2B Human One is cheaper than buying each product separately. We did this to encourage you to purchase each step as all of the ingredients in the routine are designed to build on top of one another. It does not hurt to swap out products for other brands, but to get the best results, it is recommended to use all products together in the recommend order. In doing so, 2B Human One helps fight acne, smooth fine lines and wrinkles, hydrate and protect the skin.