Table 1.

Main groups of polyphenols that have been pointed out for exercising antiaging effects, and some examples of representative compounds of each group. Polyphenols are structurally characterized by having several aromatic rings connected to hydroxyl groups.

STILBENES Resveratrol	(3,4′,5-Trihydroxy-trans-stilbene, 5-((1E)-2-(4-hydroxyphenyl)ethenyl)-1,3-benzenediol)
FLAVONOIDS Quercetin	(2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-1-benzopyran-4-one, 3,3′,4′,5,6-Pentahydroxyflavone, Quercetin-3-O-rhamnoside)
Naringenin	((±)-Naringenin, (±)-2,3-Dihydro-5,7-dihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one, 4′,5,7-Trihydroxyflavanone)
FLAVOLIGNAN Silymarin	((2R,3S)-3,5,7-Trihydroxy-2-((2R)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl)-2,3-dihydro-4H-chromen-4-one)