Hermetica Superfood Encyclopedia
The Short Answer
Una de Gato's primary bioactives—pentacyclic oxindole alkaloids (POA) such as pteropodine, isopteropodine, and mitraphylline—modulate immunity by inhibiting NF-κB activation, suppressing TNF-alpha and IL-1 cytokines, and blocking COX-1/COX-2 enzyme activity, while quinovic acid glycosides drive apoptosis in cancer cell lines. In a small human pilot study, 350 mg daily of aqueous extract for six weeks elevated white blood cell counts by approximately 9%, and preclinical data show that mitraphylline at 30 mg/kg reduces TNF-alpha by 50% and IL-1alpha/beta by 70% in animal models.
CategoryHerb
GroupAmazonian
Evidence LevelPreliminary
Primary Keyworduna de gato benefits
Cat's Claw — botanical close-up
Health Benefits
**Immunomodulation**
Aqueous extracts containing pentacyclic oxindole alkaloids stimulate white blood cell production and activity, increase lysozyme secretion, enhance antibody levels, and boost melanomacrophage function, supporting a broadly activated innate immune response.
**Anti-Inflammatory Activity**
Quinovic acid glycosides and oxindole alkaloids together inhibit NF-κB activation at 500 μg/ml in Jurkat T cells and suppress iNOS gene expression and nitrite formation at 50–200 μg/ml, reducing LPS-induced pro-inflammatory cytokine production by 70–75%.
**Potential Anticancer Properties**
POA-rich extracts demonstrate selective cytotoxicity to several cancer cell lines while sparing normal cells at moderate doses; quinovic acid glycosides specifically induce apoptosis in T24 bladder cancer cells through direct caspase pathway engagement.
**Antioxidant and Cytoprotection**
Proanthocyanidins including epicatechin, procyanidins B1/B2/B4, and cinchonain neutralize reactive oxygen species, while the extract attenuates peroxynitrite-induced apoptosis at 100 μg/ml, protecting cellular integrity under oxidative stress conditions.
**Platelet Aggregation Inhibition**
Indole alkaloids rhynchophylline and isorhynchophylline antagonize platelet-activating factor (PAF) and thromboxane receptor signaling, reducing platelet aggregation and offering potential cardiovascular protection.
**Antiviral and Antimicrobial Support**
In silico molecular docking and molecular dynamics simulations identify speciophylline, cadambine, and proanthocyanidin B2 as strong binding candidates to the SARS-CoV-2 3CLpro cysteine protease, suggesting a mechanism for antiviral activity warranting further investigation.
**Gastrointestinal and Connective Tissue Support**
Traditional and preliminary evidence indicates that COX inhibition and anti-inflammatory alkaloids reduce intestinal inflammation, while beta-sitosterol and oleanolic acid contribute to mucosal integrity and connective tissue repair.
Origin & History
Natural habitat
Uncaria tomentosa is a woody climbing vine native to the tropical rainforests of South and Central America, particularly the Amazonian regions of Peru, Brazil, Colombia, and Bolivia, thriving at elevations between 200–800 meters in humid, dense jungle canopy. The plant is named for its distinctive hook-like thorns resembling cat claws, which it uses to anchor itself to host trees and can grow to lengths exceeding 30 meters. Traditional cultivation centers around the Chanchamayo and Nevati river valleys of Peru's Junín region, where indigenous communities have harvested the inner bark and root bark for centuries using sustainable, rotational methods.
“Una de Gato has been integral to Amazonian ethnomedicine for at least several centuries, with documented use by indigenous peoples of Peru—including communities near Chanchamayo, Nevati, and Puerto Bermez in the Junín department—who employed decoctions of the inner bark to treat inflammation, wounds, immune disorders, cancer, arthritis, and infections including what they described as AIDS-like wasting conditions. The vine holds spiritual and ceremonial significance in some Amazonian traditions, where its preparation and administration were ritually governed by healers (curanderos), and the preparation method—boiling bark in water for an extended period—was considered essential to extracting the plant's curative spirit alongside its chemical constituents. Scientific investigation began in earnest in the 1980s when European researchers, particularly from Austria and Germany, isolated and characterized the oxindole alkaloid fraction and documented immunomodulatory activity, triggering a rapid expansion of commercial interest and export from Peru. The plant's cultural cachet as an Amazonian anti-cancer and immune tonic drove widespread adoption in European and North American herbal markets through the 1990s and 2000s, with Peru subsequently regulating wild harvest to prevent overharvesting of wild populations.”Traditional Medicine
Scientific Research
The evidence base for Una de Gato consists predominantly of in vitro cell studies and small-scale animal experiments, with very limited controlled human trial data, placing it firmly in the preliminary-to-moderate evidence tier. The most cited human data involve a pilot study of only four healthy volunteers receiving 350 mg/day aqueous extract for six weeks, which demonstrated a ~9% increase in white blood cell counts—an outcome replicated in subsequent slightly larger follow-up cohorts but still lacking large randomized controlled trial confirmation. Preclinical evidence is more robust: dose-dependent anti-inflammatory effects (mitraphylline 30 mg/kg, i.p.) reducing TNF-alpha by 50% and IL-1 by 70% in murine models are well-documented, and in vitro NF-κB and COX inhibition studies provide mechanistic plausibility, but translation to standardized human clinical outcomes remains largely unvalidated. No large multicenter RCTs with pre-registered endpoints, standardized extract doses, and peer-reviewed effect sizes have been published as of the available literature, and the heterogeneity of extract types (POA vs. TOA vs. aqueous vs. hydroalcoholic) makes cross-study comparison difficult.
