Gynostemma pentaphyllum is a climbing vine from the cucumber family, native to southern China and tropical Asia, that has been used in traditional medicine for centuries. Known most commonly as jiaogulan (pronounced “jee-OW-goo-lan”) or “southern ginseng,” the plant has drawn scientific interest because it produces compounds remarkably similar to those found in Panax ginseng, one of the most studied medicinal herbs in the world. It’s typically consumed as a tea or taken as a concentrated extract.
The Plant and Its Origins
Jiaogulan belongs to the genus Gynostemma, which contains 16 species spread across tropical and East Asia, from the Himalayas to Japan and as far south as New Guinea. China is home to 11 of those species, mostly growing south of the Yangtze River. The plant was first recorded in a Chinese text called the Herbal for Relief of Famines, and it has a long history of use among the Tujia ethnic group, who gave it names like “seven-leaf ginseng” and “gospel herb.”
Despite the ginseng comparison, jiaogulan is not related to true ginseng at all. It sits in the Cucurbitaceae family alongside cucumbers, melons, and gourds. The “southern ginseng” nickname comes entirely from its chemistry, not its lineage.
Why It’s Called “Southern Ginseng”
Researchers have identified roughly 90 active compounds in jiaogulan called gypenosides. These are structurally very close to the ginsenosides found in Panax ginseng root. In fact, at least six of them are chemically identical to specific ginsenosides. This overlap is unusual because the two plants are completely unrelated. Gas chromatography studies can tell the two apart by subtle differences in their overall saponin profiles, but the functional similarity is what drives much of the research interest: jiaogulan may deliver ginseng-like benefits from a plant that’s easier and cheaper to cultivate.
Effects on Blood Sugar and Insulin
One of the strongest areas of clinical evidence involves blood sugar regulation. In a controlled crossover trial with type 2 diabetic patients, drinking jiaogulan tea (6 grams of dried leaf per day) lowered fasting blood glucose by an average of 1.9 mmol/L compared to just 0.2 mmol/L in the placebo group. That brought the average fasting glucose from about 8.2 down to 6.3 mmol/L. Importantly, this improvement happened without any increase in circulating insulin levels, meaning the tea was helping the body use its existing insulin more effectively rather than forcing the pancreas to produce more.
Follow-up testing confirmed that steady-state plasma glucose (a measure of how well the body clears sugar from the blood) dropped significantly after the jiaogulan treatment, and a separate analysis found that HOMA-IR, a standard marker of insulin resistance, also decreased. The effect reversed when participants switched to the placebo, reinforcing that the tea itself was responsible.
Metabolic and Body Composition Effects
Jiaogulan appears to activate an enzyme called AMPK, sometimes described as a master metabolic switch. AMPK plays a central role in how cells burn fat and manage energy. In cell studies, the plant’s saponins increased AMPK activation in muscle cells. In mice, supplementation reduced the size and total weight of fat cells, lowered body weight, and decreased total cholesterol and LDL (“bad”) cholesterol by enhancing overall energy utilization.
Human data on body composition is still limited. One double-blind, placebo-controlled trial in overweight adults found a 1.2% decrease in percentage body fat in the jiaogulan group, though this result only approached statistical significance. The metabolic mechanism is plausible, but larger trials are needed before the fat-loss claims carry real weight.
Cardiovascular Effects
The gypenosides in jiaogulan directly stimulate the release of nitric oxide from blood vessel walls. Nitric oxide is the molecule that tells blood vessels to relax and widen, which lowers blood pressure and improves circulation. In laboratory testing on porcine coronary artery rings, jiaogulan extract produced concentration-dependent relaxation that was blocked when nitric oxide production was inhibited, confirming that nitric oxide is the primary mechanism. Cultured endothelial cells (the cells lining blood vessels) showed a dose-dependent increase in nitric oxide output when exposed to the extract.
This finding helps explain why jiaogulan has traditionally been associated with cardiovascular health. The nitric oxide pathway is the same one targeted by many conventional blood pressure medications.
Antioxidant Protection
Rather than simply providing antioxidants directly (the way vitamin C does), jiaogulan appears to boost the body’s own antioxidant defenses. In brain cell studies, an ethanolic extract increased both the protein levels and activity of two key protective enzymes: manganese superoxide dismutase and glutathione peroxidase. These enzymes neutralize reactive oxygen species before they can damage cells. The result was measurably lower hydrogen peroxide concentrations inside the cells and better protection against oxygen deprivation injury in brain tissue slices.
How It’s Taken
Jiaogulan is consumed in two main forms. As a traditional leaf tea, the typical recommendation drawn from research is 3 to 9 grams of dried leaves per day, steeped in hot water. The tea has a mildly sweet, slightly bitter taste. Concentrated extracts are also widely available as capsules or powders, with clinical studies using doses ranging from 400 mg to 450 mg per day for standardized ethanol extracts, though some diabetes-focused trials used much higher doses of 6,000 mg per day of less concentrated preparations.
A review of commercially available supplements found that most products contain 20 to 500 mg per serving, taken up to four times daily, with a maximum daily intake of about 600 mg for concentrated extracts.
Safety Profile
Jiaogulan has a generally favorable safety record. No formal contraindications have been identified. The most commonly reported side effects are nausea and increased bowel movements, though a clinical trial using 6 grams per day as tea reported no adverse effects. A four-month study in patients with fatty liver disease also found no adverse events from daily consumption of a liquid leaf extract.
Drug interaction data is sparse. Older animal studies produced mixed results, showing both blood-thinning and clot-promoting effects on platelets, so people taking anticoagulant medications should be cautious. Safety data during pregnancy and lactation is essentially nonexistent, and some isolated ginsenosides (structurally similar to gypenosides) have shown embryotoxicity in lab settings, which warrants caution for pregnant women.