α-Terpineol-d₃ is the deuterium labeled α-Terpineol[1]. α-Terpineol is isolated from Eucalyptus globulus Labill, exhibits strong antimicrobial activity against periodontopathic and cariogenic bacteria[2].α-Terpineol possesses antifungal activity against T. mentagrophytes, and the activity might lead to irreversible cellular disruption[2].