When to use obagi clear and blender?

These are questions for the skin care doctor who is following you and overseeing your use if the Nu-Derm System. However, to answer your question, Clear is applied both in the morning and at night.  Usually, at night, you are applying ELASTIderm between the Clear and Blender/Tretenoin. Also, the bottles have the order and whether they are AM, PM or both.