What is Pelargonium?
Pelargonium (Pelargonium sidoides, and the closely related Pelargonium reniforme) is a flowering perennial plant native to South Africa, belonging to the Geraniaceae family. It shares the same genus as the common ornamental geraniums found in gardens, but the medicinal species is quite different. The roots of Pelargonium sidoides have been used for centuries by native South African populations as a traditional remedy for respiratory and gastrointestinal infections. About 120 years ago, an Englishman named Charles Henry Stevens brought the root to Europe, praising it as a remedy for tuberculosis, which is how the traditional name "Umckaloabo" entered Western herbal medicine.
Today, Pelargonium is one of the most extensively researched herbal remedies for acute respiratory infections. Most of the clinical evidence centers on a specific standardized root extract known as EPs 7630 (the active ingredient in products like Umckaloabo), which has been studied in dozens of randomized controlled trials and multiple meta-analyses.
Common Names: Pelargonium, African Geranium, Umckaloabo, Cape Pelargonium, Kalwerbossie, Rabassam, South African Geranium, EPs 7630 (the standardized extract)
Important Clarification: Do not confuse Pelargonium sidoides with rose geranium essential oil or with spotted geranium (Geranium maculatum). These are different plants with different uses. The medicinal preparations come specifically from the roots of Pelargonium sidoides (and sometimes Pelargonium reniforme).
Primary Active Compounds:
Highly oxygenated coumarins (benzopyranones): Including umckalin, a signature compound of the plant; these substituted coumarins carry hydroxyl and methoxyl groups and are thought to contribute to the immunomodulatory and antimicrobial effects
Prodelphinidins and proanthocyanidins: Oligomeric and polymeric polyphenols that provide antioxidant and antibacterial activity
Gallic acid and its derivatives: Contributing antimicrobial and anti-inflammatory effects
Tannins: Provide astringent and antimicrobial properties
Flavonoids and phenolic acids: Additional antioxidant support
Sesquiterpenes: Among the more abundant constituents in the root
Minerals, carbohydrates, peptides, and purine derivatives: Present in the whole-root extract
Key Note on Standardization: The vast majority of research uses the standardized ethanolic extract EPs 7630, which keeps the chemical profile consistent from batch to batch. Generic "pelargonium root" products may vary significantly in potency and composition, so when the research findings are cited, they generally apply to the standardized extract rather than to any pelargonium product on the shelf.
Primary Functions & Benefits
Respiratory Infection Support (Primary Use):
Reduces the severity and duration of acute bronchitis symptoms
Eases cough intensity and frequency, particularly when started early
Helps relieve common cold symptoms and may shorten recovery time
Supports recovery from acute rhinosinusitis (sinus infections)
Helps with acute tonsillopharyngitis (sore throat) of non-streptococcal origin
May reduce the number of sick days and help people return to work sooner
Reduces reliance on antibiotics for uncomplicated respiratory infections
May reduce the need for fever and pain medication (like paracetamol) in children
Antimicrobial Activity:
Prevents bacteria from adhering to and penetrating the cells lining the respiratory tract (anti-adhesion effect)
Shows direct antibacterial activity against several respiratory pathogens including group A Streptococcus
Inhibits Helicobacter pylori adhesion to the stomach lining
Demonstrates antiviral activity against a broad panel of respiratory viruses in laboratory studies (influenza, parainfluenza, respiratory syncytial virus, rhinovirus, coxsackievirus, and certain coronaviruses)
Immune System Modulation:
Stimulates the body's own innate immune defenses
Increases the activity of macrophages (immune cells that engulf pathogens)
Enhances phagocytosis, oxidative burst, and intracellular killing of pathogens by immune cells
Stimulates the release of interferons, which help the body fight viruses
Increases natural killer cell activity
Promotes production of protective cytokines including tumor necrosis factor alpha and nitric oxide
Airway & Mucus Support:
Increases the beat frequency of the cilia (tiny hair-like structures) that clear mucus from the airways
Has secretolytic (mucus-thinning) properties that help clear congestion
Supports the natural clearance of pathogens from the respiratory tract
COPD Support:
May reduce the frequency of COPD flare-ups (exacerbations) when used alongside standard treatment
May reduce the need for antibiotics in people with moderate to severe COPD
Additional Areas of Research Interest:
Immune support for athletes after intense exercise (modulation of secretory IgA and inflammatory markers)
Potential activity against certain other pathogens in laboratory settings
Ongoing investigation into antiviral applications
Recommended Dosages
Standardized Liquid Extract (EPs 7630):
Adults: 30 drops (approximately 1.5 mL) taken three times daily, for a total of about 4.5 mL per day
