"I'm a big believer in vitamin C treatments to boost collagen," says Audrey Kunin, M.D., founder of Dermadoctor. She uses SkinCeuticals C E Ferulic, $138 daily and applies it to her face and decollete. "Don't forget your neck, decollete, arms, hands. They really give away your age," she warns.

Amy Wechsler, M.D., author of "The Mind-Beauty Connection," protects her skin from free-radical damage by filling up on anti-oxidant rich foods and beverages. "I drink a lot of green tea and eat anti-oxidants in the form of fruits, and a little dark chocolate," she says. "Ingesting anti-oxidants combats the oxidant stress and damage done to cells by aging, stress, smoking and UV rays."

Getting rid of sun damage and discoloration is important to Katie Rodan, co-founder of Proactiv and Rodan + Fields Dermatologists. "I do all of the lasers, but topicals do a much better job of evening out the skin tone and they're less expensive," she says. She recommends exfoliation and applying topicals containing hydroquinone all over your whole face, "don't spot treat," she says.

"I take vitamin D3 oil," says Kathy Fields, M.D., co-founder of Proactiv and Rodan + Fields Dermatologists. "It's the new E or A." She explains that you can be in the sun all day and not make enough of it (vitamin D has been linked to bone health and cancer risk). According to Fields the American Academy of Dermatologists recommends taking a supplement of 1,000 ius a day. Fields recommends to "get [your Vitamin D level] tested to find out where you are," she says, then take a supplement if necessary.

"Brush your teeth after you drink coffee, you want to keep your teeth white," says Rodan, who is a fan of Crest Whitestrips, $34." She claims whiter teeth "enhance the appearance of your skin tone."