Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Geraniol is a monoterpenoid terpene found in rose oil and citronella that modulates gut microbiota composition and reduces inflammatory responses. It acts primarily through antimicrobial mechanisms and microbiome modulation to improve digestive health.
Origin & History
Geraniol is an acyclic monoterpenoid alcohol naturally occurring in essential oils from roses, lemons, and citronella. It is extracted through steam distillation or solvent methods from these plant sources.
Research Narrative (Provisional)
A double-blind, placebo-controlled RCT (PMID: 36235860) with 56 IBS patients showed low-absorbable geraniol significantly reduced IBS symptoms over 4 weeks. Preclinical studies demonstrate anti-allergic and anti-inflammatory effects, but no other human clinical trials were identified.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
Geraniol (C₁₀H₁₈O, MW 154.25 g/mol) is an acyclic monoterpenoid alcohol, not a nutritional macronutrient source. It provides no calories, protein, fiber, vitamins, or minerals in physiologically relevant amounts. It is a bioactive compound found naturally in essential oils of rose (up to 40-75% of rose oil), palmarosa (70-85%), citronella (20-40%), geranium (15-25%), and lemongrass (2-5%). It occurs in smaller concentrations in various fruits and herbs: grapes, blueberries, carrots, coriander, nutmeg, ginger, and lemon. Typical dietary intake from food sources is estimated at low microgram-to-milligram levels per day. In clinical trials for IBS, therapeutic doses of 120 mg twice daily (enteric-coated capsules) have been used. Geraniol is lipophilic (logP ~3.56) and readily absorbed through the gastrointestinal tract. It undergoes Phase I and Phase II hepatic metabolism, primarily via CYP-mediated oxidation and glucuronidation. Oral bioavailability is moderate but variable depending on formulation; enteric coating significantly improves colonic delivery for gut-targeted effects. It is classified as GRAS (Generally Recognized As Safe) by the FDA for use as a flavoring agent. Key bioactive properties stem from its aldehyde metabolites (geranial/citral) and its direct interactions with microbial cell membranes and host inflammatory pathways. It also contains no significant cofactors, though it may synergize with other terpenoids (e.g., linalool, β-caryophyllene) when consumed as part of whole essential oil matrices. Storage and stability: susceptible to autoxidation upon air exposure, forming allergenic hydroperoxides; should be stored in airtight, light-protected containers.
Reported Mechanism (Provisional)
Geraniol exerts antimicrobial effects by disrupting bacterial cell membrane integrity and inhibiting quorum sensing pathways. It selectively reduces harmful gut bacteria like Oscillospira while promoting beneficial Faecalibacterium growth. The compound also modulates inflammatory cytokine production through NF-κB pathway inhibition.
Clinical Narrative (Provisional)
A clinical trial demonstrated that 52% of geraniol-treated IBS patients achieved a ≥50-point reduction in IBS Symptom Severity Scale scores compared to 16.7% with placebo. Microbiome studies show moderate evidence for reducing pathogenic bacteria and trends toward increasing beneficial species. The current evidence base is limited but promising, with most studies being small-scale preliminary investigations.
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