When It Tested Red, Green and White

What kratom strains are most effective for chronic pain?

Red Bali, the red vein this page once called the “Ultimate Pain Warrior,” came back from an independent lab with the lowest mitragynine of six strains.

The gap was tiny: 1.40% against 1.56% for Green Maeng Da, with no significant difference between red, green and white. Yet the 644 people surveyed, mostly that vendor’s customers, still reported each color the way the marketing sells it.

I’ve bought kratom since 2016, and I wrote the old page from that same marketing. No strain or color has been shown to be the best kratom for pain. What you can check is the lot in your bag.

In recruited surveys, pain tops the reasons people give for using kratom, but no trial we found has tested it in chronic pain. Dependence is real, 7-OH tabs are not kratom, and several states ban it. Under 21, pregnant, on prescriptions or drug tested? Start with who should not use kratom.

Kratom Strains and Colors for Pain, Compared by Lab Report

No kratom strain or color has been shown to work better for pain. In a 2023 study of six red, green and white strains (Huisman et al.), mitragynine ranged from 1.40% (Red Bali) to 1.56% (Green Maeng Da), with no significant difference by color. All six came from one vendor, with three batches of each tested by a lab the study calls unaffiliated with that vendor.

If you’ve decided to buy, our kratom vendor comparison looks at 10 brands, shows how to read a lab report (COA) in 60 seconds, and checks each brand against the AKA list.

Total alkaloids in the same six strains ran from 2.20% to 2.44%.

Red vs Green Kratom for Pain: Why Do They Feel Different?

Nobody has shown why. In the 2023 strain study, users ranked red kratom as the most useful for “a medical condition” and white as best for concentration, but the lab found no difference in the four alkaloids it measured. If red has always felt different to you, the study doesn’t call you wrong. It just can’t explain it yet.

The authors name three possible causes and test none of them: expectation (the label shapes the experience), minor alkaloids, and terpenes. 7-OH was not measured at all. So the finding is narrow: in one vendor’s products, color did not track the main alkaloids. That is PRELIMINARY evidence: one vendor, and a survey sent to that vendor’s customers. The authors report no outside funding and no conflict of interest.

What does change the contents of a bag? Studies of trees and harvested leaf point to leaf age, season, region and drying. A 2020 analysis of 53 commercial products found mitragynine varied fourfold, a variation the authors said “is in no way reflected in the product labeling.”

Colors from one vendor differed by about a tenth, while products on the open market differed by a factor of four. The product, and the lab report for its lot, tell you more than the color does.

Can Kratom Help With Pain? What the Evidence Says

Pain is the top reason people give for using kratom, but no study we found has tested kratom in people with chronic pain. The evidence so far is user surveys, one small placebo-controlled trial using an ice-water pain test, and receptor studies in cells and mice. For the wider question of whether it works at all, see Kratom for Pain Relief: Does It Work?

• Why people use it (human survey). In a 2017 Johns Hopkins survey of 2,798 users, 91% named pain as a reason. Two other large surveys put it at 68% (a sample recruited through the American Kratom Association) and 73%. These samples are self-selected, mostly white and middle-aged, and recruited surveys tend to over-sample satisfied users.
• What they report in the moment (human EMA study). In a study run in 2022 and published in 2024, 357 regular users logged 13,401 uses on their phones over 15 days. Their reasons in the moment were practical: more energy, more productivity and less pain.
• One lab trial (human RCT, small). In Malaysia, 26 young men who already drank kratom daily kept a hand in ice water longer an hour after kratom tea, from 11.2 to 24.9 seconds on average. Placebo tea changed nothing. People with chronic pain were excluded, and the authors wrote that their findings “should not be interpreted as endorsing the use of kratom products for self-treatment of pain.”
• How it acts (cell and animal studies). Mitragynine and 7-OH act as partial agonists at the mu-opioid receptor, the receptor opioid painkillers use (ESTABLISHED in cell assays). In mice, the liver turns mitragynine into 7-OH, and that metabolite accounts for most of the pain-blocking effect (animal study, 2019).

Is Kratom an Opioid?

Kratom leaf is not a federally controlled opioid. But its two best-studied alkaloids act on the same mu-opioid receptor that oxycodone and morphine act on. That part is ESTABLISHED in cell studies.

In leaf, 7-OH is a trace: earlier lab work, summarized in a 2020 analysis, measured it at 0.01% to 0.04% of leaf content. The 7-OH tabs, shots and gummies sold in smoke shops and gas stations are semi-synthetic. A 2025 study of 304 such products found 92% of the 7-OH-only products were advertised as “kratom.” Leaf users push back hard. One commenter put it this way: “Saying 7oh is kratom, is like saying crack is just a coca leaf product.”

As of October 2026, MP (“pseudo”) and MGM-15/16 are federal Schedule I (since 26 August 2026). The DEA published a notice of intent to schedule 7-OH above a threshold on 14 October 2026, with an order possible on or after 13 November 2026. This page does not cover, rank or link any 7-OH product.

