What Is Eucalyptol (1,8-Cineole)? Applications, Dosage, Alternatives & Specifications

Eucalyptol, also known as 1,8-Cineole, Cineole, Cajeputol, or 1,8-Epoxy-p-menthane, is a naturally occurring monoterpenoid cyclic ether compound. It is the main active and aromatic component of eucalyptus oil, with extensive application value in the global pharmaceutical industry, food flavorings, daily chemical products, and pesticide formulations. Its molecular formula is C10H18O, molecular weight is 154.249, CAS number is 470–82–6, EINECS number is 207–431–5, FEMA number is 2465, and JECFA number is 1234. Eucalyptol appears as a colorless to pale yellow clear oily liquid with a strong camphoraceous odor and a cooling, herbal taste. It is the key aromatic component of eucalyptus oil and is also a major active constituent of many medicinal aromatic plants. Eucalyptol is widely distributed in over 200 natural essential oils, including eucalyptus, rosemary, thyme, sage, cardamom, lavender, and ginger. Eucalyptol possesses both penetrating camphor notes and pleasant cooling aromas, with long-lasting stability. It is frequently used as an active ingredient and fragrance fixative in pharmaceutical preparations, oral care products, and air fresheners. In terms of chemical structure, eucalyptol is a bicyclic monoterpenoid containing an epoxy bridge between positions 1 and 8 of the cyclohexane ring. The compound is stable and does not decompose under normal distillation conditions. Eucalyptol is also an excellent industrial solvent and penetration enhancer. It should be noted that eucalyptol is a Class 3.3 flammable liquid with a high flash point; excessive ingestion may lead to toxicity, and usage must comply with safety dosage standards.

Eucalyptol is recognized as a natural multifunctional monoterpenoid compound, holding an important position in the fragrance and flavor, pharmaceutical and health, daily chemical, and agricultural industries. Its most outstanding core advantages lie in its broadspectrum biological activity, excellent pharmacological efficacy, and good safety profile with regulatory acceptance. BroadSpectrum Biological Activity: Eucalyptol possesses excellent multifaceted biological activities. It has antiinflammatory effects, inhibiting inflammatory cell infiltration and proinflammatory cytokine production. It has antioxidant effects, alleviating oxidative stress through signal pathway modulation and free radical scavenging. It has antibacterial effects, inhibiting bacterial cell membranes and showing good antimicrobial activity against E. coli and Staphylococcus aureus, with significant synergistic antibacterial effects when combined with antibiotics such as amoxicillin and gentamicin. Eucalyptol also exhibits skin penetrationenhancing effects, with studies showing it to be the most effective among nine common oxygenated monoterpenes for transdermal absorption, with cyclic oxygenated monoterpenes having better penetration enhancement than their acyclic counterparts.

Excellent Pharmacological Efficacy: Eucalyptol can lower blood pressure by relaxing blood vessels. It can improve respiratory inflammation, reduce mucus secretion, and alleviate bronchospasm, with clinical trials confirming its use in the control and prevention of chronic obstructive pulmonary disease (COPD) and asthma. These clinically validated benefits make eucalyptol a star ingredient in respiratory health products.