If you’re seeing tablets, capsules, or shots labeled “Cat’s Claw” or “Rhynchophylline” at smoke shops or gas stations, read this before you take one.
The botanical relationship (this is more nuanced than “totally unrelated”)
Cat’s claw (Uncaria tomentosa) and kratom (Mitragyna speciosa) are both in the Rubiaceae family, which also includes coffee. They’re botanical cousins, not the same plant. They share a few alkaloids in common, particularly mitraphylline and rhynchophylline, both of which appear in cat’s claw and in trace amounts in kratom.
This is why marketers can technically claim some chemical relationship. But the relationship is being used as cover for something else.
Real cat’s claw is not psychoactive in the way kratom is
Uncaria tomentosa is traditionally used as an anti-inflammatory and immune-support herb, and a 2026 study examining its main alkaloids (mitraphylline, rhynchophylline, and related compounds) found they don’t show measurable binding at opioid receptors on their own. It does not produce euphoria, sedation, or pain relief like an opioid. If a “Cat’s Claw” product is hitting you like one, something else is in it.
What’s actually in these products
Lab testing on the new “Cat’s Claw” product lines suggests they contain:
- MGM-15 or MGM-16 (semi-synthetic opioids derived from 7-OH)
- undisclosed synthetic compounds with unknown pharmacology
Companies are launching these product lines under the “Cat’s Claw” name to evade regulatory scrutiny as 7-OH and related compounds get scheduled. The botanical-cousin relationship is being used as marketing cover. It’s the same playbook tianeptine used with names like “Tianaa” and “Zaza”, benign label, potent synthetic inside.
The synthetic-derivative angle is real and worth knowing about
Researchers have already demonstrated precursor-directed biosynthesis with Uncaria guianensis (a cat’s claw species) to produce novel oxindole alkaloid analogues, including fluorinated versions. That’s the same kind of structural modification (adding fluorine to a kratom-family alkaloid) that produced MGM-16 from MGM-15. The cat’s claw scaffold is being looked at as a starting point for novel synthetic compounds, and there’s nothing stopping unregulated chemists from doing the same work and selling the results under the “Cat’s Claw” name.
In other words: real cat’s claw extract is benign, but products marketed as “Cat’s Claw” may contain synthetic modifications of cat’s-claw-related alkaloids that have nothing to do with the traditional herb.
Why this matters
- Full opioid-class dependence, tolerance, and withdrawal. These bind mu and delta receptors hard.
- Won’t show on standard drug tests. Probation, employment, treatment program panels, none of them are looking for these compounds.
- No human safety data. Dose, half-life, long-term effects, drug interactions, all unknown.
- What’s in the bottle isn’t always what’s on the label, even within the same brand, batch-to-batch variation is real.
If you’re already taking one of these
You’re not alone, and you’re not the first person to get caught by a deceptive label. If you’re trying to stop and getting hit with classical opioid withdrawal you weren’t expecting, that’s the synthetic opioid in the product, not “cat’s claw withdrawal,” because that doesn’t exist.