Powder, Capsules, Extracts or Shots: Does the Form Matter?

It matters most for how concentrated a serving is. Extracts and shots concentrate alkaloids by design. How much a serving holds depends on the product, and labels don’t reliably show it. Most regular users stay with the leaf: in a 2024 study of 395 regular consumers, 95.9% reported regularly using whole-leaf products such as powder or capsules, and 4.1% used extracts (human survey).

You may have read that liquid kratom is “more addictive.” The studies we read don’t settle that.

If a label lists 7-OH as an ingredient, it is not a leaf product, whatever the front of the pack says.

Is Kratom Addictive?

It can be. In a 2023 online survey of 2,061 current consumers, 25.5% met DSM-5 criteria for kratom use disorder, mostly mild or moderate. Among them, 81.3% reported tolerance and 68.0% reported withdrawal. People with another substance use disorder had 2.83 times higher odds. The sample was not random, so treat the number as a signal, not a national rate (human survey, PRELIMINARY).

An older Johns Hopkins sample found about 2% met criteria for moderate or severe use disorder. The two surveys differ in method and year, and neither is a random sample.

Frequency matters more than amount. The 2024 study of 395 regular consumers found withdrawal and use-disorder symptoms tracked dose frequency more closely than dose amount (human survey, PRELIMINARY).

Daily use is common: 59% of the 2017 Hopkins sample took kratom every day. One Erowid report describes how that can start: “Kratom masked the pain, so I started using it every day, all day long.” That is one person’s experience, not a rate.

Nobody knows yet how long withdrawal lasts. None of the studies we read put a number on it.

If you take kratom every day, here is one step you control: for two weeks, write down how many times a day you take it. Frequency is the number that tracked dependence in the research, and it gives a clinician something concrete to work with.

What Can Go Wrong: Liver, Interactions and Contamination

The FDA warns about liver toxicity, seizures and substance use disorder, and it has found contaminated products.

• Liver (case reports). A 2026 systematic review found 32 published cases of kratom-associated liver injury, mostly cholestatic. Most improved after stopping kratom. Four progressed to liver transplant. Case reports show that it happens, not how often.
• Interactions (small human study). In 12 healthy adults, a single low-dose cup of kratom tea raised blood levels of midazolam by about 39%. Midazolam is cleared by an enzyme called CYP3A4. The FDA labels for oxycodone, fentanyl and buprenorphine all warn that drugs which block CYP3A4 can push their blood levels up. If you take any prescription medicine, ask a pharmacist before you mix.
• Poison-center reports (CDC data). US poison centers logged 3,434 kratom exposure reports in 2025. From 2015 to 2025 they recorded 233 deaths, and 79% involved other substances too. The data can’t separate leaf from 7-OH products, so it shows scale, not cause.
• Contamination (FDA and CDC data). In 2019 the FDA found lead and nickel above daily exposure limits in 30 kratom products. In 2018 a Salmonella outbreak linked to kratom sickened 199 people in 41 states. A lab report covers one batch from one lab.

Is Kratom Legal Where You Live?

Legality varies by state and city, and it changed several times in 2026. Check your state and city rules before you buy anything.

How to Check a Batch Before You Pay

First, make sure kratom is legal where you live, using the table above. If it is, check these before you pay for any bag:

1. Find the lot number on the bag, or ask the seller for it before you order.
2. Ask for the COA for that lot. A general “lab tested” badge is not a COA.
3. Check the lab’s name and the test date.
4. Look for an alkaloid panel that lists mitragynine and 7-OH.
5. Look for a contaminant panel: heavy metals, microbes and Salmonella.
6. Read “AKA GMP” as what it is: a trade group’s audit. A 2023 paper described it as a process that “may ensure some quality control … but it is not a guarantee.”

If the seller can’t match a lot number to a lab report, you are buying a color, not a known product.

What We Know, What We Don’t, and What Would Change Our Mind

Who Should Not Use Kratom

Many people in pain have had a bad time with doctors. One commenter wrote: “Tired of being looked at like I’m a Junkie from doctors and nurses.” If that is you, these questions can make the next appointment more useful:

• Could kratom interact with anything I take, through CYP3A4 or otherwise?
• Should my liver enzymes be checked?
• Will my pain clinic or employer test for kratom?
• If I stop, what should I watch for, and who do I call?

Frequently Asked Questions

The Label and the Lab

The bag says Red Bali. A lot-matched lab report says what one lab found in that batch. Only one of those can be checked, so check that one.

Next step: read Kratom for Pain Relief: Does It Work? or What Is Kratom?

Update log: 18 October 2026. Rewritten from published lab data. Removed treatment claims, dosing advice, strain picks and the unsourced “more addictive” line. Legal table re-checked against federal notices and state reports.

Sources

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