Question: what is the difference between obagi blender and blend fx?
Answer: Obagi Nu-Derm Blender (step 5) contains Hydroquinone 4% (HQ), prescription is required (Rx only). Whereas, Obagi-Nu-Derm Blend Fx is Hydroquinone Free (no HQ), Arbutin Formulated, does not require a prescription (OTC).