What to look for on the label: Vitamin C, idebenone, green tea, vitamin E, ferulic acid, phloretin and coenzyme Q10. Vitamin C is a favorite among doctors because it has been shown to not only fight free radicals but also encourage collagen production. Choose a vitamin C product that contains L-ascorbic acid, one of the more stable forms. It needs to be at a relatively low pH; though you won't see pH on the label, you'll know the level is about right if your skin tingles for a minute after you apply the product.
For best results: "A mix of antioxidants, which all tackle free radicals a bit differently, creates the best offense," says dermatologist Leslie Baumann, MD, director of the Baumann Cosmetic & Research Institute in Miami. An example of an effective regimen: Layer a serum with vitamins C and E under your sunscreen in the morning and a lotion with green tea over your retinoid in the evening.
You should know: Antioxidants (vitamin C in particular) are notoriously susceptible to air and light. To be effective, they must be packaged in an airtight, opaque pump or tube.
iS Clinical C & E Serum Advance+ ($128; dermstore.com)
Givenchy No Surgetics Plasti Sculpt Eye Lifting Gel ($81; sephora.com)