Sinusitis protocols: Some studies used 60 drops (3 mL) three times daily for more stubborn sinus infections
Typical liquid range: 1.2 to 4.2 mL per day depending on age and product
Standardized Tablets/Dry Extract:
Adults: 20 mg tablet taken three times daily (60 mg per day is a common regimen)
Typical dry extract range: 20 to 60 mg per day depending on age and product
Children (Use Only Under Healthcare Provider Guidance):
Dosing depends on age and weight and should be determined by a healthcare provider
Pediatric formulations (drops and syrups) exist and have been studied specifically in children
Generally used only for short durations (about one week) in children
Duration of Use:
Acute infections: Typically 7 to 10 days, or until symptoms resolve
Best results: Start within 48 hours of symptom onset
Extended safety: The standardized extract has been studied as likely safe for up to 24 weeks in adults, though it is generally intended for short-term use during acute illness
Children: Typically limited to about one week of use
Important Dosing Note:
Pelargonium is designed as a short-term remedy for acute respiratory illness, not a daily maintenance supplement. It is taken during an illness and then discontinued once you recover. This is different from many of the daily vitamins, minerals, and herbs that are meant for ongoing use.
Timing & Administration
Best Time to Take:
Start early: The single most important timing factor is starting within 48 hours of feeling sick; earlier treatment produces better outcomes
Spread throughout the day: The three-times-daily dosing is best spaced out (for example, morning, midday, and evening) to maintain consistent levels of the active compounds
Consistency matters: Take each dose at roughly the same times each day for the duration of your illness
With or Without Food:
Can generally be taken with or without food
Taking with a small amount of food or a full glass of water may reduce the chance of stomach upset, which is the most common side effect
The liquid extract can be added to a small amount of water or juice to make the taste more palatable, especially for children
Administration Tips:
Liquid drops: Measure carefully using the dropper provided; the alcohol base gives it a distinctive taste
Tablets: Swallow whole with water
Syrup formulations: Often more palatable for children and available in age-appropriate concentrations
Shake liquid preparations before use if directed on the label
Onset of Effects:
The time to onset of noticeable improvement is typically shorter than placebo in clinical trials
Symptom improvement generally becomes apparent within the first few days of consistent use
Full symptom resolution for acute bronchitis is often measured over a 7-day treatment course
Because it works partly by supporting your immune response and clearing pathogens, the benefit builds over the days of treatment rather than providing instant relief
Course Completion:
Continue for the full recommended course (usually 7 to 10 days) even if you start feeling better, to support complete recovery
If symptoms worsen or do not improve after several days, or if you develop high fever, difficulty breathing, or other concerning symptoms, seek medical evaluation rather than continuing to self-treat
How Pelargonium Works
Mechanisms of Action:
Anti-adhesion effect: One of the most distinctive mechanisms is preventing bacteria (such as group A Streptococcus) from attaching to the epithelial cells that line the respiratory tract; if pathogens cannot adhere, they cannot establish an infection or penetrate the tissue
Immune stimulation (immunomodulation): Rather than directly killing all pathogens like an antibiotic, Pelargonium primarily works by activating and mobilizing the body's own immune defenses, including macrophages, natural killer cells, and the release of interferons and protective cytokines
Enhanced phagocytosis: Improves the ability of immune cells to engulf and destroy pathogens, along with boosting their oxidative burst and intracellular killing capacity
Interferon production: Stimulates the release of interferons, signaling molecules that help neighboring cells resist viral infection
Direct antiviral activity: Laboratory studies show the extract can interfere with the replication and cell-binding of several respiratory viruses, partly by modulating the viral binding proteins on the surface of bronchial cells
Increased ciliary beat frequency: Speeds up the movement of the cilia lining the airways, which helps sweep mucus and trapped pathogens out of the respiratory tract more efficiently
Secretolytic action: Helps thin and mobilize mucus so it can be cleared more easily
Antioxidant activity: The polyphenolic compounds (prodelphinidins and proanthocyanidins) provide free radical scavenging that supports tissue during infection
The Big Picture:
Pelargonium is best understood as a multi-target herbal remedy. It does not rely on a single powerful mechanism but instead combines mild direct antimicrobial and antiviral effects with a broader immune-supporting and airway-clearing action. This combination is why it can be helpful across a range of upper and lower respiratory infections without being a true antibiotic.
