Educational information, not medical advice — ask your doctor or midwife.
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Nakseokdeung is the dried, woody vine stem of Trachelospermum asiaticum, a climbing plant better known in gardens as star jasmine. It is a single drug in Korean traditional medicine, meaning one plant part rather than a blend. Traditional practitioners gave it for stiff, aching joints, tight muscles and sore throats.
Latin name: Trachelospermum asiaticum. It is also known as star jasmine stem. In Korea it is almost always simmered into a decoction (a strong tea made by boiling) and combined with other herbs rather than taken on its own.
The honest verdict: the traditional record is long and consistent, but human trial evidence is essentially absent. Long traditional use tells you what people have done for centuries, not that the herb works. That point is made here once and not repeated in every section below.
Nobody has shown how it works in people, because the human studies have not been done.
In Korean and Chinese traditional thinking, it is said to "dispel wind-damp" and free up the channels — an old way of describing painful, stiff joints and limbs that move poorly. That is a framework, not a measured mechanism.
Lab and animal work points to plant compounds called lignans, mainly arctiin and trachelogenin. In test tubes and in rodents these appear to lower some markers of swelling. Results in a dish or a mouse often do not carry over to a person, so treat this as a lead, not an answer.
Most often you will meet it as dried, sliced vine stem sold loose by weight. This is simmered in water to make a decoction (a strong tea made by boiling). It is rarely used by itself.
Other forms include ground powders, instant granules and alcohol tinctures (drops made by soaking the herb in alcohol). Quality and strength vary a lot between suppliers. Buy from a licensed Korean medicine pharmacy or a registered practitioner.
Avoid fresh garden star jasmine as a home substitute. Ornamental plants may be a different species, and the raw sap is irritating.
Star jasmine stem appears in the classical East Asian materia medica under the name luoshiteng, with records going back around two thousand years. It entered Korean practice through those texts and stayed in use in hanbang (Korean traditional medicine).
It is a recognised staple across Korean, Chinese and Japanese kampo traditions, usually in joint and throat formulas rather than alone.
See a doctor soon if your joint pain gets worse, a joint becomes hot and swollen, or you cannot use the limb.
Get same-day care for a sore throat with a high fever, drooling, or trouble swallowing or breathing. Also get care for a boil that spreads redness across the skin.
Stop the herb and call a doctor if you notice a pounding, slow or uneven heartbeat, unusual bruising or bleeding, swelling of the face or lips, or vomiting that will not stop.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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