This results-oriented skin care line, created by board certified dermatologist Dr. Zein Obagi, is clinically proven to help maintain the results of the therapeutic treatments, and provide effective daily skincare and protection for the environment. ZO® skin Health products contain high concentrations of stabilized retinol, advanced peptides and potent antioxidants to re-energize aging skin. The prescription-strength line is based on a 5-step process that is medically designed to: Stimulate skin changes at the cellular level, replenish collagen and elastin for firmer, smoother skin, encourage the skin's natural renewal and repair processes, soothe irritation and redness with anti-inflammatory agents and dramatically improve lines, wrinkles and imperfections.