Does Rehmannia glutinosa (Shu Di Huang) and Codonopsis pilosula (Dang Shen) reduce fire (heat) in the body?

Apr 14, 2025 Source: Cainiu Health

Dr. Zhang Xiuhong

Introduction

The three traditional Chinese herbs, Shu Di Huang (Rehmannia glutinosa), Dang Gui (Angelica sinensis), and Dang Shen (Codonopsis pilosula), are primarily used in TCM theory for nourishing blood, enriching yin, and invigorating qi, rather than directly reducing excessive internal heat. If the symptoms of excessive heat are caused by excess fire or internal accumulation of damp-heat, such as oral ulcers, constipation, and dark, scanty urine, using Shu Di Huang, Dang Gui, and Dang Shen alone may be ineffective and could potentially worsen the symptoms due to their greasy and nourishing properties.

Rehmannia glutinosa, angelica sinensis, and codonopsis pilosula generally do not reduce internal heat. If discomfort occurs, it is recommended to seek medical attention at a hospital promptly and follow the doctor's instructions for treatment.

In traditional Chinese medicine theory, these three herbs—Rehmannia glutinosa, angelica sinensis, and codonopsis pilosula—are primarily used for nourishing blood, enriching yin, and boosting qi, rather than directly reducing internal heat. If symptoms of excessive heat or damp-heat are present, such as mouth ulcers, dry stools, or short, dark urine, using Rehmannia glutinosa, angelica sinensis, and codonopsis pilosula alone may not be effective and might even exacerbate symptoms due to their greasy and nourishing properties. In such cases, other heat-clearing and detoxifying herbs, such as coptis and scutellaria, should be combined in the prescription.

Rehmannia glutinosa itself does not have the effect of reducing internal heat. Excessive dosage or prolonged use may even cause symptoms of heatiness, such as mouth ulcers and sore throat. Angelica sinensis also does not have heat-reducing properties; improper use may lead to symptoms of heatiness, such as dry mouth and throat pain. Codonopsis pilosula has functions of strengthening the spleen and lungs, nourishing blood, and promoting body fluid production, but generally does not reduce internal heat.

Attention should also be paid to adjusting dietary habits and lifestyle during medication to promote drug absorption and body recovery.

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