What Is Cat's Claw? A Complete Guide to Uncaria tomentosa
If you have come across the name "Cat's Claw" on a label and wondered what you were actually looking at, you are asking a reasonable question. The name is a common name, not a botanical one, and common names are slippery. At least four unrelated plants answer to some version of it. This guide is about one specific vine: Uncaria tomentosa, a woody climbing plant native to the Amazon rainforest of South and Central America.
What follows is an educational overview: the botany, the naming confusion, the compounds the plant naturally contains, how modern extracts are made, and why third-party testing matters. It does not describe what Cat's Claw does in the body, because that is not a question this article is in a position to answer.
The plant: a woody vine from the Amazon
Uncaria tomentosa is a liana — a woody vine that roots in the forest floor and climbs on other vegetation rather than standing on its own. Mature specimens can reach well over 100 feet toward the canopy, with older stems as thick as a person's arm. It belongs to the family Rubiaceae, which also contains coffee and gardenia, and to the genus Uncaria, roughly forty species spread across the tropics of South America, Asia, and Africa.
Its native range covers the Amazon basin and neighboring tropical regions — Peru, Brazil, Ecuador, Colombia, Bolivia, and parts of Central America. Peru is the country most associated with commercial harvest. Because the vine depends on host trees for support, it is tied to intact standing forest in a way that a row-crop botanical is not.
The parts used commercially are the inner bark of the stem and, less commonly, the root. Harvesters typically cut a section of vine and strip the bark rather than removing the whole plant, since a cut vine can regenerate from the base. Whether that actually happens depends on who is harvesting and under what oversight — one more reason supply-chain documentation is worth attention.
Where the name comes from
The name is literal. At the leaf nodes along the stem, Uncaria tomentosa produces curved, sharply hooked thorns that grow in pairs and point downward. They are modified stem structures, and their job is mechanical: they catch on bark and branches and let the vine ratchet itself upward as it grows. The genus name Uncaria comes from the Latin uncus, meaning hook. The species name tomentosa refers to tomentum, a covering of fine matted hairs — a nod to the downy texture found on parts of the plant.
In Spanish-speaking South America the plant is called uña de gato, which translates directly to "cat's claw." The English common name is essentially a translation of the Spanish one, and both describe the same visual impression: a small, curved, claw-like hook.
The naming confusion: not every "cat's claw" is this plant
Here is where labels get genuinely misleading. Several unrelated plants also carry the common name "cat's claw," because curved thorns are a common evolutionary solution. On an ingredient panel, the Latin binomial is the only thing that tells you what you actually have.
| Common name | Botanical name | Plant family | Native range | Relationship |
|---|---|---|---|---|
| Cat's claw, uña de gato | Uncaria tomentosa | Rubiaceae | Amazon basin, South and Central America | The vine described in this article |
| Cat's claw, uña de gato | Uncaria guianensis | Rubiaceae | Northern South America | A close relative in the same genus, sometimes sold under the same common name |
| Cat's claw vine, cat's claw creeper | Dolichandra unguis-cati | Bignoniaceae | Central and South America; invasive in Australia and elsewhere | Unrelated ornamental climbing vine |
| Catclaw acacia, catclaw mimosa | Senegalia greggii | Fabaceae | Southwestern United States, northern Mexico | Unrelated desert shrub in the legume family |
| Devil's claw | Harpagophytum procumbens | Pedaliaceae | Southern Africa | Different common name, frequently confused; entirely unrelated |
The practical takeaway: a label that says only "cat's claw" has told you very little. A label that says "Uncaria tomentosa" has told you something specific and checkable. Every product we carry names the species outright — you can see the full lineup on our Cat's Claw collection.
What the plant naturally contains
Uncaria tomentosa has been characterized chemically in some detail, and its bark contains several recognized classes of naturally occurring compounds. Naming them is a matter of plant chemistry, not a statement about what any of them do in a human body:
- Oxindole alkaloids. The constituents most often used to characterize the species in the laboratory. They occur in two structural forms — pentacyclic and tetracyclic — and populations differ in which predominates. That chemotype variation is one reason identity testing matters.
- Indole alkaloids. A related family of nitrogen-containing plant compounds found alongside the oxindoles.
- Polyphenols. A broad group of plant compounds including tannins and related phenolic constituents, common across the plant kingdom and present here as well.
- Other plant constituents. As with any whole botanical, the bark also contains sterols, glycosides, and ordinary structural plant material.
