Both ZO Skin Health and Obagi share a deep clinical heritage rooted in the expertise of renowned dermatologist Dr. Zein Obagi, making direct comparisons subjective based on personal skin tolerance. ZO Skin Health tends to focus heavily on continuous skin conditioning, barrier health, and advanced daily maintenance protocols using cutting-edge delivery systems. In contrast, traditional Obagi lines—such as the Nu-Derm system—are often favored for aggressive, transformative correction of severe sun damage, melasma, and hyperpigmentation under strict medical supervision.