Jiaogulan

Jiaogulan is the common name for Gynostemma pentaphyllum, a dioecious, herbaceous climbing vine in the gourd family, Cucurbitaceae ^[1]. The plant is known by many folk names, including southern ginseng, five-leaf ginseng, poor man's ginseng, and sweet tea vine; the Chinese name jiaogulan is often rendered as twisting blue plant ^[1]. Unlike true ginseng it is a vine rather than a root crop, but it is grouped alongside ginseng in popular use because of similarities in its chemistry ^[1].

The species is native to a broad swath of South and East Asia, ranging from India and Bangladesh through Southeast Asia to China, Korea, and Japan, and it grows on mountain slopes across a wide range of elevations ^[1]. It has since been cultivated and naturalized more widely, and it is grown as a hardy perennial in temperate gardens ^[1].

Traditionally the leaves are dried and brewed as a herbal tea, and the plant has a long history of folk use as a general tonic, with a reputation as an adaptogen said to support resilience and vitality ^[1]. Today it is consumed as tea and also taken as alcohol extracts and dietary supplements ^[1]. In the European Union it is regulated as a novel food, reflecting its relatively recent introduction to Western markets ^[1].

The characteristic constituents of jiaogulan are its saponins, a large group of dammarane-type compounds called gypenosides ^[1]. Some of these are chemically identical or very similar to the ginsenosides of Panax ginseng, and the plant also contains polysaccharides, flavonoids, and phytosterols ^[1][2]. A few gypenosides are intensely sweet, one being reported as roughly two hundred times sweeter than table sugar, which contributes to the tea's agreeable taste ^[1].

Modern research has examined the plant mainly for metabolic and cardiovascular effects. A small randomized controlled trial in people with type 2 diabetes reported improvements in fasting glucose and insulin sensitivity with jiaogulan tea, and reviews have summarized lipid-lowering and other pharmacological activities, though the overall evidence remains preliminary and larger, rigorous trials are still needed ^[2][3][4]. In the studies conducted to date it has generally been well tolerated, but its use is not a substitute for established treatment, and quality and composition can vary between products ^[3].

Generally well tolerated; the most common complaints are mild nausea or loose stools, especially at higher doses. Because it can lower blood sugar and blood pressure, watch for additive effects if you're on diabetes or blood-pressure meds. Data in pregnancy is lacking, so it is best avoided there.