Poy-Sian is a Thai brand of aromatherapy nasal inhalers and balms known for their refreshing blend of menthol, camphor, eucalyptus, and borneol oils, which provides quick relief from nasal congestion, dizziness, headaches, and fatigue. The brand offers inhalers with a double-sided design, allowing users to inhale the mentholated oil through one end or twist off the bottom to rub the aromatic liquid onto their skin for additional relief.