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You probably already know the three surest ways to ensure youthful skin: Protect your skin from the sun, don't smoke, and eat a healthy diet.

In addition, a variety of vitamins and antioxidants may also improve the health and quality of your skin. Here are a few of the most effective ones:

Vitamins C and E and Selenium for Your Skin

Research has found that vitamins C and E, as well as selenium, can help protect the skin against sun damage and skin cancer. And they may actually reverse some of the discoloration and wrinkles associated with aging. These antioxidants work by speeding up the skin's natural repair systems and by directly inhibiting further damage, says Karen E. Burke, MD, PhD, of the Mount Sinai School of Medicine's department of dermatology.

Burke recommends taking supplements containing 1,000 to 3,000 milligrams of vitamin C, 400 international units of vitamin E (in the D-alpha-tocopherol form), and 100-200 micrograms of selenium (l-selenomethionine) to gain the most benefit. (Don't give selenium to children until they have all of their adult teeth because it can interfere with the proper formation of tooth enamel.)

Coenzyme Q10 for Your Skin

Coenzyme Q10 is a natural antioxidant in the body that helps the cells grow and protects them from the ravages of cancer. A drop in natural levels of coenzyme Q10 that occurs in our later years is thought to contribute to aging skin. A study published in the journal Biofactors found that applying coenzyme Q10 to the skin helped minimize the appearance of wrinkles. Most studies conducted so far have used a 0.3% concentration of it.

Alpha-lipoic Acid for Your Skin

This antioxidant, when applied topically as a cream, may help protect the skin from sun damage. Studies have looked at creams with 3%-5% concentration, applied every other day and building up slowly to once daily, and found some improvement in sun-induced changes in the skin. 

Retinoic Acid for Your Skin

Retinoic acid is the active form of vitamin A in the skin and the "gold standard" in anti-aging skin care, according to Burke. Topical retinoic acid (brand names Renova and Retin-A) treats fine wrinkles, age spots, and rough skin caused by sun exposure. In a study published in the Journal of Dermatological Science, researchers found that treatment with retinoic acid restored the elastic fibers that keep skin taut, and reduced the appearance of wrinkles.

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