As skin ages, just like the body, it loses the ability to properly renew itself. The Obagi Nu-Derm System is a prescription strength skin care system that is physician monitored to accelerate skin cell turnover so that it looks and acts younger and healthier. Obagi System skin care products are prescription strength, or pharmaceutical quality products that work at the cellular level to improve the skin cell function. Products purchased from a retail store are Cosmeceutical products. When applied, they do not correct skin cells, instead they “mask” the damaged skin only on the surface of the skin for a temporary period.