Sang Bai Pi

What Is Sang Bai Pi?

Sang Bai Pi is the dried root bark of the white mulberry tree, Morus alba, recorded as Mori Cortex. In English it is called white mulberry root bark or simply mulberry bark. The mulberry is a familiar tree across Asia and the Mediterranean world, valued historically for silk production and for several separately used medicinal parts: leaf, fruit-branch, and root bark.

The root is dug in winter, washed, and stripped of its rough outer brown cork while fresh, leaving the smooth, whitish inner bark that is cut into strips and dried. Good material is fibrous, powdery-white to pale yellow, and soft to tear. It may be used unprocessed or stir-fried with honey; honey-prepared Sang Bai Pi is regarded as gentler and more suitable for deficient-type cough.

TCM Properties and Actions

Sang Bai Pi is cold in nature and sweet in flavor, and it enters the Lung meridian. Its recorded action is to descend Lung qi and calm wheezing, promote water metabolism and reduce edema; used for shortness of breath with wheezing and edema.

Two functions are central. First, it drains Lung heat and directs Lung qi downward, which in TCM terms addresses hot-type cough and wheezing marked by rapid breathing, yellow or scant sputum, and a dry throat. Second, it promotes urination and moves fluids, addressing edema patterns with facial or limb swelling and reduced urine. These two roles are linked by the traditional understanding of the Lung as the organ that governs the upper source of water metabolism.

Traditional Use and Common Combinations

For Lung-heat cough and wheezing, Sang Bai Pi is classically combined with Di Gu Pi (Lycium root bark), supported by Gan Cao (licorice) and rice in a well-known pediatric-origin clearing formula. For water swelling with fullness and difficult urination, it is paired with other water-moving herbs such as Fu Ling (Poria) and Da Fu Pi (areca peel), as directed by the practitioner.

These pairings reflect TCM patterns of Lung heat and fluid accumulation rather than treatment of modern kidney, heart, or pulmonary disease. New swelling of the face or legs, especially with breathlessness or reduced urine, should be medically assessed rather than managed with herbs alone.

Safety, Contraindications, and Interactions

Sang Bai Pi is contraindicated in profuse urination. Because its function is to promote urination and drain fluids, increasing urinary loss in someone already passing large amounts of clear urine is considered inappropriate and potentially draining.

It is also a cold material, so cough and wheezing of a deficient-cold nature, with thin clear sputum and aversion to cold, are not treated with it alone. Caution is appropriate during pregnancy and breastfeeding, in young children, and in people with low blood pressure, dehydration, or reduced kidney function, as well as anyone taking diuretics or other prescription medicines; use should be supervised by a qualified practitioner. Stop use if dizziness, weakness, or excessive urination occurs.

How TCM Practitioners Use It Today

The recorded dosage is 6-12 grams in decoction. Unprocessed bark is chosen for heat and edema, while honey-prepared bark is used when a gentler, slightly moistening effect is needed. Practitioners avoid it in profuse urination and deficient-cold wheezing and coordinate its use with any conventional treatment.

This information is educational and does not replace clinical diagnosis or professional care. Sudden breathing difficulty or significant swelling warrants prompt medical evaluation.

Frequently asked questions

Is Sang Bai Pi safe during pregnancy?

Because it is cold and promotes urination, it should not be self-selected during pregnancy or breastfeeding or used casually in children. A qualified practitioner can decide whether it fits the pattern and can monitor use safely.

Can Sang Bai Pi replace prescription medication?

No. Its traditional roles in wheezing and edema are not substitutes for treatment of asthma, heart, or kidney disease in modern medicine, and it cannot replace diuretics or other prescribed medicines. Swelling with breathlessness needs prompt medical care.

What is the difference between Sang Bai Pi and Sang Ye (mulberry leaf)?

Both come from Morus alba but are different parts with different emphasis. Sang Bai Pi is the root bark, cold and sweet, used to drain Lung heat to calm wheezing and to move water in edema. Sang Ye is the leaf, cool and sweet-bitter, used to scatter wind-heat in exterior eye and head symptoms and to gently clear Lung heat in dry cough.