The barrier is the skin's natural immune system and defends it against pollution, UV light, and infection. Harsh foaming cleansers can cause it damage and strip the skin of its natural oils. The Nue Co. Barrier Culture Cleanser works to reverse these effects and rebuild and protect the barrier. Its gentle soap-free, sulfate-free formula deep cleans the skin to remove dirt and pollutions, while a proprietary blend of prebiotics, probiotics, and postbiotics replenish the topical microbiome for improved moisture, texture, and tone. For the best results, follow up with The Nue. Co Barrier Culture Moisturizer.