What is Sang Ye used for in TCM?

Sang Ye (桑叶, Mulberry leaf) is primarily used to disperse wind-heat, clear Lung heat, and cool Liver heat. Clinically, it treats early-stage wind-heat colds with cough and sore throat, dry cough with little phlegm, red and dry eyes from Liver heat, and dizziness with headache. In modern TCM, it is also valued for its blood sugar–regulating properties. Sang Ye is the chief herb in the classic formula Sang Ju Yin (Mulberry and Chrysanthemum Drink), one of the most prescribed formulas for early wind-heat colds with cough.

Can mulberry leaf tea help with diabetes?

Modern research has shown that mulberry leaf contains 1-deoxynojirimycin (DNJ), a compound that inhibits alpha-glucosidase — the enzyme that breaks down carbohydrates into glucose. This gives mulberry leaf a blood sugar–lowering effect comparable to some diabetes medications. In TCM, Sang Ye has been traditionally used to treat 'Xiao Ke' (消渴, wasting-thirst syndrome), which includes symptoms of diabetes. While promising, mulberry leaf should be used as a complementary approach alongside, not in place of, standard diabetes treatment under medical supervision.

Sang Ye (桑叶): Mulberry Leaf in TCM — The Cooling Herb for Lungs, Eyes, and Blood Sugar

What Is Sang Ye?

Sang Ye (桑叶) is the dried leaf of the mulberry tree (Morus alba), the same tree whose leaves feed silkworms. In TCM, the mulberry tree is a treasure trove — its leaves (Sang Ye), root bark (Sang Bai Pi), twigs (Sang Zhi), and fruit (Sang Shen) are all used medicinally, each with distinct properties.

Sang Ye is classified as a wind-heat dispersing herb, valued for its light, aromatic quality that allows it to treat surface-level heat patterns — particularly in the Lungs and the eyes. It is the chief herb in Sang Ju Yin, one of the most commonly prescribed formulas for early-stage wind-heat colds.

Basic Information

Property	Details
Chinese name	桑叶 (Sāng Yè)
English name	Mulberry Leaf
Pharmaceutical name	Mori Folium
Source	Leaves of Morus alba
Nature	Cool
Flavor	Sweet, bitter
Meridian affinity	Lung, Liver
Dosage	5–10g (decoction)

TCM Properties and Actions

Primary Actions

Disperses wind-heat (疏散风热) — for exterior wind-heat patterns
Clears Lung heat (清肺热) — for cough and dry throat
Cools Liver heat and brightens eyes (清肝明目) — for red, dry eyes
Stops bleeding (凉血止血) — for mild blood heat bleeding

Unique Qualities

Sang Ye is light and floating in nature — it rises to the upper body (Lungs, head, eyes) to clear heat at the surface level. Unlike heavier heat-clearing herbs that work deep in the organs, Sang Ye works at the boundary between exterior and interior, making it ideal for early-stage conditions where heat has just entered the body.

Clinical Applications

1. Wind-Heat Cold with Cough (风热咳嗽)

This is Sang Ye’s primary clinical use:

Early-stage cold with mild fever
Cough with yellow or scanty phlegm
Dry throat and sore throat
Headache
Slight sweating

Classic formula: Sang Ju Yin (桑菊饮) — Sang Ye + Ju Hua + Jie Geng + other herbs. This is the standard formula for wind-heat colds where cough is the predominant symptom.

2. Dry Cough (燥咳)

Dry, hacking cough with little or no phlegm
Dry throat and mouth
Worse in autumn (the season of dryness)
Often combined with Xing Ren (Apricot Kernel), Mai Men Dong, Sha Shen

3. Red, Dry, Painful Eyes (目赤肿痛)

Through its Liver affinity, Sang Ye treats:

Red, bloodshot eyes
Dry, gritty sensation in the eyes
Eye pain from Liver heat
Blurred vision with heat signs
Often combined with Ju Hua, Jue Ming Zi, Xia Ku Cao

4. Dizziness and Headache (头晕头痛)

Headache from Liver yang rising
Dizziness with red eyes
Hypertension-related headache with heat signs

5. Xiao Ke (Wasting-Thirst / Diabetes)

In TCM, Sang Ye has been traditionally used for Xiao Ke syndrome (消渴), characterized by excessive thirst, hunger, and urination — symptoms that overlap with diabetes. This traditional use has been validated by modern research.

