Umckaloabo Root (Pelargonium reniforme): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Pelargonium reniforme work for respiratory infections?

Umckaloabo root contains active compounds such as coumarins, flavonoids, and proanthocyanidins. These constituents are believed to possess antimicrobial and immune-modulating properties. Specifically, the herb increases ciliary beat frequency in the respiratory tract, helping to clear mucus, while also inhibiting bacterial adherence to mucous membranes. Evidence for these mechanisms is largely preclinical (Level C), supporting its traditional use for respiratory infections rather than definitive clinical proof.

Can I take Umckaloabo with blood thinners?

No, you should avoid taking Umckaloabo if you are on anticoagulant therapy. The herb contains coumarins, which possess blood-thinning properties that can potentiate the effects of medications like warfarin or heparin. This interaction significantly increases the risk of bleeding and bruising. Patients on anticoagulant medication should consult their doctor before using any Pelargonium species products to ensure safety.

What is the recommended dosage for Umckaloabo tincture?

The standard adult dosage for Umckaloabo tincture is typically 20 to 30 drops taken three times daily. This recommendation is based on traditional usage patterns and available pharmacopoeial standards rather than extensive clinical trials. It is generally advised to take the tincture with water to minimize potential gastrointestinal upset. Users should strictly adhere to recommended dosages to avoid liver strain.

Is Umckaloabo safe during pregnancy?

No, Umckaloabo is considered unsafe during pregnancy and breastfeeding. The presence of coumarins poses potential risks, including the possibility of stimulating uterine contractions or affecting fetal development. Furthermore, the herb is contraindicated for individuals with liver disease. Women who are pregnant or nursing should avoid this herb and seek guidance from a qualified healthcare provider for alternative treatments.

What is Pelargonium reniforme used to treat?

Pelargonium reniforme is traditionally used in South African medicine to treat respiratory infections, tuberculosis, and diarrhea. It is often used interchangeably with Pelargonium sidoides for its antimicrobial and liver-protective properties. However, the current evidence level is rated C, indicating that while there is biological plausibility and historical use, robust clinical trials are limited. It should not replace standard medical treatment for serious conditions like tuberculosis.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 22 PubMed articles · model: gemma4:31b

Summary

Umckaloabo is a herbal medicine derived from the roots of Pelargonium species, including P. reniforme and P. sidoides, used traditionally in Southern Africa for respiratory and other conditions [PMID:17188477, PMID:17188480].

Background

Pelargonium reniforme and Pelargonium sidoides are closely related geranium species from Southern Africa that are morphologically similar and often confused [PMID:42081309]. They serve as traditional and phytomedicinal sources for the herbal medicine known as Umckaloabo [PMID:17188477].

Traditional uses

In South Africa, P. reniforme is used in folk medicine for the treatment of tuberculosis [PMID:40283948, PMID:31698813], diarrhoea [PMID:18983042], and as a repellent against Anopheles arabiensis mosquitoes [PMID:11317593].

Active compounds

The roots contain a diverse range of phenolic and polyphenolic compounds, including coumarins (such as scopoletin, 6,7,8-trihydroxycoumarin, and 8-hydroxy-5,6,7-trimethoxycoumarin), proanthocyanidins, and the diterpene reniformin [PMID:17188477]. Other identified constituents include gallic acid, methyl gallate, myricetin, quercitin-3-O-beta-d-glucoside, and various ellagitannins (pelargoniins A-E) [PMID:19191950, PMID:10975505, PMID:17964619].

Mechanism of action

Components of P. reniforme stimulate the killing of Mycobacterium species by macrophages without increasing the uptake of the bacteria [PMID:19191950]. The plant's polyphenols, particularly hydrolyzable tannins, exhibit significant antioxidant and radical scavenging activity [PMID:15264932, PMID:20731548].

Clinical evidence

Evidence DMycobacterium infections

Aqueous P. reniforme extracts stimulate macrophage killing of M. tuberculosis and M. fortuitum [PMID:19191950].

Evidence DAlcohol-induced liver damage

Aqueous root extract demonstrated significant antioxidant activity and effects on liver marker enzymes in Wistar rats [PMID:20731548].

Evidence DBacterial infections

Extracts and constituents (excluding catechin) showed antibacterial activity against various Gram-positive and Gram-negative bacteria [PMID:9434601].

Evidence BMosquito repellency

Alcohol plant extract of P. reniforme provided 63.3% protection against Anopheles arabiensis for three hours [PMID:11317593].

Evidence summary

The current evidence is primarily based on in vitro studies, animal models, and ethnobotanical reports, indicating potential antibacterial, immunomodulatory, and antioxidant properties, with limited clinical trial data regarding mosquito repellency.

PubMed sources

1.PMID: 19191950 (2009) — Components derived from Pelargonium stimulate macrophage killing of Mycobacterium species. · Journal of applied microbiology
2.PMID: 38235116 (2023) — Stevens' Cure (Umckaloabo)-the vindication of a patent medicine. · Frontiers in pharmacology
3.PMID: 17188477 (2007) — Fascinating metabolic pools of Pelargonium sidoides and Pelargonium reniforme, traditional and phytomedicinal sources of the herbal medicine Umckaloabo. · Phytomedicine : international journal of phytotherapy and phytopharmacology
4.PMID: 42081309 (2026) — Pelargonium sidoides DC. vs. Pelargonium reniforme (Andrews) Curtis - active constituents and medicinal effects. · Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti
5.PMID: 11830160 (2002) — O-Galloyl-C-glycosylflavones from Pelargonium reniforme.

Umckaloabo Root

Sources & Citations

Calculate a safe dose of Umckaloabo Root