#Dipterocarpaceae

In Thailand’s evergreen forests, the golden resin exuded from great dipterocarp trees after storms has long been part of local healing lore. Known as Chanyoiy, this resin comes from trees such as Yang Na, Takhian Thong, Teng, and Rang. For generations, dried exudates were valued by traditional healers and rural communities, weaving ethnobotanical knowledge with contemporary interest in plant-based therapies. This piece examines why Chanyoiy endures and what modern science reveals.

In Thailand’s evergreen forests, the sight of a great dipterocarp tree bleeding golden resin after a monsoon storm would be familiar to generations past. To many, this thick aromatic substance—locally known as “ชันย้อย” (Chanyoiy)—seems little more than nature’s bandage. Yet, for centuries, the dried exudates from Dipterocarpaceae family trees such as the Yang Na, Takhian Thong, Teng, and Rang have been treasured by Thai traditional healers and rural communities, forming a bridge between ancient ethnobotanical wisdom and today’s rebirth of plant-based therapeutics. What lies behind the enduring appeal of Chanyoiy, and does modern science validate its traditional role?