Which herb tonifies the Kidney and helps with constipation?

• A. Shan Yao
• B. Suo Yang
• C. Du Zhong
• D. Lu Rong

Answer: (B)

The kidneys provide the foundation for the body’s vitality and the movement of the lower burner. When kidney yang is deficient, the body’s driving force for intestinal peristalsis weakens, leading to constipation from deficiency patterns. A herb that warms and tonifies kidney yang can restore that movement by boosting the body’s essential warmth and moisture, helping stools move more easily.

Suo Yang is a warm, kidney-yang tonic that strengthens the kidney and supports the body's vital energy. By reinforcing kidney function, it helps improve the drive and moisture in the lower burner, which can relieve constipation associated with kidney deficiency. It’s especially favored for deficiency-related symptoms like fatigue, backache, and weak limbs, where constipation often accompanies the overall decline in vitality.

Shan Yao also tonifies kidney and spleen and is great for chronic diarrhea and general qi deficiency, but it isn’t as directly targeted to the constipation that stems from kidney yang deficiency as Suo Yang. Du Zhong is more about supporting the lower back and structural support, not specifically about bowel movement. Lu Rong is a very strong, top-tier tonic used for severe deficiency and Jing upbuilding, but it’s typically reserved for more extreme cases and not the typical first-line remedy for constipation caused by kidney deficiency.