A note on reading that list: the presence of a named compound is a chemical fact, not a claim, and should not be read as an implied one. When a marketer names a compound and lets you draw a conclusion, that is a claim by insinuation. We name these because you should know what is in the material, full stop.
Traditional use: history, not evidence
Uncaria tomentosa has a long documented history of use among Indigenous peoples of the Amazon, including Asháninka communities in Peru, where bark was prepared by decoction — simmering in water — as part of established cultural practice. Outside interest grew through the twentieth century, and by the 1990s the plant had entered the international botanical trade at scale.
That history is context worth knowing. It is not evidence that the plant produces any particular effect. Traditional use tells you a culture valued a plant and built practices around it. It does not establish a mechanism, a dose, a safety profile, or an outcome, and it is not a substitute for research. Controlled human research on Uncaria tomentosa is limited, and we mean that plainly rather than as a hedge.
From bark to modern extract
Most Cat's Claw on the market today is not raw bark. It is an extract, which is a concentrated preparation made by pulling soluble plant material out of the milled bark with a solvent, then removing the solvent. Common approaches include water extraction, similar in principle to the traditional decoction method, and hydroalcoholic extraction using a water-and-ethanol mixture. The resulting liquid is filtered and concentrated, then either kept as a fluid extract or dried into a powder by methods such as spray drying.
Two terms you will see on labels are worth understanding:
- Extract ratio (written as 4:1, 10:1, and so on) describes how much raw bark went into a given weight of finished extract. A 10:1 extract started with ten parts bark for every one part of finished material.
- Standardization means the manufacturer has tested for a specific marker compound and adjusted the batch so that it falls within a stated range. It is a consistency measure between batches — not a grade of quality on its own, and not an effect claim.
Flavored formats and what they are for
Raw botanical extracts are bitter and astringent, which is the honest reason flavored formats exist. Flavoring does not change what the botanical is; it changes whether people can reasonably take it. Common formats include flavored sachets and powders, tablets and chewables, and liquid concentrates. Comparing products means comparing extract quantity per serving, not package size.
Cat's Claw products should not be confused with products built on other botanicals entirely. Uncaria tomentosa is not kratom (Mitragyna speciosa), contains no mitragynine and no 7-hydroxymitragynine, and sits in a different regulatory conversation. We break the comparison down properly in our article on the 7-OH scheduling action.
Testing: the part that actually separates products
Botanical supply chains are long, and material passes through many hands between a forest in Peru and a sealed pouch. Testing is how a buyer verifies what happened along the way. A credible product is tested by an accredited third-party laboratory — one with no financial stake in the outcome — and the results published as a Certificate of Analysis (COA) tied to a specific batch or lot number.
A meaningful COA covers identity (is this actually Uncaria tomentosa), potency (how much of the marker constituent is present), and contaminants (heavy metals, microbial counts, pesticide residues). The products we carry are third-party lab tested and made in the USA, with reports posted on our COA page.
Who these products are for
Cat's Claw products from this store are intended for adults 21 and over. They are not for use if you are pregnant or nursing. If you take prescription medication or have an existing health condition, talk to a qualified healthcare professional before using any botanical product — there are documented reasons to be careful, and we cover them candidly in our article on risks and side effects. Legality of any specific botanical product depends on its formulation and on applicable state and local law.*
For a shorter overview of the plant, see our Cat's Claw collection.
Frequently asked questions
Is Cat's Claw the same thing as kratom?
No. Cat's Claw is Uncaria tomentosa, in the family Rubiaceae. Kratom is Mitragyna speciosa, a Southeast Asian tree. They are different plants with different naturally occurring constituents. The products we carry contain no kratom, no mitragynine, and no 7-OH.
What part of the plant is used?
Primarily the inner bark of the woody stem. The root is used less frequently. Leaves are not the standard commercial material for this species.
Why do some labels say Uncaria guianensis instead?
Uncaria guianensis is a related Amazonian species in the same genus that shares the common name. It is a different species with a different chemical profile, so the Latin binomial on the label is the only reliable way to know which one you have.
What does "third-party tested" actually mean?
It means an independent, accredited laboratory with no ownership stake in the brand ran the analysis and issued a report against a specific batch. In-house testing by the manufacturer is not the same thing. Always check that the batch number on the COA matches the batch number on your package.
*Statements marked with an asterisk have not been evaluated by the U.S. Food and Drug Administration. Legality of any given product depends on its specific formulation and on applicable federal, state, and local law.
These statements have not been evaluated by the U.S. Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. For adults 21+. Consult a qualified healthcare professional before use.