Synergistic Supplements
Take WITH Pelargonium:
Vitamin C: Complementary immune support during respiratory infections
Vitamin D: Supports immune function and respiratory health; interestingly, Pelargonium extract has been shown to upregulate the vitamin D receptor in bronchial cells
Zinc: Well-established support for immune function and reducing cold duration
Elderberry (Sambucus): Traditional antiviral immune support for colds and flu
Echinacea: Another popular immune-supporting herb for respiratory infections (though monitor total immune-stimulating load)
Honey: Natural cough soother, especially for nighttime cough (not for children under 1 year)
N-acetylcysteine (NAC): Mucus-thinning support that complements the secretolytic action
Probiotics: Support overall immune resilience, particularly if antibiotics are also being used
Beneficial Combinations:
Acute cold and cough protocol: Pelargonium + vitamin C + zinc + honey
Immune resilience stack: Pelargonium + vitamin D + zinc + elderberry
Congestion and mucus support: Pelargonium + NAC + steam inhalation + adequate hydration
A Note on Combining Immune Stimulants:
Because Pelargonium actively stimulates the immune system, stacking it with several other strong immune-stimulating herbs at once is usually unnecessary. Pick a focused combination rather than layering many immune stimulants together, and be especially cautious if you have an autoimmune condition (see the caution section below).
Interactions & What NOT to Take
Use Caution With:
Blood thinners (Warfarin/Coumadin and other anticoagulants): Because Pelargonium is a coumarin-containing extract, there has been theoretical concern about interaction with coumarin-type anticoagulants; a rat study found no effect on blood coagulation parameters or on the pharmacokinetics of warfarin, and clinical trials have generally excluded people with bleeding tendencies as a precaution; still, if you take blood thinners, consult your healthcare provider before use
Antiplatelet medications: Same theoretical bleeding-related caution applies
Immunosuppressant medications: Because Pelargonium stimulates immune activity, it could theoretically counteract drugs designed to suppress the immune system; use only with medical guidance
Other herbal cold remedies: Combining multiple herbal respiratory products at once can make it hard to interpret which is helping and may increase the chance of side effects
Bleeding Precautions:
People with an increased tendency to bleed, especially nasal or gingival (gum) bleeding, were excluded from safety studies as a precaution
If you have a bleeding disorder or are prone to nosebleeds, discuss with your provider first
Important Note on Interactions:
Unlike some herbs, Pelargonium does not have a large list of confirmed, clinically significant drug interactions. Most cautions are precautionary and based on its coumarin content and immune-stimulating properties rather than on documented dangerous interactions. Nonetheless, if you are on chronic medication, particularly blood thinners or immunosuppressants, a quick check with your healthcare provider is wise.
