Corn Silk

Corn Silk (Yu Mi Xu): A Gentle Herb for Urinary Health, Edema, and Liver Support

Introduction

Corn silk, known as Yu Mi Xu (玉米须) in Traditional Chinese Medicine (TCM), is a soft, thread-like herb used to promote urination, reduce swelling, and support Liver and Gallbladder health. With its sweet, bland, and slightly cooling nature, corn silk is a popular remedy for urinary tract issues, water retention, and jaundice. Whether consumed as a tea or included in herbal formulas, Yu Mi Xu provides a light and soothing approach to clearing internal dampness and heat.

What Is Corn Silk?

Yu Mi Xu refers to the silky threads harvested from the ears of Zea mays (corn). In TCM, it is classified as sweet and bland in taste and slightly cool in nature, entering the Bladder, Liver, and Gallbladder meridians. It is traditionally used to promote urination, relieve edema, ease painful urination, and support the smooth flow of bile. Corn silk is also known to assist in managing blood pressure and balancing blood sugar when used long term.

Health Benefits of Corn Silk

Promotes Urination and Relieves Edema
Corn silk is commonly used to reduce water retention and swelling, especially in the lower limbs, by gently promoting urination.

Soothes the Urinary Tract and Eases Discomfort
It is helpful for painful, frequent, or urgent urination associated with urinary tract infections or inflammation.

Supports Liver and Gallbladder Function
Yu Mi Xu is traditionally used to aid the flow of bile, making it supportive for jaundice, gallstones, and sluggish liver function.

Helps Regulate Blood Sugar and Pressure
Corn silk may assist in lowering blood glucose and mild hypertension through its diuretic and metabolic balancing actions.

Cools Internal Heat and Clears Dampness
Its slightly cooling nature helps resolve damp-heat conditions such as cloudy urine, scanty urination, or heat in the Liver.

How to Use Corn Silk

In Herbal Teas or Decoctions
Use 10–15 grams of dried corn silk steeped in hot water or simmered for 20–30 minutes. Drink 1–2 cups daily for urinary or fluid regulation.

In Blends with Other Diuretic Herbs
Combine with herbs like plantain seed (Che Qian Zi), dandelion, or mulberry leaf to support urination and detoxification.

As a Mild Daily Tonic
Yu Mi Xu can be sipped as a mild daily beverage during hot seasons or for those prone to damp-heat and fluid retention.

Where to Buy Corn Silk

You can find Yu Mi Xu at the following places:

• Chinese herbal medicine shops

• Natural food stores and tea sections

• Online retailers such as Amazon, iHerb, or TCM specialty sites

Look for:

• Light golden or tan dried silk threads

• Organic or pesticide-free sources

• Properly dried and packaged in moisture-safe containers

Are There Any Side Effects?

Corn silk is considered very safe and gentle for most people. In large doses, it may cause increased urination or electrolyte imbalance. Those with severe kidney conditions, low blood pressure, or using diuretics should consult a healthcare provider before use. Best used with moderation during pregnancy.

Conclusion

Corn silk, or Yu Mi Xu, is a soothing and effective herb in TCM that supports urinary tract health, reduces fluid buildup, and aids liver and bile flow. Whether brewed into a light tea or added to herbal blends, it offers a gentle yet powerful way to clear damp-heat and promote internal balance.

FAQs

Can I drink corn silk tea every day?
Yes, especially in warm weather or when experiencing fluid retention or urinary discomfort.

What does corn silk taste like?
It has a mild, slightly sweet, earthy flavor that is easy to drink and pairs well with other herbs.

Is corn silk safe for children?
Yes, in small amounts and under supervision, especially for mild urinary issues or swelling.