Chemical sunscreens contain filters that absorb UV light. Those approved by the FDA for sale in the US contain one or more of the following active ingredients (PDF): avobenzone, cinoxate, dioxybenzone, ensulizole, homosalate, meradimate, octinoxate, octisalate, octocrylene, oxybenzone, padimate O, or sulisobenzone. (The FDA is working with sunscreen makers to further establish the safety and efficacy of these 12 UV filters.) Compared with physical and combination sunscreens, chemical formulas generally rub in easier, blend well with other skin-care and makeup products, and look and feel less noticeable on the skin.