When people think of diếp cá (Houttuynia cordata), they usually imagine the leaves and stems, which are commonly used as fresh herbs or cooling juice. However, few know that the root of this plant, hidden deep underground, contains outstanding medicinal properties. In fact, in some cases, traditional Eastern medicine values the root even more highly than the leaves and stems.

Superior Detoxification and Heat-Clearing

According to traditional medicine, the root of diếp cá is cool in nature, pungent, and slightly bitter, entering the lung, liver, and spleen meridians. Particularly, the root is believed to have stronger detoxifying and heat-clearing effects compared to the stems and leaves. This helps the body eliminate accumulated toxins, cool internal heat, and is highly beneficial for conditions such as internal heat, boils, or heat-related illnesses.

Potent Diuretic and Anti-Edema Effects

The root of diếp cá possesses powerful diuretic properties, meaning it helps the body eliminate excess water and reduce swelling (anti-edema) caused by fluid retention. This is especially helpful for individuals suffering from edema, urinary retention, or urinary tract problems. Compounds such as quercitrin and isoquercitrin in diếp cá are believed to play a key role in this effect.

The root of diếp cá offers numerous health benefits. (Photo: China South of The Clouds)

Supports Respiratory and Urinary Tract Infections

Thanks to its natural antibacterial and anti-inflammatory properties, the root of diếp cá has long been used in folk remedies to support infection treatment. It is particularly known for helping with respiratory infections (such as bronchitis and pneumonia) and urinary tract infections. Its detoxifying, cooling, and diuretic qualities further enhance its effectiveness against pathogens.

Promotes Blood Circulation and Reduces Painful Swelling

In traditional medicine, the root of diếp cá also helps promote blood circulation, disperse blood stasis, and reduce swelling. This means it improves blood flow, breaks down blood clots, and alleviates pain and swelling caused by bruises, injuries, or localized inflammation. This lesser-known property makes the root especially valuable.

Improves Hemorrhoids and Constipation

While the leaves of diếp cá are already famous for treating hemorrhoids and constipation, the root also contributes significantly. With its cooling, laxative, and diuretic properties, it helps soften stools, relieve pressure on anal veins, and thereby improve hemorrhoid symptoms and reduce constipation.

Helps Control Blood Sugar

Some preliminary studies suggest that the root of diếp cá may help regulate blood sugar. Active compounds in the root may improve insulin sensitivity and reduce glucose absorption, though further research is needed to clarify its mechanisms and clinical effectiveness. This shows promising potential for those with diabetes or at risk of developing it.

Strengthens the Immune System

The root of diếp cá contains antioxidants that protect cells from free radical damage, thereby strengthening the immune system. A stronger immune system helps the body defend against external pathogens, lowering the risk of common illnesses such as colds and flu.

How to Use the Root of Diếp Cá

• Boiling for tea: Wash the roots (fresh or dried), then boil them to make a daily herbal drink.

• Juicing: Wash the roots, blend them with a little water, strain, and extract the juice. You can add honey or rock sugar to improve taste, and a slice of lemon to reduce its characteristic fishy odor.

• Combining with other herbs: The root of diếp cá can be combined with other medicinal herbs under the guidance of a traditional medicine practitioner to enhance treatment effectiveness for specific health conditions.