Shi Hu (石斛) — TCM Herb for Stomach Yin, Thirst, Kidney Deficiency & Vision

At a Glance

Herb: Shi Hu
Chinese name: 石斛 (Shí Hú)
Latin name: Dendrobii Caulis
Nature: Slightly Cold
Taste: Sweet
Meridian: Stomach / Kidney
Category: Herbs that Tonify Yin
Introduction: 石斛 (Shí Hú, Dendrobium Stem) is the dried stem of Dendrobium nobile, D. chrysotoxum, D. fimbriatum, or several related orchid species in the Orchidaceae family. Wild Dendrobium is now endangered; the majority is cultivated. Iron Skin Dendrobium (铁皮石斛, D. officinale) commands the highest market value for its superior polysaccharide content and mucilaginous quality. Fresh stem is used for acute febrile conditions; dried stem for tonic purposes.
In TCM theory, Shi Hu nourishes stomach yin and generates fluids, clears stomach heat, nourishes kidney yin, and brightens the eyes. It is a premier herb for stomach yin deficiency — characterized by dry mouth and throat, thirst without desire to drink much, hunger without appetite, and constipation from fluid insufficiency. It also nurtures kidney yin to strengthen lower back and knees and improve vision.

Among the classical Nine Immortal Herbs of Daoist tradition (仙草), Shi Hu is prized for its ability to nourish and moisten without being cloying. Modern research highlights its polysaccharides as primary bioactives with immunostimulatory, antidiabetic, anti-aging, and anti-tumor properties.

Nourishes stomach yin and generates fluids (益胃生津): For stomach yin deficiency — dry mouth, thirst, hunger without appetite, epigastric pain from dryness.
Clears stomach heat (清胃热): For stomach heat injuring yin — dry retching, hiccup from heat, epigastric burning sensation.
Nourishes kidney yin (滋肾阴): For kidney yin deficiency — lower back soreness, weak knees, bone steaming fever.
Brightens the eyes (明目): For liver-kidney yin deficiency causing blurred vision, diminished night vision, eye dryness.

Clinical Application:
Stomach yin deficiency thirst: 15–30g fresh or 6–12g dried, with Sha Shen, Mai Dong, Yu Zhu (Ye Wei Tang)
Febrile disease late stage fluid depletion: With Sheng Di Huang, Xuan Shen, Mai Dong (Zeng Ye Tang)
Diabetic dry mouth and thirst: With Tian Hua Fen, Ge Gen, Zhi Mu
Kidney yin deficiency lower back weakness: With Gou Qi Zi, Sang Ji Sheng, Du Zhong
Liver-kidney yin deficiency vision: With Ju Hua, Gou Qi Zi, Jue Ming Zi
Dosage: 6–12g dried stem in decoction (decoct first 30 min); 15–30g fresh stem. Iron Skin variety preferred for highest potency.

Use cautiously in damp-heat or phlegm-damp patterns — sweet-moistening nature may aggravate dampness. Not appropriate for exterior conditions or early-stage febrile diseases. Avoid raw Shi Hu in cold-deficiency of spleen-stomach. Dendrobine alkaloids (mainly in D. nobile) can increase contractility and respiration at high doses — standard therapeutic doses are safe. Decoct first (30 min before other herbs) for dried stem to extract polysaccharides.

Ye Wei Tang (益胃汤): Sha Shen, Mai Dong, Sheng Di Huang, Yu Zhu, Bing Tang — with Shi Hu added for stomach yin deficiency.
Shi Hu Ye Guang Wan (石斛夜光丸): Shi Hu, Gou Qi Zi, Ju Hua, Ren Shen, Shan Yao, Shu Di Huang and 20+ herbs — for liver-kidney deficiency with progressive vision loss.

Shi Hu + Sha Shen: Nourishes stomach-lung yin, generates fluids; for stomach yin deficiency thirst and dry cough. Source: Ye Wei Tang (益胃汤), Wen Bing Tiao Bian (温病条辨).
Shi Hu + Sheng Di Huang: Nourishes yin, cools blood, generates fluids; for febrile disease fluid depletion. Source: Zeng Ye Tang (增液汤).
Shi Hu + Gou Qi Zi: Nourishes liver-kidney yin, brightens eyes; for blurred vision from deficiency. Source: Shi Hu Ye Guang Wan (石斛夜光丸).
Shi Hu + Mai Dong: Strongly nourishes stomach yin, clears heat, moistens dryness; for dry mouth, thirst, constipation. Source: Ye Wei Tang.
Shi Hu + Ju Hua: Clears liver-kidney heat, brightens vision; for dry eyes and diminished vision. Source: Shi Hu Ye Guang Wan (石斛夜光丸).

Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs internal injury, eliminates impediment, descends qi, supplements deficiency taxation and emaciation of the five organs, strengthens yin; long-term use thickens the intestines and Stomach, lightens the body, and extends years.’
Ben Cao Gang Mu (《本草纲目》): ‘Clears deficiency heat in the Stomach, generates fluids, benefits the throat, nourishes yin and strengthens original qi, removes internal injury deficiency damage, strengthens yin.’
Ben Cao Bei Yao (《本草备要》): ‘Sweet, bland, slightly salty; clears the Stomach and eliminates deficiency heat, generates fluids and addresses taxation damage; used in place of tea, opens the appetite and strengthens the Spleen.’