Jiaogulan (giảo cổ lam, gynostemma) explained: the caffeine-free “southern ginseng” tea, its gypenosides, the Vietnamese research behind it, and what human trials actually show.
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In the misty mountains of southern China there is a humble climbing vine that locals have brewed as a daily tea for generations — and in the villages where it grows, people were said to live remarkably long lives. That vine is jiaogulan (绞股蓝), known in Vietnam as giảo cổ lam and often marketed in the West as "southern ginseng" or even the "herb of immortality." It is one of the most interesting herbs in this whole guide, because — unlike most traditional tonics — it actually has a fair amount of human research behind it. This profile is part of our wider guide to Asian herbal traditions.
Jiaogulan (Gynostemma pentaphyllum) is a perennial climbing vine — and here is the first surprise: it is not a ginseng at all. It belongs to the Cucurbitaceae family, the same botanical family as cucumbers, melons, and gourds (Razmovski-Naumovski et al., 2005). It earned the nickname "southern ginseng" purely because of its chemistry, not its lineage.
Traditionally it was a mountain tea of southern China — particularly around Guizhou and Fanjing Mountain — where its association with local "longevity villages" gave rise to the romantic "herb of immortality" name (Razmovski-Naumovski et al., 2005). That folklore is charming, but it is folklore: there is no evidence that any herb extends human lifespan, and "immortality" is best read as heritage marketing rather than fact.
The link to ginseng is real, but it is chemical, not botanical. Jiaogulan is rich in gypenosides — more than a hundred dammarane-type saponins, several of which are structurally identical to ginsenosides (the signature compounds of true ginseng), including ginsenoside-type molecules such as Rb1 and Rd (Viện Dược liệu, giảo cổ lam). Alongside these it carries flavonoids and polysaccharides.
So the accurate way to think about jiaogulan is this: a gourd-family vine that happens to make some of the same "adaptogenic" saponins as ginseng, at a fraction of the cost, in a form you can drink as an everyday tea. Much of the modern research interest centres on how these compounds activate an energy-sensing enzyme called AMPK, a key regulator of metabolism (Nayyar et al., 2023).
Few Western articles mention it, but Vietnam is one of the great homes of jiaogulan research and use. Giảo cổ lam is sold widely as a wellness tea, and a genuine research lineage sits behind that popularity: the Central Institute of Medicinal Materials (Viện Dược liệu) and Hanoi Medical University — in one case collaborating with Sweden's Karolinska Institutet — have studied it for blood sugar, blood lipids, and blood pressure, and even isolated a characteristic compound (phanoside) from Vietnamese material (Viện Dược liệu). In Vietnamese folk framing it is described with the neat phrase "ba giảm, ba chống" — three reductions, three protections.
This is where jiaogulan stands out: it has more human data than most traditional tonic herbs, though the studies are still small and the certainty modest.
The honest summary: promising and unusually well-studied for a folk tea, but the trials are small, the evidence certainty is low, and the saponins have limited oral bioavailability (Li et al., 2019). Jiaogulan may support healthy metabolism as part of a good diet — it is not a substitute for prescribed treatment, and none of this makes it a proven medicine. Individual responses vary considerably.
Jiaogulan is almost always taken as a tea. The dried leaves are steeped in hot (not boiling) water for a few minutes to give a light, grassy, faintly sweet-then-bitter brew that can be re-infused several times. Human studies have typically used around 6 g of dried herb a day, which is a realistic everyday amount for a tea drinker (Huyen et al., 2010). It is also sold as teabags, powders, and capsules.
Because it is caffeine-free, many people drink it in the afternoon or evening in place of caffeinated tea. If you enjoy herbal infusions, it slots naturally into the same ritual as our other Asian herbal teas.
As a tea, jiaogulan is generally well tolerated, and the lipid review actually recorded fewer adverse events in the herb groups than in the drug groups (Dai et al., 2022). Still, some sensible cautions apply:
No. It is an unrelated gourd-family vine. The "southern ginseng" nickname comes from shared dammarane saponins (some identical to ginsenosides), not from any botanical relationship.
It is traditionally a longevity and energy tonic tea. Modern research shows early, small-scale signals for cholesterol, blood sugar, and exercise metabolism — but the evidence is limited and it is not a proven treatment for any disease.
No. It is naturally caffeine-free, which is why many people drink it in the evening.
Human studies commonly used around 6 g of dried herb per day. Start modestly, and consult a professional if you take medication or have a health condition.
Pregnant or breastfeeding women, and anyone on diabetes, blood-pressure, anticoagulant, or immunosuppressant medication should check with a clinician first because of possible additive effects.
That is folklore from Guizhou longevity villages, not a medical claim. No herb extends lifespan; treat "immortality" and "miracle" marketing as unproven.
Jiaogulan is a rare thing among traditional tonics: a folk tea with a genuine, if still preliminary, evidence base. It is not a ginseng, and it is certainly not an elixir of immortality — but it is a pleasant, caffeine-free vine tea whose gypenosides show real promise for metabolic health in early human studies. Enjoyed as part of a balanced lifestyle, and with sensible caution around medications, it is a worthy addition to the Asian herbal-tea shelf. For the bigger picture, explore our traditional wellness practices guide.
Written by: Health Diary Editorial Team — writers and researchers focused on making traditional Asian wellness knowledge clear, accurate, and culturally grounded.
Editorial review: This article has been reviewed by the Health Diary editorial team for clarity, structure, and adherence to our sourcing standards. Because jiaogulan has more human data than most tonic herbs, we cross-checked claims against a systematic review and individual RCTs, kept the evidence honestly hedged (small samples, low certainty), and clarified that it is botanically unrelated to ginseng. It is not a clinical review and should not replace consultation with a licensed healthcare practitioner.
Reviewed on: August 5, 2026.
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