Syzygium nervosum is a species of tree native to tropical Asia and Australia, extending as far north as Guangdong and Guangxi in China and as far south as the Northern Territory of Australia. The leaves and buds of them are harvested, dried, and brewed as a famous herbal tea in Vietnam known as "nước vối" with stomachic properties. Syzygium nervosum water or Syzygium nervosum tea is a beverage made with buds, or leaves that have been brewed and dried, which can also be used while the leaves are still fresh. This is a very popular drink in rural areas, even urban areas in the Northern Delta of Vietnam and is used to drink every day like green tea because it is believed to bring many benefits. Nu Voi Herbal Tea Cleistocalyx Nervosum - Kosterm., and Eugenia operculata Roxb - Voi Tea - Flower Flos - Shui Weng Hua