# Rhatany (Krameria lappacea)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/rhatany
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-27
**Evidence Score:** 4 / 10
**Category:** South American
**Also Known As:** Krameria lappacea, Peruvian rhatany, Rhatany root, Mapato, Ratanhia, Krameria, Red ratany, Payta ratany

## Overview

Rhatany (Krameria lappacea) is a South American shrub containing tannins and phenolic compounds with demonstrated [antimicrobial](/ingredients/condition/immune-support) properties. The plant's bioactive compounds work through [oxidative stress](/ingredients/condition/antioxidant) mechanisms to inhibit bacterial growth and potentially interfere with cancer cell proliferation.

## Health Benefits

• May inhibit cancer cell growth through [oxidative stress](/ingredients/condition/antioxidant) mechanisms (in vitro evidence only - MCF-7 breast cancer cells showed dose-dependent cytotoxicity)
• Demonstrates antibacterial activity against Gram-positive bacteria including S. aureus and L. monocytogenes (in vitro studies)
• Traditional astringent properties for gastrointestinal disorders like chronic diarrhea and dysentery (historical use only, no clinical trials)
• Anti-hemorrhagic effects for conditions like menorrhagia and hematuria (traditional use only, no clinical evidence)
• Oral health support for stomatitis, gingivitis, and sore throat (traditional use only, no modern studies)

## Mechanism of Action

Rhatany's tannins and phenolic compounds exert [antimicrobial](/ingredients/condition/immune-support) effects by disrupting bacterial cell membranes and inhibiting protein synthesis in Gram-positive bacteria. The plant's phenolic constituents induce oxidative stress in cancer cells through [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) generation, leading to [mitochondrial](/ingredients/condition/energy) dysfunction. These compounds also demonstrate astringent properties by binding to proteins and mucous membranes.

## Clinical Summary

In vitro studies demonstrate rhatany's antibacterial activity against Staphylococcus aureus and Listeria monocytogenes with minimum inhibitory concentrations ranging from 0.5-2 mg/mL. Laboratory research on MCF-7 breast cancer cells showed dose-dependent cytotoxicity with IC50 values around 50-100 μg/mL after 48-hour treatment. Traditional use spans centuries in South American folk medicine for oral health and wound healing. However, human clinical trials are lacking, limiting evidence for therapeutic efficacy and optimal dosing protocols.

## Nutritional Profile

Rhatany root is not consumed as a food ingredient and thus lacks a conventional macronutrient/micronutrient profile in the dietary sense. Its bioactive composition is well-characterized phytochemically: PRIMARY BIOACTIVES - Tannins constitute the dominant fraction at approximately 8-20% dry weight of the root, predominantly proanthocyanidins (condensed tannins) including rhatanin, epicatechin units, and oligomeric proanthocyanidins (OPCs); hydrolyzable tannins are present in smaller quantities. Lignans are a notable secondary class, with ratanhiaphenol I, II, and III (benzofuran neolignans) identified as characteristic compounds specific to Krameria species. Phlobaphenes (rhatany-red, a polymerized tannin-derived pigment) contribute to the characteristic red-brown coloration at roughly 2-5% dry weight. PHENOLIC COMPOUNDS - Gallic acid and its derivatives are present; catechins and epicatechins serve as tannin building blocks. Starch content in the root reaches approximately 30-40% dry weight, representing the primary carbohydrate fraction, though this is largely irrelevant given non-food use. Gums and resins contribute approximately 6-10%. Calcium oxalate crystals are present in root tissue. BIOAVAILABILITY NOTES - The high tannin content (8-20%) means that if ingested, protein-binding capacity would significantly reduce bioavailability of both the tannins themselves and co-ingested nutrients; condensed tannins in this concentration range are poorly absorbed systemically. Ratanhiaphenols are lipophilic neolignans with moderate predicted membrane permeability. Micronutrient and vitamin content has not been characterized in published literature, as the root is used exclusively in medicinal/cosmetic contexts at sub-gram doses, making dietary micronutrient contribution negligible.

## Dosage & Preparation

No clinically studied human dosages are available. In vitro studies used root extracts at 250-1000 μg/mL for anticancer effects. Standardization details for tannin or proanthocyanidin content have not been established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Rhatany is generally considered safe when used topically in traditional preparations, though oral consumption safety data is limited. High tannin content may cause gastrointestinal irritation, nausea, or constipation with excessive internal use. The herb may interact with iron supplements and certain medications due to tannin binding properties. Pregnant and breastfeeding women should avoid use due to insufficient safety data and potential uterine stimulant effects.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses have been conducted on rhatany. Available evidence is limited to in vitro studies showing anticancer effects on MCF-7 and A549 cell lines (IC50 64.81-142.27 μg/mL) and antibacterial activity against various pathogens.

## Historical & Cultural Context

Rhatany root has been used in South American traditional medicine for centuries as an astringent for gastrointestinal disorders, hemorrhages, and oral conditions. Historical records dating to at least the 19th century document its value for [anti-inflammatory](/ingredients/condition/inflammation), anti-hemorrhagic, tonic, and healing properties.

## Synergistic Combinations

Slippery elm, marshmallow root, goldenseal, myrrh, witch hazel

## Frequently Asked Questions

### What is the recommended dosage for rhatany supplements?

No standardized dosage exists due to limited clinical research. Traditional preparations typically use 1-2 grams of dried root per cup of tea, while topical tinctures contain 10-20% rhatany extract.

### Can rhatany help with oral health problems?

Traditional use supports rhatany for gingivitis and mouth sores due to its astringent tannins. However, clinical studies on oral health benefits are lacking, and evidence remains anecdotal.

### Does rhatany interact with blood thinning medications?

Rhatany's high tannin content may theoretically affect medication absorption and blood clotting. Consult healthcare providers before combining with warfarin or other anticoagulants.

### Is rhatany effective against antibiotic-resistant bacteria?

In vitro studies show activity against standard bacterial strains, but research on antibiotic-resistant organisms is limited. Current evidence doesn't support rhatany as a replacement for conventional antibiotics.

### How long does rhatany take to show antimicrobial effects?

Laboratory studies demonstrate bacterial inhibition within 24-48 hours of exposure. However, real-world effectiveness timing in humans remains unstudied and may vary significantly based on application method and concentration.

### Is rhatany safe during pregnancy and breastfeeding?

There is insufficient clinical evidence regarding rhatany's safety during pregnancy and breastfeeding, so it is generally recommended to avoid supplementation during these periods unless under healthcare provider supervision. Traditional use as an astringent for gastrointestinal issues does not establish safety for pregnant or nursing women. Pregnant and breastfeeding individuals should consult their healthcare provider before using rhatany supplements.

### What does current clinical research show about rhatany's anticancer potential?

Current evidence for rhatany's anticancer effects is limited to in vitro laboratory studies, where extracts demonstrated dose-dependent cytotoxicity against MCF-7 breast cancer cells through oxidative stress mechanisms. These preliminary findings have not been validated in human clinical trials or animal models, so any anticancer claims remain speculative and unproven. More rigorous research is needed before rhatany can be recommended as an anticancer agent.

### Who should avoid rhatany supplements, and are there safety concerns for specific populations?

Individuals with bleeding disorders, those taking anticoagulant medications, pregnant women, and nursing mothers should avoid rhatany due to limited safety data and potential interactions. People with severe gastrointestinal conditions should consult a healthcare provider before use, as rhatany's astringent properties may affect medication absorption or condition management. Children and the elderly should only use rhatany under professional medical guidance.

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