Table 1. Flavonoids isolated from traditional Chinese medicine in treatment of AD.

Agents	Structures or contents	Typical origin	Reference
Gingko flavonoids	Mixture: mainly including quercetin, kaempferol, isorhamnetin, and biflavonoids like ginkgetin, isoginkgetin, and amentoflavone	Ginkgo biloba L. leaves	36,37
Soy isoflavones	Mixture: mainly including daidzin, daidzein, genistin, genistein, and glycitin, glycitein	Glycine max	41,42
Total flavonoids of Baical Skullcap stem and leaf	Mixture: mainly including scutellarin, baicalin, and chrysin	Radix puerariae roots	64
Puerarin		Scutellaria baicalensis Georgi stems and leaves	69
Liquiritin		Glycyrrhiza uralensis Fisch. roots	73
Apigenin		Apium graveolens	76
Hyperin		Hypericum perforatum L.	81
Rhodosin		Rhodiola rosea	83