Who Should Take Pelargonium
Ideal Candidates:
Adults with acute bronchitis who do not require antibiotics
People with a common cold looking for evidence-based symptom relief
Those with acute rhinosinusitis (sinus infection) of viral or mild bacterial origin
People with non-streptococcal sore throat (tonsillopharyngitis)
Individuals seeking a non-antibiotic option for uncomplicated respiratory infections
People who want to potentially reduce the duration of illness and return to normal activities sooner
Adults with moderate to severe COPD looking to reduce flare-ups (as an add-on to standard treatment, under medical supervision)
Anyone wanting to support their immune response at the first sign of a respiratory infection
Specific Populations:
Adults who catch frequent colds and want a short-course remedy on hand
Parents seeking a studied herbal option for children's respiratory infections (under provider guidance)
People trying to avoid unnecessary antibiotic use for viral infections
Active individuals and athletes prone to respiratory infections after intense training
Who Should AVOID or Use Caution
Contraindications:
People with known allergy to Pelargonium or geranium-family plants: Allergic and hypersensitivity reactions, though rare, are documented
Pregnant women: There is not enough reliable safety information; the general recommendation is to avoid use during pregnancy
Breastfeeding women: Insufficient safety data; best to avoid
Children under 3 (or under age guidance on the product): Use only if specifically directed by a healthcare provider
People with active liver disease: Given the theoretical concern about coumarins and rare reports of liver issues, those with existing liver disease should avoid use unless a clinician advises otherwise
Use Caution:
People with autoimmune conditions (multiple sclerosis, lupus, rheumatoid arthritis, and others): Because Pelargonium stimulates immune activity, it could theoretically worsen autoimmune conditions; consult your provider before use
Those taking blood thinners or with bleeding tendencies: See the interactions section
People with a history of liver problems: Monitor for any signs of liver trouble and discontinue if they appear
Anyone on immunosuppressant therapy: Use only with medical guidance
Watch For Signs of Liver Trouble:
Although large pharmacovigilance reviews have generally NOT found clear evidence that Pelargonium causes liver injury (many initially suspected cases were later attributed to other causes such as concurrent medications, infections, or pre-existing liver disease), regulatory agencies still recommend caution. Stop use and seek medical advice if you notice dark urine, yellowing of the eyes or skin (jaundice), unusual fatigue, or right-sided abdominal pain.
Benefits of Taking Pelargonium
Evidence-Based Benefits:
Statistically significant reduction in acute bronchitis symptom severity across multiple randomized controlled trials
Meta-analysis evidence for reduced cough intensity and improved quality of life in acute bronchitis and common cold
Meta-analysis evidence for fewer sick days and faster return to work in adults with acute bronchitis
Effective for acute rhinosinusitis symptom relief in placebo-controlled trials
Recognized by the European Respiratory Society as a natural remedy for symptoms of acute bronchitis
Reduced need for fever and pain medication in children with respiratory infections
Reduced COPD exacerbations when added to standard treatment
Well-documented safety profile in clinical trials, with side effects generally mild and comparable to placebo
A genuine non-antibiotic option, helping reduce unnecessary antibiotic use
Quality of Life Improvements:
Less disruptive coughing, including improved sleep during illness
Faster recovery and return to work or school
A studied alternative for people who prefer to avoid or delay antibiotics for viral illness
Peace of mind from using one of the better-researched herbal respiratory remedies
Potential Negatives & Side Effects
Common Side Effects (Generally Mild):
Stomach upset or gastrointestinal discomfort (the most frequently reported side effect)
Nausea
Diarrhea or, less commonly, constipation
Mild nervous system effects (such as dizziness) reported occasionally
Less Common Side Effects:
Allergic reactions, including skin rash, itching, or hives
Nosebleeds or gum bleeding (reported rarely; part of why bleeding-prone individuals are cautioned)
Ear and labyrinth-related complaints reported occasionally in pharmacovigilance data
Rare but Serious:
Hypersensitivity/anaphylaxis: Rare, but possible in allergic individuals; seek immediate care for difficulty breathing, throat swelling, or severe reaction
Liver injury: A small number of case reports historically raised concern, but detailed causality assessments found little to no convincing evidence that Pelargonium itself was the cause in most cases; regulatory warnings remain out of caution
Quality & Contamination Issues:
Product quality varies; the strongest evidence applies specifically to the standardized EPs 7630 extract
Generic pelargonium products may not match the studied potency or composition
Some liquid preparations have an alcohol (ethanol) base, which matters for those avoiding alcohol or giving it to children
Look for reputable manufacturers and standardized preparations
Adverse Events in Clinical Studies:
Across the trials, only minor and transient adverse events were typically recorded
No serious adverse events occurred in many of the key bronchitis trials
Overall tolerability has been rated very good by patients in multiple studies
Deficiency Symptoms
Note: Pelargonium is not an essential nutrient, so there are no deficiency symptoms. It is a therapeutic herbal remedy used during specific illnesses rather than a nutrient the body requires. This section instead covers the situations where Pelargonium may be worth reaching for.
