The man behind Obagi products, ZO Skin Health and ZO Medical is genius and his products WORKS! Trust me if you have tried it once, you will never go back. Like in other things in life you pay for what you get. I was introduced to these wonderful products by my fantastic physician. One of my favourite products during the summer are the Obagi Professional-C Serum and Nu-Derm Sun Shield SPF 50, this is the perfect duo during the summer!