ATZEN products are designed to work together to maximize each product's effectiveness. The ingredients work in synergy and don't conflict with each other to deliver unparalleled results. We recommend you use only our cleansers, toners, moisturizers, serums, sun protection, scrubs and masks for best results, and use them consistently for all the years to come. From years of experience it is proven that ATZEN loyal users look younger and have healthier-looking skin. The difference is dramatic.