Since hydroxy acids heighten the skin's sensitivity to ultraviolet radiation, users should always slop on sunscreen (at least SPF 2, higher if you spend much time outdoors).
The key ingredient, alpha hydroxy acid, is found in many antiaging products and helps exfoliate the top layers of skin to reveal fresher skin underneath.
There are antioxidants for preventing skin damage from exposure to the sun, copper peptides for stimulating skin repair and hydroxy acids for sloughing off layers of dead skin.