Eucalyptol

Eucalyptol (1,8-cineole) is a bicyclic monoterpenoid ether (C₁₀H₁₈O) with a fresh, camphor-like odor and spicy, cooling taste. It is the dominant compound in eucalyptus oil and also found in rosemary, bay leaves, tea tree, and sage. It has been used in traditional medicine for centuries, particularly for respiratory conditions.

Modern research supports eucalyptol’s anti-inflammatory and decongestant properties. It is used in commercial mouthwashes (like Listerine) and respiratory formulations. It also demonstrates insecticidal properties. In cannabis, eucalyptol is relatively uncommon but when present, it adds a distinctive minty, clearing quality that users often describe as “breathing easier” after inhalation.