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What Is MGM-16? Synthetic Kratom Opioid and Cat's Claw

What Is MGM-16? The Newest Synthetic Kratom Opioid to Watch

Last reviewed: October 21, 2026

Clinically reviewed by the Peachtree Detox & Residential clinical team · October 2026

MGM-16 started as a pain-research compound in a lab. Federal regulators scheduled it in August 2026 to get ahead of it reaching store shelves, and a related warning about tablets labeled “cat’s claw” shows why the name on a package can no longer be trusted.

Most people had never heard of kratom a few years ago. Then came 7-OH, then mitragynine pseudoindoxyl and MGM-15, each one stronger and further from the plant than the last. MGM-16 is the next name on that list, and it is turning up in news coverage and in questions from families who found a product at home and cannot tell what it is. Some people have started connecting it with the words “cat’s claw” on a label.

Peachtree Detox & Residential runs a medically supervised kratom detox program in Fayetteville. Three things matter here: what the federal record says about MGM-16, what it does not say, and what to do if someone in your house is taking a product you no longer trust.

What MGM-16 Is

MGM-16 is a semi-synthetic opioid, meaning chemists start with a natural compound and change its structure in a lab. In this case the starting material is mitragynine or 7-hydroxymitragynine, the main opioid-acting alkaloids in kratom. According to the Drug Enforcement Administration, MGM-15 and MGM-16 were developed in 2014 as part of drug-discovery research into potential pain medicines. Neither one occurs in the kratom leaf, and MGM-16 has never been approved for any medical use in the United States.

The DEA describes MGM-16 as a highly potent opioid that binds strongly to the mu-opioid receptor, the same receptor that morphine, oxycodone, and fentanyl act on, and switches it on. In animal studies it was about 240 times more potent than morphine at blocking pain. That number comes from research in mice, not people, and it should not be read as a human dose comparison. What it does tell you is the category: this is a strong opioid, closer to fentanyl than to a cup of kratom tea.

The family resemblance to MGM-15, the lab-made kratom opioid, and to mitragynine pseudoindoxyl and other pseudo-kratom products is direct. The DEA says all three share a similar pharmacological profile. The difference is that those two reached store shelves first.

Is MGM-16 Actually Being Sold?

Some online claims about MGM-16 go beyond the available evidence. In its August 2026 order, the DEA stated plainly that no evidence supported the presence of MGM-16 on the kratom consumer market at that time. What the agency did find was a vendor website listing MGM-16 for upcoming sale, and online discussions showing that some people were looking for it with the intent to use it.

Its two relatives are a different story. The DEA reports that mitragynine pseudoindoxyl was identified in at least 56 overdose cases between February 2025 and May 2026, 48 of them fatal, and that MGM-15 was detected in 17 overdose cases from February through April 2026, 16 of them fatal. Those products were sold as powders, tablets, and liquid shots, often in candy-like flavors, online and in gas stations, corner shops, and vape shops.

The DEA’s reasoning for scheduling MGM-16 anyway was that leaving it off the list while banning MGM-15 would create a loophole manufacturers were already positioned to use. Regulators scheduled MGM-16 before it was detected in testing.

What the August 2026 Federal Order Changed

On August 26, 2026, the DEA published a temporary order placing mitragynine pseudoindoxyl, MGM-15, and MGM-16 in Schedule I, the federal category for drugs with a high potential for misuse and no accepted medical use. The order is effective from August 26, 2026, until August 26, 2028, and it can be extended by a year while the permanent scheduling process plays out. Under it, making, selling, or possessing any of the three is subject to the same federal controls and penalties as other Schedule I drugs.

Georgia was already ahead on this. The state’s Kratom Consumer Protection Act, in effect since January 1, 2025, prohibits synthetic alkaloids in kratom products, so a product containing MGM-16 would have been outside Georgia law before the federal order arrived. Concentrated 7-OH is moving through a parallel federal process, and the same warning applies to it: a ban can push people into quitting 7-OH on their own, which carries its own danger.

A ban stops new sales, but the products already in someone’s kitchen cabinet stay there, and so does the body’s dependence on them. For a person who has been taking these products daily, a sudden loss of supply means sudden withdrawal.

“Cat’s Claw” Is a Real Herb, and Labels Are Using the Name

Cat’s claw is a genuine herbal supplement, and it is a separate plant from kratom. The National Center for Complementary and Integrative Health describes it as a woody vine that grows wild in the Amazon rainforest and other tropical parts of Central and South America. Most cat’s claw sold in the United States is made from Uncaria tomentosa, and it is promoted for arthritis, viral infections, and other conditions, though NCCIH notes there is no conclusive evidence it helps with any of them. A cat’s claw capsule from a pharmacy or health-food store is a different product from the smoke-shop tablets described below.

The problem is that some smoke-shop products are using the name as cover. In July 2026, the Utah Poison Control Center warned about blends of herbal supplements sold with kava or cat’s claw, naming the “Buzzers” and “Homiez” brands while noting others may be involved. The center had received multiple reports of severe overdose and suspected the products were adulterated with synthetic kratom derivatives, listing 7-OH, mitragynine pseudoindoxyl, MGM-15, or MGM-16 as possibilities. Those drugs did not appear on the labels, and some products claimed to contain no kratom or 7-OH at all. An update on July 30, 2026, linked an illegal kratom product sold in Utah County to a death.

