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References Boehnlein, J., et al. "Metabolism of retinyl palmitate to retinal (vitamin A) in skin during percutaneous absorption/metabolism studies." Pharm Res, 1994;11:1155-1159. Ji, H.G. & Seo, B.S. "Retinyl palmitate at 5 percent in a cream: its stability, efficacy and effect." Cosmet Toil, 1999;114:61-68. The Doctors' Prescription Facial masks are important because they not only provide important rejuvenating and beautifying benefits for the skin; they rejuvenate our senses, relieve stress and enhance well being. We want the products we purchase to contain beneficial nutrients and botanicals; however, because of enhanced skin penetration, we also must be sure to avoid irritating and toxic ingredients. After all, this is a time for pampering ourselves, not adding more environmental toxins. Fortunately, facial masks from Aubrey Organics, Burt's Bees, Dr. Hauschka, Kiss My Face and Weleda all fulfill these high standards for purity. Other masks that we have reviewed from more mainstream companies do not meet our standards because of their use of ingredients like polyethylene glycol, propylene glycol, and artificial colors and fragrances; these substances may be irritating or even contain possible cancer-causing impurities. Our recommended masks are available at health food stores and natural product supermarkets. Choosing the Right Mask