On a sweltering afternoon in Ho Chi Minh City, 21-year-old university student Phuong Linh takes a break from her part-time shift at a fashion store on Tran Huy Lieu Street. Taking a sip of her chilled Dr Thanh Herbal Tea, she says, “Late nights and irregular meals always leave me feeling overheated and uncomfortable. Since switching to natural herbal drinks, I feel lighter, more refreshed—like my body’s been cleansed.”