Flavonoids occur widely in the plant kingdom and are the source of colors of flowers, leaves, stalks, etc. From ancient times, flavonoids have been utilized as natural colors and as active constituents of galenicals / crude drugs and herbal medicines. The catechins are the chief ingredient of green tea, and they also are classified as a flavonoid.
Many flavonoids have a hydroxyl group in their structure and are called "polyphenols". Recently, polyphenols are in the spotlight for their various anti-oxidative properties and their ability to lower blood cholesterol levels.

C0705	E0694	H0385
H1024	H0234	H1025
T0121	H0379	H0945
H1026	H0955	M1409
H1238	H1027	H0851
M1403	M1346	D1916
H1006	H0852	M1423
A1514	B2835	C0958
C0071	C1652	D2668
F0255	F0015	G0272
H0721	H0049	I0669
K0018	M0338	P0041
N0072	N0073	P0042
S0508

C0705	(+)-Catechin Hydrate
E0694	(-)-Epigallocatechin Gallate Hydrate
H0385	2'-Hydroxychalcone
H1024	2'-Hydroxyflavanone
H0234	2-Hydroxychalcone
H1025	3'-Hydroxyflavanone
T0121	3,7,3',4'-Tetrahydroxyflavone
H0379	3-Hydroxyflavone
H0945	4'-Hydroxychalcone
H1026	4'-Hydroxyflavanone
H0955	4-Hydroxychalcone
M1409	4-Methoxychalcone
H1238	5-Hydroxyflavone
H1027	6-Hydroxyflavanone
H0851	6-Hydroxyflavone
M1403	6-Methoxyflavanone
M1346	6-Methoxyflavone
D1916	7,8-Dihydroxyflavone
H1006	7-Hydroxyflavanone
H0852	7-Hydroxyflavone
M1423	7-Methoxyflavone
A1514	Apigenin
B2835	Baicalin
C0958	Catechin Hydrate
C0071	Chalcone
C1652	Chrysin
D2668	Daidzein
F0255	Flavanone
F0015	Flavone
G0272	Genistein
H0721	Hesperetin
H0049	Hesperidin
I0669	Ipriflavone
K0018	Kaempferol
M0338	Methyl Hesperidine
P0041	Morin
N0072	Naringenin
N0073	Naringin Hydrate
P0042	Quercetin Hydrate
S0508	Silybin (mixture of Silybin A and Silybin B)