Your complexion can look dull and prematurely aged if it does not shed old skin cells effectively each day. Stubborn cells that have outlived their usefulness can cause lines and wrinkles to be more noticeable. When you want to increase skin cell turnover and reveal a more youthful complexion, you may consider using products containing alpha hydroxy acids (AHAs). These compounds encourage the exfoliation of old skin cells while also encouraging new cells to rise to the surface. AHAs help your skin remain soft, supple and radiant. Glycolic acid, lactic acid, citric acid and malic acid are all AHAs which can be found in skin care treatments. Each of these potent ingredients has a slightly different action on the skin. To achieve the best results, skin care professionals suggest that you should choose the AHA best suited to your skin type or combine acids for a stronger effect.