Chinese Yam (Shan Yao)
山药 · Shānyào
Dioscorea opposita (D. polystachya)
Family: Dioscoreaceae · Part used: Rhizome · Origin: Jiaozuo, Henan (Tiegun Shan Yao), China
Nature
Neutral
Flavor
Sweet
Meridian
Spleen, Lung, Kidney
The iron-stick yam of Henan's Huai region is simultaneously a revered medicine and a beloved food — the epitome of the Chinese principle that food is medicine. Neutral and sweet, it gently tonifies the spleen, lung, and kidney without cloying, making it safe for children, elders, and long-term convalescence.
🌿 Functions & Actions
- •Tonifies spleen qi and yin
- •Nourishes lung yin
- •Tonifies kidney and secures essence
- •Astringes and stops leakage
📋 Traditional Indications
- •Poor appetite and loose stools
- •Chronic cough from lung deficiency
- •Frequent urination and cloudy urine
- •Excessive leukorrhea
- •Fatigue and emaciation
- •Infant and elder digestive weakness
📖 Usage & Dosage
15–30 g dried (or fresh, steamed) in soups and congee; fresh shan yao slices are delicious simply steamed with honey.
🍵 Classic Recipes
Shan Yao Porridge
Fresh yam 100 g + rice, simmered 40 minutes — the gentle daily tonic for weak digestion.
Si Shen Tang
Yam + lotus seed + poria + euryale seed simmered with pork intestine (or vegetables) — the classic spleen-astringing soup.
🔬 Modern Research
Yam mucilage polysaccharides and diosgenin precursors are studied for digestive-mucosa support, glycemic modulation, and prebiotic effects.
⚠️ Contraindications
Avoid with damp-heat patterns and abdominal distension. Fresh yam sap can irritate skin of sensitive hands.