So when people say MGM-16 is “being called cat’s claw,” here is what the public record supports. Products labeled cat’s claw have been linked to opioid overdoses, and investigators named MGM-16 as one suspected adulterant among several. When Utah’s Department of Agriculture and Food tested Buzzers-brand Cat’s Claw tablets, it found mitragynine pseudoindoxyl and MGM-15, MGM-16’s close relatives. MGM-16 itself has not been publicly confirmed as an ingredient, and the cat’s claw herb is not the danger. The practical lesson is the same either way: if a cat’s claw or kava product came from a smoke shop or gas station, treat it as a possible opioid, which is what Utah’s poison center now advises.

What These Compounds Do to the Body

Because MGM-16 acts on the same receptor as other opioids, it carries the same core risks. The first is respiratory depression, where breathing slows and becomes shallow until the brain is not getting enough oxygen, which is how opioid overdoses kill. The second is physical dependence, where the body adapts to the drug and reacts badly when it is gone. The DEA also lists heart, liver, kidney, and neurological harms for this group of compounds.

If someone is not breathing, is breathing very slowly, or cannot be woken up, call 911 and give naloxone if you have it. Utah’s poison center gives exactly that instruction for these cat’s claw and kava products. Naloxone, sold as a nasal spray, can quickly restore normal breathing when an opioid overdose has slowed or stopped it, and NIDA advises watching the person for another 2 hours afterward, because breathing can slow again. Poison control answers 24 hours a day at 1-800-222-1222.

Dependence shows up as a familiar opioid withdrawal pattern when a dose is missed. The FDA lists restlessness, body aches, fatigue, irritability, and cold sweats for related 7-OH products, and stomach upset and sleeplessness are common too. The kratom withdrawal timeline gives a sense of how those days usually unfold, and seizures have been reported with concentrated products, which is why seizures from kratom withdrawal deserve to be taken seriously before anyone tries a home taper.

If Someone You Love Has Been Taking These Products

Finding a pack of “herbal” tablets and realizing they may be an opioid is a disorienting moment, for the person taking them and for whoever found them. Many people who end up dependent on these products started with something that looked legal and harmless, often to manage pain, anxiety, low mood, or withdrawal from another opioid. The FDA has documented that pattern of self-treatment with 7-OH products.

A few steps help:

  • Keep the packaging: brand name, lot number, and where it was bought help a medical team understand what may be in it.
  • Ask about pattern, not just product: how often, how much, and for how long tells you more about physical dependence than the label does.
  • Do not force a sudden stop at home: abrupt withdrawal from a strong opioid is miserable, and going back to the old dose after a few days off is when overdose risk peaks.
  • Keep naloxone in the house: it is the right first response to any suspected opioid overdose, whatever the product claimed to be.

Why Supervised Detox Fits This Problem

With a compound this new, nobody can promise exactly how withdrawal will go, and that uncertainty is itself a reason not to do it alone. On a medical detox unit, nurses monitor vital signs through the night, symptoms are treated as they appear, and a physician-led team adjusts the plan as the picture becomes clearer. Where it is clinically appropriate, Suboxone and other forms of medication-assisted treatment can ease opioid withdrawal and cravings; whether and when to use them is a decision our medical team makes with each person.

Detox is the start. Many people were using these products to manage something else, whether pain, anxiety, depression, or trauma, and our residential kratom addiction treatment works on those reasons with individual therapy, CBT, DBT, and family therapy.

Getting Off Lab-Made Kratom Opioids Safely in Fayetteville

If a product in your house turned out to be something other than what the label promised, you are dealing with a problem the labeling created, and you do not have to sort it out by yourself. Peachtree Detox & Residential is at 1008 GA-54 in Fayetteville, a short drive for families in Peachtree City, Newnan, Tyrone, and the rest of Fayette and Coweta counties and about a half hour south of Hartsfield-Jackson for anyone traveling in. Bring the packaging if you have it.

Reach us through the admissions page, whether you are the one taking the product or the one who found it, and our team can walk you through what an admission involves and go over your coverage. If someone is not breathing or cannot be woken, call 911 first and give naloxone.

Frequently Asked Questions About MGM-16

Is MGM-16 the same thing as kratom?

No. Kratom is a plant whose leaves contain the alkaloids mitragynine and, in trace amounts, 7-OH. MGM-16 does not occur in the plant. It is made in a lab by chemically modifying those alkaloids, and it was originally developed in 2014 as a research compound for pain. In animal studies it was about 240 times more potent than morphine, and the DEA classifies it as a highly potent opioid.

Is MGM-16 illegal?

Yes, federally. A DEA temporary order placed MGM-16, MGM-15, and mitragynine pseudoindoxyl in Schedule I effective August 26, 2026, through August 26, 2028, with a possible one-year extension. In Georgia, synthetic kratom alkaloids were already prohibited under the Kratom Consumer Protection Act, in effect since January 1, 2025.

Is cat’s claw the same as MGM-16?

No. Cat’s claw is a real herbal supplement made from a South American vine, a different plant from kratom. The concern is with smoke-shop products labeled cat’s claw or kava. In July 2026, the Utah Poison Control Center linked some of those products to severe overdoses and suspected they contained hidden synthetic kratom opioids, naming MGM-16 among several possibilities. When Utah’s Department of Agriculture and Food tested Buzzers-brand Cat’s Claw tablets, it found mitragynine pseudoindoxyl and MGM-15, MGM-16’s close relatives. MGM-16 itself has not been publicly confirmed as the ingredient, but a cat’s claw product bought at a smoke shop should be treated as a possible opioid.

Can someone detox from these products at Peachtree Detox & Residential?

Yes. Our kratom detox program provides medically supervised withdrawal care in Fayetteville, with symptoms treated as they come and medication-assisted treatment available when our medical team decides it fits. Detox flows into residential treatment on the same campus. Peachtree Detox & Residential works with many insurance plans, and our admissions team can check your coverage and explain private-pay options.

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