Hinokitiol (β-thujaplicin) is a natural monoterpenoid found in the wood of trees in the family Cupressaceae. It is a tropolone derivative and one of the thujaplicins.[2] Hinokitiol is widely used in oral care and treatment products for its broad spectrum anti-viral, antimicrobial and anti-inflammatory action. Additionally, it is approved as a food additive for the preservation of food in Japan.