Conditions That May Benefit From Pelargonium:
Acute bronchitis with cough, chest discomfort, and mucus
Common cold with cough, congestion, and general symptoms
Acute sinus infections (rhinosinusitis) with facial pressure, headache, and nasal discharge
Sore throat (non-streptococcal tonsillopharyngitis)
Frequent respiratory infections where a non-antibiotic option is desired
COPD with recurrent flare-ups (as an add-on under medical supervision)
Signs You Might Reach For It:
You feel a respiratory infection coming on within the last 24 to 48 hours
You have a cough and chest congestion but do not have signs of a serious bacterial infection requiring antibiotics
You want to potentially shorten the duration of a cold or bronchitis
You are looking to reduce reliance on antibiotics for viral respiratory illness
Your doctor has recommended a natural option to help reduce COPD flare-ups
Toxicity Symptoms
Pelargonium (standardized EPs 7630 extract) has a good safety profile at recommended doses, and true toxicity is uncommon. Animal studies using very high doses did not demonstrate significant organ toxicity.
Signs of Excessive Use or Adverse Reaction:
Significant gastrointestinal distress (nausea, vomiting, diarrhea)
Signs of an allergic reaction (rash, itching, swelling, difficulty breathing)
Signs of possible liver involvement (dark urine, jaundice, unusual fatigue, upper right abdominal pain)
Unusual or excessive bleeding (nosebleeds, gum bleeding)
On the Liver Safety Question:
Animal studies with oral doses up to 3,000 mg/kg of EPs 7630 provided no evidence of liver-damaging effects
Detailed reviews of the small number of human liver-injury reports concluded that most cases were more plausibly explained by other factors (concurrent medications, infections, or pre-existing liver disease) rather than by Pelargonium itself
Regulatory agencies still recommend monitoring, so the cautious approach is to be aware of the warning signs and discontinue if they appear
Overdose Guidance:
There is no established toxic dose from the standardized extract at normal use levels
Taking more than recommended is unlikely to improve results and increases the chance of gastrointestinal side effects
If a large amount is accidentally ingested, especially by a child, contact a poison control center or healthcare provider
Allergic Reactions:
Hypersensitivity reactions are recognized but rare
Anaphylaxis is very rare but possible
Seek immediate medical attention for signs of a severe allergic reaction
Special Considerations
Form Selection:
Standardized liquid extract (EPs 7630): The most researched form; the drops are the classic Umckaloabo preparation; note the ethanol base
Standardized tablets: Convenient, alcohol-free, and consistent dosing; good for those who dislike the taste of the drops
Syrup (especially for children): More palatable and available in child-appropriate concentrations
Generic pelargonium root products: May vary considerably in potency and are not guaranteed to match the studied extract; choose standardized products when possible
Quality Indicators:
Look specifically for the standardized EPs 7630 extract, or products that clearly state standardization
Reputable manufacturers with quality certifications (GMP)
Third-party testing for purity and potency
Clear labeling of the species (Pelargonium sidoides, sometimes with Pelargonium reniforme)
Awareness of the alcohol content in liquid preparations
Short-Course Philosophy:
Pelargonium is fundamentally different from daily supplements; it is an acute remedy taken during illness and then stopped
Keep a bottle on hand so you can start treatment within the critical first 48 hours of symptoms
It is not intended for indefinite daily use, and long-term continuous use beyond studied durations is not well characterized
When to See a Doctor Instead of Self-Treating:
High or persistent fever
Difficulty breathing or shortness of breath
Symptoms that worsen or fail to improve after several days
Coughing up blood or discolored/bloody mucus
Severe or worsening sinus pain, ear pain, or throat symptoms
Any signs of a serious bacterial infection
Pelargonium is meant for uncomplicated respiratory infections, not as a replacement for medical care when it is needed
Sustainability Note:
Wild Pelargonium sidoides has faced pressure from overharvesting in South Africa due to global demand. Choosing products from manufacturers that source sustainably or use cultivated material supports the long-term availability of this plant and the communities that harvest it.
