Herbs (Global Traditional) · African
Scented Geranium (Pelargonium graveolens) (Pelargonium graveolens)
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Scented geranium (Pelargonium graveolens) contains phenolic compounds and essential oils that demonstrate antioxidant activity equivalent to 9.16 mM Trolox in laboratory studies. The plant's bioactive compounds work through free radical scavenging mechanisms and show antimicrobial properties against various bacterial strains.
Scented Geranium (Pelargonium graveolens) is a perennial shrub native to South Africa, Madagascar, and Réunion Island, belonging to the Geraniaceae family. The essential oil is obtained from the aerial parts (leaves and flowers) via steam distillation, yielding volatile compounds predominantly composed of monoterpenes, sesquiterpenes, alcohols, esters, and oxides.
No human clinical trials, RCTs, or meta-analyses on Pelargonium graveolens were identified in the available research. The cited study (PMID 23027699) describes chemical composition and laboratory-based bioactivities without human data, focusing solely on in vitro antioxidant and antimicrobial testing.
No clinically studied dosage ranges for Pelargonium graveolens extracts, powders, or standardized forms have been established due to absence of human trials. In vitro studies used essential oil concentrations for antimicrobial testing, but these cannot be translated to human dosing recommendations. Consult a healthcare provider before starting any new supplement.
Scented Geranium (Pelargonium graveolens) is not typically consumed as a food for macronutrient value but is valued for its essential oil and bioactive phytochemical content. **Essential Oil Composition (leaf/aerial parts):** The essential oil (yield ~0.1–0.3% of fresh weight) is rich in monoterpenoids and sesquiterpenoids, with major constituents including citronellol (25–45%), geraniol (5–18%), linalool (3–12%), citronellyl formate (5–12%), isomenthone (4–10%), and menthone (1–5%). Minor terpenoids include β-caryophyllene, germacrene D, and geranyl formate. **Phenolic & Flavonoid Content:** Leaves contain total phenolics estimated at approximately 45–90 mg gallic acid equivalents (GAE) per gram of dry extract, and total flavonoids at approximately 15–40 mg quercetin equivalents per gram of dry extract. Key polyphenolic compounds identified include quercetin, kaempferol, rutin, gallic acid, ellagic acid, and catechins. **Tannins:** Hydrolyzable tannins (including ellagitannins and gallotannins) are present at notable concentrations, contributing to the plant's astringent properties and antioxidant capacity. **Minerals (approximate, per dry leaf material):** Potassium (~12–18 mg/g), calcium (~8–15 mg/g), magnesium (~3–6 mg/g), iron (~0.2–0.8 mg/g), zinc (~0.03–0.08 mg/g), and manganese (~0.05–0.15 mg/g). Concentrations vary significantly with soil conditions and cultivar. **Vitamins:** Small amounts of ascorbic acid (vitamin C, ~10–30 mg/100 g fresh leaf) have been reported. No significant amounts of B-vitamins or fat-soluble vitamins are documented. **Macronutrients:** As an herb, leaves contain modest crude protein (~8–14% dry weight), crude fiber (~10–20% dry weight), and negligible fat content (~1–3% dry weight, excluding essential oil fraction). Carbohydrates make up the remainder (~40–55% dry weight), largely as structural polysaccharides. **Bioavailability Notes:** The essential oil constituents (citronellol, geraniol, linalool) are readily absorbed transdermally and via inhalation, making aromatherapeutic use an efficient delivery route. Oral bioavailability of polyphenols such as quercetin and kaempferol is generally low (estimated 2–20%) due to extensive first-pass hepatic metabolism and poor aqueous solubility; co-administration with lipids or formulation as glycosides (e.g., rutin) may modestly improve absorption. Tannin-rich extracts may further reduce bioavailability of certain minerals (iron, zinc) through chelation. Most nutritional and phytochemical data derive from in vitro analyses; human pharmacokinetic studies specific to P. graveolens preparations are lacking.
Scented geranium's phenolic compounds and essential oils, including citronellol and geraniol, exert antioxidant effects by neutralizing free radicals through electron donation mechanisms. The antimicrobial activity appears to work by disrupting bacterial cell membrane integrity and inhibiting fungal cell wall synthesis. These bioactive compounds may also modulate inflammatory pathways, though specific receptor interactions require further research.
Current evidence for scented geranium is limited to in vitro laboratory studies with no human clinical trials available. Antioxidant testing showed free radical scavenging capacity up to 9.16 mM Trolox equivalents in controlled laboratory conditions. Antimicrobial studies demonstrated activity against various bacterial strains and fungal species in petri dish experiments. The lack of human trials means dosage recommendations, bioavailability, and clinical efficacy remain unestablished.
Scented geranium is generally recognized as safe when used in typical culinary amounts, but safety data for supplement dosages is limited. Essential oil components may cause skin sensitization or allergic reactions in susceptible individuals. Potential interactions with anticoagulant medications are theoretically possible due to phenolic compounds, though no documented cases exist. Pregnant and breastfeeding women should avoid supplemental amounts due to insufficient safety data.
