Hydroxy Acids, known for noticeable results in exfoliation, improving the appearance of wrinkles, and attacking the effects of photoaging, have enjoyed a cult-like following in recent years. Alpha Hydroxy Acids (AHA’s) are derived from fruit and milk sugars. One of the most effective, Glycolic Acid, is produced from sugar cane, and is shown to lessen lines, fade sun spots and acne scars, and increase moisture retention. Find it in the Estee Lauder Perfectionist Peel ($85 for 30 pads)