Missouri Is the Latest: A Tablet Sold as Kratom Tested Positive for a Synthetic Opioid

If you bought something at a gas station or a smoke shop that was labeled "kratom," you cannot assume that is what you got. That is the message St. Louis County health officials delivered this week after laboratory testing found a synthetic opioid inside a tablet marketed as a kratom product.

The warning is calm advice, not a reason to panic — but it matters, because these products are legal to sell in most of the country, they sit on shelves next to candy and energy drinks, and the packaging gives a family no way to tell what is actually inside.

What the health department reported

According to the St. Louis County Department of Public Health, lab testing identified a synthetic opioid in a tablet that was being sold as a kratom product. Officials said the item was packaged in the same style as products sold at smoke and vape shops, and that the packaging closely resembled the product involved in the deaths of two University of Mississippi students in September.

The department's advice to the public was specific and simple: check the labels on products you buy, and treat what those labels claim with skepticism.

Health officials have not publicly named the exact compound found in the St. Louis County tablet. That detail matters less than the pattern it confirms. Over the past two years, investigators and state health agencies across the country have repeatedly found that products sold as "kratom" — and especially the concentrated, semi-synthetic versions — do not always contain what the package says.

The most common culprit is 7-hydroxymitragynine, usually shortened to 7-OH. It is a compound that occurs naturally only in tiny amounts in the kratom plant but is now manufactured in concentrated form, sold as tablets, gummies, shots and capsules, and marketed as a legal, "natural" way to relax or manage pain. According to the National Institute on Drug Abuse (NIDA), both mitragynine and 7-OH act on the mu-opioid receptors in the brain — the same receptors that fentanyl, morphine and prescription painkillers act on.

Why a contaminated "herbal" product is a serious problem

Three clinical facts explain why health departments treat these findings as urgent:

1. Potency is unpredictable. In the plant itself, 7-OH is present in trace amounts. In concentrated commercial products, it can be many times stronger. Two tablets that look identical can deliver very different doses — and a user has no reliable way to know which one they are taking.

2. It can slow breathing, and naloxone reverses it. NIDA notes that 7-OH — unlike the leaf or plain mitragynine — can cause respiratory depression, the slowed or stopped breathing that kills people in an opioid overdose. The good news is that this effect is opioid-specific, which means naloxone works. It is not a wasted dose.

3. A fentanyl test strip will not catch it. Standard fentanyl test strips detect fentanyl and some related compounds. They are not built to detect 7-OH, mitragynine or other kratom-derived opioids. A negative strip is not proof that a product is safe, and it is not proof that what you are holding is really kratom.

There is a fourth reason officials keep repeating the "check the label" warning: the labels themselves are frequently wrong. Products marketed as one thing have been found to contain another — including, in some cases, illicit opioids. That is not a labeling quirk. It is an overdose risk, because the person taking it has no tolerance to the drug they are actually receiving.

Where the federal government stands

This is not a fringe concern. On July 6, 2026, the Drug Enforcement Administration published a notice of intent to temporarily place 7-hydroxymitragynine above a specified concentration threshold into Schedule I of the Controlled Substances Act; the public comment period was later extended to late August. The DEA's stated target is the concentrated manufactured products, not traditional botanical kratom leaf. Separately, the Food and Drug Administration has not approved 7-OH or kratom for any medical use.

States have been moving on their own. Missouri's health department issued a 7-OH advisory in late 2025, and the state attorney general has pursued sellers of concentrated kratom and 7-OH products. Florida's medical examiner system has linked multiple deaths to concentrated kratom products. Michigan, Idaho, Utah, California and others have issued their own warnings or restrictions. In short: this is a national supply problem, and Missouri is simply the newest place where a health department has confirmed it at the bench.

What to do — plainly

If you or someone you love uses these products, none of this is a reason for shame. It is a reason for information.

• Do not assume a product is what the label says. "Kratom," "7-OH," "herbal blend" and "botanical extract" are marketing terms, not guarantees of contents or dose.
• Start low and do not use alone. Most fatal overdoses happen when no one is present to call for help.
• Keep naloxone where you can reach it — not in a drawer you have to search. Two or more doses is safer than one; if breathing does not return, repeat and keep rescue breathing going.
• Call 911 at the first sign of trouble — slow or stopped breathing, snoring or gurgling sounds, blue lips, extreme drowsiness, or unresponsiveness. Missouri's Good Samaritan law protects people who call for help in an overdose.
• A negative fentanyl test strip does not clear a product. It only means no fentanyl was detected.
• Do not stop abruptly if you have been using daily. Withdrawal from opioid-type products can be severe, and the days right after stopping are the highest-risk window because tolerance falls fast. Talk to a clinician about a managed plan.
• Medication for opioid use disorder works. Buprenorphine and methadone are FDA-approved, prescribed by licensed clinicians, and far safer than any unregulated retail product. They are not a swap of one problem for another; they are treatment.

Where to get help

• SAMHSA National Helpline: 1-800-662-4357 — free, confidential, 24/7, English and Spanish.
• Find a treatment provider: findtreatment.gov
• 988 Suicide & Crisis Lifeline: call or text 988.
• Poison Control: 1-800-222-1222.
• Emergency: 911.

Families who are unsure what their loved one has been taking do not have to guess. A clinician, a local health department, or a treatment center can help sort out what is being used, what the risks are, and what the next step is. The goal is never to frighten a person out of asking for help — it is to make sure that when they do ask, someone is ready with a plan.