San Leng

What Is San Leng?

San Leng is the pinyin name for Sparganii Rhizoma, the dried tuber of Sparganium stoloniferum, a plant that grows at the edges of ponds and slow water. In English it is called bur reed tuber or common bur reed rhizome, and its Chinese name means "three edges," describing the angular stems and the shape of the sliced tuber. The tubers are harvested in winter, washed, peeled, dried, and sliced, and like its classical partner E Zhu they are often prepared with vinegar to enhance their stasis-dispersing action. The dried slices are hard and light-colored with faint fibrous markings, and they are stored dry in the pharmacy before use.

TCM Properties and Actions

San Leng is neutral in nature, bitter and acrid in flavor, and enters the Liver and Spleen meridians. It is classified among the most forceful blood-invigorating substances: it breaks blood stasis, moves stagnant qi, dissolves accumulations and hard masses, and stops pain. The record describes it as similar to the previous root, E Zhu, but stronger in breaking blood. Traditional indications include fixed abdominal masses and indurations, amenorrhea caused by congealed blood, and pain from stubborn food stagnation. As with all "breaking" herbs, the classical description concerns TCM patterns identified by a practitioner; it is not a statement about managing cancer or other modern diseases.

Traditional Use and Common Combinations

In classical formulas, San Leng and E Zhu are renowned partners for chronic fixed pain and palpable masses in which both qi stagnation and blood stasis are judged present, with San Leng considered the more forceful at the blood level and E Zhu somewhat stronger for qi and food accumulation. San Leng also appears in specialist formulas for stasis pain after injury and for menstrual block with severe fixed pain. Because these are attacking herbs, classical texts insist on a clear excess pattern and often combine them with qi-tonifying ingredients to protect digestion during longer courses.

Safety, Contraindications, and Interactions

The contraindications are explicit: San Leng is contraindicated in pregnancy and in bleeding conditions. Its blood-breaking action could provoke or worsen hemorrhage and makes it unsuitable for heavy menstruation, bleeding ulcers, coughing of blood, or the period around surgery. People taking anticoagulant or antiplatelet medicines, those with clotting disorders, and breastfeeding women should only encounter it through a qualified practitioner who knows their full medication profile. Weak, deficient, or elderly patients should not use it outside a professionally composed formula, and it should be stopped promptly if unusual bruising, bleeding, or severe stomach pain appears.

How TCM Practitioners Use It Today

San Leng is prescribed inside compound formulas at a recorded dose of 6-9 grams, typically in processed form and in courses limited to the duration of the diagnosed stagnation. A practitioner monitors the response and pairs it with supporting herbs when needed. Persistent abdominal masses, abnormal bleeding, or severe pain require modern medical investigation and should never be managed with this herb alone. This overview is for education only and is not a substitute for professional medical advice or care.

Frequently asked questions

Is San Leng safe during pregnancy? No. San Leng is explicitly contraindicated in pregnancy because of its powerful blood-breaking action, and it is also contraindicated in any active bleeding condition. It should be used only by qualified professionals and never self-prescribed.

Can San Leng replace prescription medication? No. It addresses traditional stagnation and stasis patterns within a formula and cannot replace anticoagulants, oncology treatment, surgery, or other prescribed care. New masses, unexplained bleeding, or severe pain need prompt medical evaluation.

What is the difference between San Leng and E Zhu? The two are classical partners and are often prescribed together, but their emphases differ. San Leng (Sparganii Rhizoma) is neutral, bitter, and acrid and is regarded as stronger at breaking blood stasis. E Zhu (Curcumae Rhizoma) is warm, acrid, and bitter and is regarded as somewhat stronger at moving qi and dissolving food accumulation. Both are contraindicated in pregnancy and demand specialist handling.