Research Status & Evidence Quality
Strong Evidence For:
Reducing symptom severity and duration in acute bronchitis in adults and children (multiple RCTs and meta-analyses)
Reducing cough intensity and improving illness-related quality of life
Reducing sick days and speeding return to work in acute bronchitis
A favorable safety and tolerability profile in short-term use
Moderate Evidence For:
Relief of common cold symptoms and faster recovery
Treatment of acute rhinosinusitis in adults
Treatment of non-streptococcal sore throat (tonsillopharyngitis)
Reducing COPD exacerbations as an add-on therapy
Reduced need for fever/pain medication in children
Preliminary/Laboratory Evidence For:
Broad antiviral activity against respiratory viruses (largely laboratory and some clinical subgroup data)
Antiviral potential explored for coronaviruses including SARS-CoV-2 (mostly in vitro; not established as a clinical treatment)
Anti-Helicobacter pylori adhesion (laboratory)
Immune modulation in athletes after intense exercise
Various other antimicrobial effects in cell and animal studies
Research Considerations:
Much of the highest-quality research uses one specific proprietary extract (EPs 7630), so results may not generalize to all pelargonium products
A significant portion of the research has been industry-funded, which is common for branded herbal products and warrants thoughtful interpretation rather than automatic dismissal
The Cochrane Collaboration has reviewed the evidence and found it supportive for several respiratory indications while noting some uncertainty
The European Respiratory Society has acknowledged Pelargonium root extract as a natural remedy for acute bronchitis symptoms
More independent, non-industry-funded trials would strengthen the evidence base
Summary & Key Takeaways
Pelargonium (Pelargonium sidoides), best known through the standardized extract EPs 7630 and the traditional name Umckaloabo, is one of the most thoroughly researched herbal remedies for acute respiratory infections. It works through a distinctive combination of mechanisms: preventing bacteria from adhering to airway cells, mild direct antiviral effects, active stimulation of the immune system, and improved mucus clearance through faster ciliary movement.
Bottom Line: For uncomplicated acute bronchitis, the common cold, sinusitis, and sore throat, Pelargonium has solid evidence for reducing symptom severity, easing cough, and helping people recover and return to normal activities faster. It is best started within 48 hours of feeling sick, taken three times daily, and used as a short course of about 7 to 10 days rather than as a daily long-term supplement. It offers a genuine non-antibiotic option for viral respiratory infections.
Key Safety Points: Pelargonium is generally well tolerated, with stomach upset being the most common side effect. Avoid it during pregnancy and breastfeeding, and use caution if you have an autoimmune condition (because it stimulates the immune system), take blood thinners, or have liver disease. While early concerns about liver injury have largely not been confirmed by detailed pharmacovigilance reviews, regulatory agencies still advise monitoring, so discontinue and seek medical advice if you notice signs of liver trouble such as dark urine, jaundice, or unusual fatigue.
Special Note: The strong clinical evidence applies specifically to the standardized EPs 7630 extract, so choose standardized, reputable products rather than generic pelargonium root when you want results that match the research. Pelargonium is meant for uncomplicated respiratory infections and is not a substitute for medical care. See a doctor if you have high fever, difficulty breathing, coughing up blood, or symptoms that worsen or fail to improve after several days. Used thoughtfully and early, it can be a valuable tool for getting through respiratory illness more comfortably and with less reliance on antibiotics.