Hermetica Superfood Encyclopedia
The Short Answer
1,8-Cineole is a monoterpene compound found in eucalyptus oil that demonstrates anti-inflammatory and bronchodilatory effects through modulation of inflammatory cytokines. Clinical trials show efficacy for respiratory conditions including COPD exacerbation prevention and asthma control improvement.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keyword1,8-cineole benefits
Synergy Pairings3
1,8-Cineole — botanical close-up
Health Benefits
Origin & History
Natural habitat
1,8-Cineole (eucalyptol) is a naturally occurring monoterpene oxide with a camphoraceous odor, primarily extracted from Eucalyptus globulus leaves, as well as rosemary and tea tree plants. Production involves steam distillation of plant materials, yielding a colorless to pale yellow liquid that is purified to ≥99% for pharmaceutical applications.
“1,8-Cineole has been used for centuries in Australian Aboriginal medicine from Eucalyptus leaves for respiratory infections, coughs, and pain relief. Since the 19th century, it has been incorporated into European phytotherapy for bronchitis and sinusitis, with modern clinical validation supporting these traditional respiratory applications (PMID: 39937641, 24831245).”Traditional Medicine
Scientific Research
Clinical evidence includes a randomized controlled trial (n=62) demonstrating anxiety reduction with 1,8-cineole inhalation before medical procedures (PMID: 25028591), and multiple trials showing COPD and asthma management benefits at 600mg/day oral dosing (PMID: 24831245). Additional research correlates plasma levels with cognitive enhancement (PMID: PMC3736918), though no meta-analyses were identified in the current data.
Preparation & Dosage
Traditional preparation
Clinically studied dosages include: Inhalation - 1% solution or pure compound via mask for 5 minutes for anxiety; Oral - 200mg three times daily (600mg/day) for COPD/asthma management; standardized preparations typically contain ≥99% pure 1,8-cineole or eucalyptus oil with 70-85% content. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
1,8-Cineole (also known as eucalyptol) is a pure monoterpenoid compound (C10H18O, molecular weight 154.25 g/mol), not a food ingredient, therefore it has no conventional macronutrient or micronutrient profile. It is a bicyclic ether comprising 100% bioactive monoterpene by definition when in isolated form. Key physicochemical properties relevant to bioavailability: lipophilic (logP ~2.74), boiling point 176°C, density 0.921 g/mL. Bioactive compound data: when derived from eucalyptus oil, 1,8-Cineole typically constitutes 60–90% of the essential oil by volume. Oral pharmaceutical dosing studied at 200mg capsules (Soledum/Cineole formulations) 3x daily (600mg/day total). Inhalation bioavailability is rapid, with detectable blood levels within minutes of exposure; oral bioavailability is estimated at approximately 80–90% due to high lipophilicity and rapid GI absorption. It undergoes hepatic CYP450 metabolism (primarily CYP2B6, CYP3A4) to hydroxylated metabolites (2-hydroxy-1,8-cineole, 3-hydroxy-1,8-cineole). Half-life is approximately 2 hours. No fiber, protein, vitamins, or minerals are present as it is a single isolated phytochemical compound. Caloric contribution is negligible at therapeutic doses.
How It Works
Mechanism of Action
1,8-Cineole inhibits pro-inflammatory cytokines including TNF-α, IL-1β, and IL-6 while reducing nuclear factor-κB activation. It enhances mucociliary clearance by stimulating chloride secretion and exhibits bronchodilatory effects through smooth muscle relaxation. The compound also modulates GABA neurotransmission, contributing to its anxiolytic properties.
Clinical Evidence
Randomized controlled trials demonstrate 1,8-cineole's efficacy across multiple conditions. A 62-participant RCT showed significant STAI anxiety score reduction with 5-minute inhalation (PMID: 25028591). Clinical trials confirm reduced COPD exacerbations with 200mg three times daily oral dosing (PMID: 24831245). Additional trials indicate improved asthma control, though sample sizes remain moderate and longer-term safety data is limited.
Safety & Interactions
1,8-Cineole is generally well-tolerated at therapeutic doses, with occasional reports of gastrointestinal upset and skin irritation from topical use. No significant drug interactions have been documented in clinical studies. Safety during pregnancy and lactation has not been established through controlled trials. Individuals with epilepsy should exercise caution due to potential CNS effects at high doses.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
eucalyptol1,8-epoxy-p-menthanecajeputol1,8-oxido-p-menthaneeucalyptus oilcineollimonene oxide1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane
Frequently Asked Questions
What is the effective dosage of 1,8-cineole for COPD?
Clinical trials demonstrate effectiveness at 200mg taken three times daily orally for preventing COPD exacerbations. This 600mg daily dose showed significant reduction in exacerbation frequency in controlled studies.
How quickly does 1,8-cineole work for anxiety?
Inhalation of 1,8-cineole showed significant anxiety reduction within 5 minutes in clinical trials. The compound's GABA-modulating effects allow for rapid onset when administered through aromatherapy or direct inhalation methods.
Can 1,8-cineole be taken with asthma medications?
No documented drug interactions exist between 1,8-cineole and standard asthma medications in clinical studies. However, patients should consult healthcare providers before combining with existing respiratory treatments to ensure optimal therapeutic outcomes.
What are the side effects of 1,8-cineole supplements?
Common side effects include mild gastrointestinal upset and occasional nausea at therapeutic doses. Topical applications may cause skin irritation in sensitive individuals, while high doses could potentially trigger CNS effects in epileptic patients.
Is 1,8-cineole safe during pregnancy?
Safety during pregnancy has not been established through controlled clinical trials. While eucalyptus oil containing 1,8-cineole has traditional use, pregnant women should avoid supplemental doses and consult healthcare providers before any therapeutic use.
What is the difference between inhaling and taking 1,8-cineole orally?
Inhalation of 1,8-cineole provides rapid onset for acute anxiety reduction, with clinical studies showing significant effects within 5 minutes of exposure. Oral dosing (typically 200mg three times daily) is better suited for chronic conditions like COPD and asthma, where sustained anti-inflammatory and mucolytic effects are needed over weeks to prevent exacerbations. The route of administration should match the therapeutic goal: inhalation for acute symptoms and oral supplementation for long-term respiratory management.
Who is most likely to benefit from 1,8-cineole supplementation?
Individuals with COPD, chronic asthma, or recurrent respiratory infections are primary candidates for 1,8-cineole supplementation due to its proven anti-inflammatory and mucolytic properties. Patients experiencing preoperative anxiety may also benefit from inhalation methods, as clinical trials demonstrate measurable anxiety reduction. Those with mild cognitive concerns or age-related cognitive changes represent an emerging population of interest based on preliminary research, though more evidence is needed in this area.
What is the evidence quality for 1,8-cineole's effectiveness in respiratory conditions?
Clinical trials support 1,8-cineole's use in COPD and asthma, with research demonstrating reduced exacerbations and improved symptom control through documented anti-inflammatory mechanisms. Randomized controlled trials, including studies with moderate sample sizes (n=62 for anxiety), provide reasonable evidence for specific applications. However, the total body of research, while promising, remains limited compared to conventional respiratory medications, suggesting 1,8-cineole is most appropriate as a complementary approach rather than monotherapy.
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