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Can Rehmannia glutinosa (Shu Di Huang) and Chinese yam (Shan Yao) be steeped in water for drinking?

Apr 16, 2025 Source: Cainiu Health
Dr. Zhang Xiuhong
Introduction
When Rehmannia glutinosa (Shu Di Huang) and Chinese yam (Shan Yao) are used to nourish the liver and kidneys, improve blood and qi deficiency, or regulate a weak constitution, drinking them as a tea may be beneficial. Rehmannia glutinosa has the effect of nourishing yin and enriching blood, while Chinese yam strengthens the spleen and benefits the kidneys. When used together, they can help alleviate symptoms such as fatigue and weakness in the lower back and knees caused by liver and kidney deficiency. This combination is suitable for individuals with a cold constitution or those requiring mild nourishment and support.

Rehmannia glutinosa and Chinese yam can usually be consumed as herbal tea in appropriate amounts under medical guidance. However, it is not recommended for individuals with excessive internal damp-heat or weak digestive function. If any abnormal reactions occur, timely medical consultation is advised. Detailed explanations are as follows:

When used for nourishing the liver and kidneys, improving blood deficiency, or strengthening a weak constitution, drinking Rehmannia glutinosa and Chinese yam as a tea may be beneficial. Rehmannia glutinosa has functions of nourishing yin and enriching blood, while Chinese yam can strengthen the spleen and benefit the kidneys. Combined, these two herbs can help alleviate symptoms such as fatigue and weakness in the lower back and knees caused by deficiency of the liver and kidneys. This combination is suitable for individuals with a cold constitution or those requiring gentle nourishment, but attention should be paid to controlling the dosage to avoid excessive intake, which may cause stomach discomfort or impair digestive function.

However, individuals with internal damp-heat symptoms or weak spleen and stomach function should avoid drinking this herbal tea. Rehmannia glutinosa has a greasy nature that may exacerbate internal accumulation of damp-heat, causing symptoms such as thick, greasy tongue coating, dry mouth, or bitter taste. Although Chinese yam is neutral in nature, excessive consumption may lead to abdominal distension or indigestion. Additionally, individuals currently taking other medications or suffering from chronic diseases should avoid consuming this combination indiscriminately, as it may interfere with treatment efficacy or exacerbate existing symptoms.

The effects achieved through routine consumption of this herbal tea are limited and cannot replace formal medical treatment. If necessary, treatment should be conducted under the guidance of a qualified physician.

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