Preparation & Dosage
Traditional preparation
**Traditional Decoction**
20 g of sliced inner root bark in 1 liter of water for 45 minutes; strain and consume as a tea, traditionally used 1–3 times daily for therapeutic purposes by Amazonian indigenous communities
Boil .
**Aqueous Extract (Standardized)**
350 mg/day in the primary human pilot study; typical commercial capsule doses range from 250–500 mg standardized aqueous extract, taken 1–2 times daily with meals
**Hydroalcoholic (Ethanolic) Extract**
300–600 mg standardized extract reported in commercial preparations
Contains approximately 5.61% total oxindole alkaloids; doses of .
**POA-Standardized Extract**
Standardized to 90–110% of labeled pentacyclic oxindole alkaloid content on a dried weight basis; preferred over TOA-dominant extracts for immunological applications per some researchers.
**Bark Powder (Crude)**
1–4 g per day encapsulated root bark; lower bioavailability of alkaloids than standardized extracts due to variable alkaloid concentration (0
15–4.60% in raw bark).
**Timing and Cycling**
No formal cycling protocol established; traditional and modern use suggests continuous use for 4–8 weeks followed by assessment; take with food to reduce potential gastrointestinal upset.
Nutritional Profile
Una de Gato inner bark is not a significant source of macronutrients (proteins, fats, or carbohydrates) in supplemental doses and is consumed primarily for its phytochemical content rather than nutritional value. Total oxindole alkaloids range from 0.15–4.60% in crude dried bark, with POA-enriched hydroalcoholic extracts reaching up to 5.61%; aqueous extracts yield approximately 0.26% alkaloids, reflecting the differential solubility of these nitrogen-containing compounds. The triterpene fraction includes quinovic acid glycosides (tomentosides), ursolic acid, and oleanolic acid, while sterols beta-sitosterol and stigmasterol are present in minor quantities. The polyphenol fraction—comprising epicatechin, procyanidins A1/B1/B2/B4, and cinchonain—contributes antioxidant activity that is water-extractable and bioavailable through standard decoction; flavonoids and quinones are also present but at lower concentrations not yet precisely quantified in standardized analytical studies. Bioavailability of alkaloids is enhanced in hydroalcoholic preparations relative to aqueous decoctions due to greater organic solubility of POA compounds.
How It Works
Mechanism of Action
Pentacyclic oxindole alkaloids (POA), particularly mitraphylline and isopteropodine, suppress nuclear factor-kappa B (NF-κB) activation—nearly completely at 500 μg/ml—thereby downregulating transcription of pro-inflammatory genes encoding TNF-alpha, IL-1alpha, IL-1beta, and inducible nitric oxide synthase (iNOS), resulting in measurable reductions in nitrite formation and cytokine output in macrophage and T-cell models. Quinovic acid glycosides exert cytostatic and pro-apoptotic effects in malignant cell lines, including T24 bladder carcinoma cells, via direct interference with cell cycle progression and activation of intrinsic apoptotic cascades, while leaving non-cancerous cell lines largely unaffected at equivalent concentrations. Rhynchophylline and isorhynchophylline inhibit platelet-activating factor and block thromboxane A2 receptor signaling, reducing platelet aggregation in a receptor-competitive manner. The proanthocyanidin fraction—comprising epicatechin, cinchonain, and procyanidins A1/B1/B2/B4—scavenges peroxynitrite and superoxide radicals, providing a complementary antioxidant mechanism that synergizes with the alkaloid-mediated cytoprotective effects.
Clinical Evidence
Human clinical investigation of Uncaria tomentosa remains in early stages, with the most substantive data derived from small unblinded pilot studies. A six-week pilot in healthy adults using 350 mg/day aqueous extract showed approximately 9% elevation in circulating leukocyte counts, supporting traditional immunostimulatory claims, though the absence of placebo controls and small sample size (n=4) limits conclusions. Preclinical animal and cell culture models consistently demonstrate dose-dependent suppression of NF-κB, TNF-alpha, IL-1, and COX activity, alongside selective pro-apoptotic effects in cancer cell lines, but these findings have not yet been confirmed in adequately powered phase II or III human trials. Confidence in the current clinical evidence is low to moderate; the totality of data supports plausibility and traditional use, but prescriptive clinical recommendations await rigorous RCT-level confirmation.
