The product: Obagi Nu-Derm Clear Fx ($104)
Barrymore's review: "I am a long time fan of Obagi Medical. 3 Clear is a gentle little lightener and Number 5 Blender can be combined to dilute retinols. The whole line and collection has been around for many many years, and it is a staple of dermatologists. I am a long time fan. They have a ton of products. Maybe seek it out and see if there is anything that is suitable for you. Skin is so important for me and this powerful but attainable line is very effective!"