A 20-ingredient Chinese herbal formula, administered in dried powder form and encapsulated, proved effective for relieving symptoms of irritable bowel syndrome.

Chinese Name	Pharmaceutical Name	Powdered Herb %
Yin Chen	Artemisiae capillaris, herba	13
Bal Zhu	Atractylodis macrocephalae, rhizoma	9
Dang Shen	Codonopsis pilosulae, radix	7
Wu Wei Zi	Shisandrae, fructus	7
Yi Yi Ren	Coicis lachryma-jobi, semen	7
Chai Hu	Bupleurum chinense	4.5
Che Qian Zi	Plantaginis, semen	4.5
Fu Ling	Poriae cocos, sclerotium (Hoelen)	4.5
Hou Po	Magnoliae officinalis, cortex	4.5
Huang Bai	Phellodendri, cortex	4.5
Huo Xiang	Agastaches seu pogostemi, herba	4.5
Pao Jiang	Zingiberis offinicinalis, rhizoma	4.5
Qin Pi	Fraxini, cortex	4.5
Zhi Gan Cao	Glycyrrhizae uralensis, radix	4.5
Bai Shao	Paeoniae lactiflorae, radix	3
Chen Pi	Citri reticulatae, pericarpium	3
Fang Feng	Ledebouriellae sesloidis, radix	3
Huang Lian	Coptidis, rhizoma	3
Mu Xiang	Saussureae seu vladimirae, radix	3
Bai Zhi	Angelicae dahuricae, radix	2

Source: Journal of the American Medical Association 1998 Nov 11;280(18):1586.