For optimum results—and maximum penetration—apply products in the right order, says Doris Day, a dermatologist in N.Y.C. First use the lightest product (usually a serum), followed by heavier formulas. For instance, in the morning apply an antioxidant serum, then a moisturizer, and cap it off with sunscreen.
STEP 1: SMOOTH ON SERUM
Lancôme Génifique Youth Activating serum ($84; at lancome-usa.com).
STEP 2: APPLY MOISTURIZER
Estée Lauder Hydrationist Moisture Crème ($38; at esteelauder.com).
STEP 3: FINISH WITH SUNSCREEN
Anthelios 15 sunscreen ($30; at CVS).Read MoreLess