Safety & Interactions
At typical supplemental doses (250–500 mg/day standardized extract), Una de Gato is generally well-tolerated, with mild gastrointestinal side effects—nausea, diarrhea, and abdominal discomfort—the most frequently reported adverse events; in vitro data confirm that POA-rich and crude aqueous extracts become cytotoxic to normal cells only at concentrations substantially exceeding therapeutic ranges. Clinically significant drug interactions include potentiation of anticoagulant and antiplatelet agents (warfarin, clopidogrel, aspirin) due to rhynchophylline- and isorhynchophylline-mediated platelet aggregation inhibition, and theoretical additive effects with NSAIDs and corticosteroids via NF-κB and COX pathway overlap—caution and dose reduction of concurrent medications is advisable. Uncaria tomentosa is contraindicated during pregnancy based on historical use as an abortifacient and animal data suggesting uterotonic properties; it should also be avoided during lactation due to insufficient safety data. The European Medicines Agency (EMA) has assessed standardized preparations as acceptably safe for short-term adult use, but no maximum tolerated dose in humans has been formally established; immunosuppressed individuals and organ transplant recipients should consult a physician before use due to immunostimulatory activity.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Uncaria tomentosaCat's ClawUña de GatoSaventaroVilcacoraLife-giving vine of Peru
Frequently Asked Questions
What is Una de Gato used for?
Una de Gato (Uncaria tomentosa) is used primarily as an immunomodulator and anti-inflammatory agent, supported by traditional Amazonian medicine and preliminary modern research. Its pentacyclic oxindole alkaloids inhibit NF-κB signaling and suppress pro-inflammatory cytokines (TNF-alpha, IL-1beta), while quinovic acid glycosides show pro-apoptotic activity in cancer cell lines, making it a candidate for immune support, inflammation management, and adjunctive cancer research.
What is the recommended dosage of Cat's Claw?
The most clinically studied human dose is 350 mg/day of standardized aqueous extract, used in a six-week pilot study demonstrating ~9% increases in white blood cell counts. Commercial standardized POA-rich extracts are typically taken at 250–500 mg once or twice daily with food; traditional Amazonian preparation involves boiling 20 g of inner root bark in 1 liter of water for 45 minutes and consuming the decoction as tea.
Does Cat's Claw interact with any medications?
Yes—Una de Gato inhibits platelet aggregation via rhynchophylline and isorhynchophylline, creating a clinically relevant interaction with anticoagulants (warfarin), antiplatelet drugs (clopidogrel, aspirin), and blood thinners, potentially increasing bleeding risk. Its NF-κB and COX-1/COX-2 inhibitory activity may also produce additive or competitive effects when combined with NSAIDs, corticosteroids, or other immunomodulatory therapies, and immune-suppressed patients on transplant medications should avoid it due to immunostimulatory properties.
Is Una de Gato safe during pregnancy?
Una de Gato is contraindicated during pregnancy; the plant has historical use as an abortifacient in Amazonian traditional medicine and animal data suggest potential uterotonic activity. It should also be avoided during breastfeeding due to a complete lack of safety data in these populations, and any use during reproductive years should occur only under direct medical supervision.
What is the difference between POA and TOA Cat's Claw extracts?
Pentacyclic oxindole alkaloids (POA)—including pteropodine, isopteropodine, mitraphylline, and speciophylline—are considered the primary immunologically active compounds in Uncaria tomentosa, and POA-standardized extracts are preferred for immune and anti-inflammatory applications. Tetracyclic oxindole alkaloids (TOA) have been proposed by some researchers to antagonize the effects of POA at immune receptors, leading to commercial products specifically standardized to high POA content with minimal TOA; however, the clinical significance of this POA/TOA ratio distinction in humans has not been definitively confirmed in large controlled trials.
What is the difference between alkaloid content in wild-harvested vs. cultivated Una de Gato?
Wild-harvested Una de Gato from Peru typically contains higher concentrations of pentacyclic oxindole alkaloids (POA), the primary active compounds responsible for immunomodulation, compared to cultivated varieties. Cultivated plants may be more consistent in quality and sustainability but often require standardized extraction to match the potency of wild sources. The growing conditions, altitude, and soil composition in native Peruvian rainforests contribute to superior alkaloid profiles in wild specimens.
Who should avoid taking Una de Gato supplements?
Individuals with autoimmune conditions such as lupus, rheumatoid arthritis, or multiple sclerosis should consult a healthcare provider before using Una de Gato, as its immune-stimulating properties may potentially exacerbate autoimmune responses. People scheduled for organ transplants should avoid it due to its immunomodulatory effects, which could interfere with immunosuppressive medications. Additionally, those with known hypersensitivity to plants in the Rubiaceae family should exercise caution.
How does Una de Gato's anti-inflammatory mechanism differ from conventional NSAIDs?
Unlike NSAIDs that inhibit cyclooxygenase enzymes, Una de Gato reduces inflammation by blocking NF-κB activation through its quinovic acid glycosides and oxindole alkaloids, addressing inflammatory pathways at the transcription factor level. This mechanism supports sustained immune modulation rather than symptomatic pain relief alone, potentially offering complementary benefits alongside or as an alternative to conventional anti-inflammatory drugs. The botanical's multi-target approach may reduce risk of gastrointestinal side effects associated with NSAID use.
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