Classic Formulas

Sang Ju Yin (桑菊饮 — Mulberry and Chrysanthemum Drink)

Herb	Role
Sang Ye	Chief — disperses wind-heat, clears Lung
Ju Hua	Chief — disperses wind-heat, clears Liver
Bo He	Deputy — disperses wind-heat
Jie Geng	Deputy — opens Lungs, stops cough
Xing Ren	Assistant — descends Lung Qi, stops cough
Lian Qiao	Assistant — clears heat
Lu Gen	Assistant — generates fluids
Gan Cao	Harmonizes

Use: Early wind-heat cold where cough is the main symptom. Milder than Yin Qiao San — specifically designed for cough-dominant wind-heat.

Sang Xing Tang (桑杏汤 — Mulberry and Apricot Decoction)

Sang Ye + Xing Ren + Sha Shen + other herbs
For autumn dryness cough with dry throat and scanty phlegm
Nourishes Lung Yin while clearing dry heat

Sang Ye vs. Other Wind-Heat Herbs

Feature	Sang Ye	Ju Hua	Bo He
Strength	Balanced heat-clearing + Lung moistening	Stronger Liver/eye focus	Stronger exterior-releasing
Best for	Cough with wind-heat	Eye problems with wind-heat	Sore throat, headache
Moistening	Yes — generates fluids	Slightly	No — can be drying
Blood sugar	Unique property	No	No

Modern Research

Contemporary studies on Sang Ye have revealed significant findings:

Blood sugar regulation — DNJ (1-deoxynojirimycin) inhibits carbohydrate absorption
Antioxidant — rich in flavonoids and polyphenols
Anti-inflammatory — reduces inflammatory markers
Antibacterial — activity against several pathogens
Lipid-lowering — helps reduce cholesterol levels
Weight management — some evidence for reducing fat absorption
Neuroprotective — potential protective effects on brain cells

Forms and Usage

Mulberry Leaf Tea

The simplest preparation:

Take 5–10g dried Sang Ye (or fresh leaves)
Steep in boiling water for 10 minutes
Drink warm, 1–2 cups daily
Often combined with Ju Hua or Gou Qi Zi for eye health

In Decoction

Standard dose: 5–10g
Add late in cooking to preserve volatile oils
For lung conditions, decoction is preferred over tea

Mulberry Leaf Powder

Modern supplement form for blood sugar management
Often standardized for DNJ content
Taken before meals

The Complete Mulberry Tree

The mulberry tree provides multiple TCM medicines:

Part	Name	Primary Use
Leaf	Sang Ye (桑叶)	Wind-heat, Lung heat, eyes
Root bark	Sang Bai Pi (桑白皮)	Lung heat cough, edema
Twig	Sang Zhi (桑枝)	Joint pain, upper body wind-damp
Fruit	Sang Shen (桑椹)	Nourishes Blood and Yin

Precautions

Situation	Guidance
Wind-cold pattern (chills, no sweating)	Not suitable — cool nature may worsen
Spleen cold deficiency	Use cautiously, larger doses may cause loose stools
Pregnancy	Generally safe at normal doses, consult practitioner

Key Takeaways

Sang Ye (Mulberry Leaf) is the chief herb in Sang Ju Yin, the classic formula for wind-heat cough
Clears Lung heat, disperses wind-heat, and cools Liver heat for eye problems
Modern research validates its blood sugar–lowering properties (DNJ compound)
Light and floating nature makes it ideal for early-stage surface heat
Forms a natural pair with Ju Hua for wind-heat and eye conditions
The mulberry tree is a complete TCM pharmacy — leaves, bark, twigs, and fruit are all medicinal

Disclaimer: This article is for educational purposes only. Consult a licensed TCM practitioner before using Sang Ye or any herbal preparation.