Hu Jiao (胡椒) — TCM Black Pepper for Stomach Cold & Cold Vomiting

At a Glance

Herb: Hu Jiao
Chinese name: 胡椒 (Hú Jiāo)
Latin name: Piperis Fructus
Nature: Hot
Taste: Acrid
Meridian: Stomach / Large Intestine
Category: Herbs that Warm the Interior and Expel Cold
Introduction: Hu Jiao (Fructus Piperis) is the fruit of Piper nigrum — used as black pepper (harvested unripe) or white pepper (ripe, with outer skin removed) — one of the world’s most consumed spices, introduced to China from India via the ancient Silk Road. First recorded in Chinese materia medica in the Xin Xiu Ben Cao (659 CE), this pungent and hot herb warms the Stomach, dispels Cold, descends rebellious Qi, and promotes digestion, with particular effectiveness for cold vomiting and diarrhea. Piperine, the primary pungent compound, demonstrates analgesic, antiemetic, anti-inflammatory, and significant bioavailability-enhancing properties in modern research. White pepper (Bai Hu Jiao) is preferred in TCM formulas for its more refined warming action, while black pepper is the culinary standard.

Cold vomiting, especially with clear watery fluids from Stomach Cold
Diarrhea and dysentery from Stomach and Intestine Cold
Abdominal cold pain and distension from Cold accumulation
Loss of appetite and weak digestion from Stomach Cold
Epilepsy from Phlegm-Cold accumulation (used in small doses in classical preparations)

Dose: 0.6–1.5 g as powder; 2–4 g in decoction
Contraindicated in Yin deficiency heat, hemorrhoidal bleeding from Heat, or excess heat patterns
Hot and irritating — avoid large doses which may cause gastric mucosa irritation, worsening ulcers from Heat
Avoid in pregnancy in medicinal doses
Piperine significantly increases bioavailability of many drugs and herbs — be aware of potential interactions

Hu Jiao Li Zhong Wan (胡椒理中丸) — Hu Jiao + Gan Jiang + Ren Shen + Bai Zhu, for Spleen-Stomach Cold deficiency with chronic diarrhea and cold pain
Used alone as powder (0.6–1.5 g) taken with warm water for acute cold vomiting
Combined with Bai Dou Kou and Ban Xia for nausea and poor appetite from Stomach Cold

Black Pepper (胡椒) + Long Pepper (荜茇) + Dried Ginger (干姜) → strongly warm the stomach; cold-type vomiting and severe gastric cold
Black Pepper (胡椒) + Atractylodes Rhizome (白术) + Poria (茯苓) → warm the Spleen, drain dampness; cold-damp diarrhea and abdominal pain

Thermogenic
- piperine — stimulates thermogenesis, raises metabolic rate
Bioavailability enhancer
- piperine — inhibits P-gp and CYP enzymes, increases absorption of curcumin, resveratrol, many drugs by up to 2000%
Anti-inflammatory
- piperine — inhibits NF-kB, COX-2
Analgesic; antimicrobial; antifungal; antioxidant; antidepressant
- MAO inhibition
antidiarrheal; carminative; hepatoprotective; externally: navel application warms the middl e jiao for cold-type conditions; NOTE: same bioavailability caution as 荜茇 regarding drug interactions

Xin Xiu Ben Cao (《新修本草》): ‘Governs descending qi, warming the middle, eliminating phlegm, and expelling wind-cold from the organs and bowels.’
Ben Cao Gang Mu (《本草纲目》): ‘Black Pepper is very acrid and hot — a pure yang substance; those with cold-damp in the intestines and stomach will benefit from it; those with febrile conditions who consume it will stir fire, damage qi, and harm the yin.’
Ben Cao Bei Yao (《本草备要》): ‘Acrid and hot; enters the Stomach and Large Intestine; warms the middle and descends qi; clears the diaphragm and disperses phlegm; treats cold-phlegm food accumulation, slippery-intestine cold dysentery, yin-toxin abdominal pain, and gastric cold with vomiting of fluids.’