Contents: 100% Jiao Gu Lan Leaf Gynostemma Pentaphyllum ( Thunb.) Mak. Organically produced. Traditional Thai herbal tea. This tea is caffeine-free and has a slightly bittersweet taste. Jiao gu lan is known as sweet tea vine, fairy herb, and southern ginseng. Jiao gu lan is a climbing vine native to the mountainous regions. The vine leaves were first used as a food and could be eaten by themselves or used in salad. They are also used as a sweetener.