As we age, cell turnover slows and dead skin cells pile up all over our face. Eventually these malingerers “reflect the light at odd angles and rob your face of radiance,” says New York City dermatologist Doris J. Day. It isn’t pretty. Whisk them away twice a week with an at-home glycolic acid peel, like Dr. Dennis Gross Skincare Alpha Beta Daily Face Peel or Avon Anew Clinical Advanced Retexturizing Peel.