Obagi Retinol 0.5 is a non-presription retinol that is highly effective at increasing cell turn over in the skin which in turn helps to visibly diminish signs of ageing. Minimal irritation will occur due to its formulation making it very tolerable to all skin types. Packaged in an airless pump to protect the potency of the product, Obagi Retinol 0.5 helps promote a healthy barrier and works on correcting a multitude of skin concerns including skin aging and pigmentation to name a few.