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| Credit: Rita Maas

Also known as: 4-hydroxy-3-methoxycinnamic acid.
 
Good for:
Dry skin, normal skin.
 
What it treats:
Sun damage, aging.
 
How it works:
Usually combined with vitamins C and E, "ferulic acid helps stabilize them," says Barbara R. Reed, a clinical professor of dermatology at the University of Colorado Health Science Center, in Denver. This doubles their power as sun-protective agents and boosts their ability to neutralize free radicals.
 
RS
 pick: SkinCeuticals CE Ferulic serum, $135, skinceuticals.com for store locations.