Experts advise that such preparations be applied for a very brief period, followed by thorough rinsing and sun protection. Another study found that skin treated with AHA had twice the sun damage as areas not treated with it. If any adverse effects occur, the product should be stopped immediately. In any case, people are advised to avoid sunlight or use proper protection when using them. Research is underway to determine conclusively long-term adverse effects.
Manufacturers claim that such products are less likely to irritate the skin.
Antioxidants and Vitamins. Such products may contain vitamins E or C, beta carotene, coral extracts, aloe, topical aspirin, or ibuprofen. Some dermatologists recommend that their patients take 400 IU of vitamin E daily. Vitamin E, as well as the trace mineral selenium, are believed to help decrease sun damage. Large amounts of vitamin C, or ascorbic acid, appear to help reduce swelling from sunlight, and long-term use may promote production of collagen.