SOURCES: Diane Madfes, MD, clinical instructor, dermatology, Mt. Sinai School of Medicine. WebMD Feature: "Natural Skin Care Treatments." WebMD Weight Loss Clinic Feature: "The Antiaging Diet." WebMD Medical Reference provided in collaboration with the Cleveland Clinic: "Cosmetic Procedures: Choosing Skin Care Products." The Dermadoctor Skinstruction Manual, Audrey Kunin, MD, Simon & Schuster, 2005. Mayo Clinic website: "Wrinkles." PDRHealth, "Biotin."

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