The skin barrier, also known as the stratum corneum, is the outermost layer of your skin. Its main function is to protect your skin against chemicals, microbes, free radicals, and allergens. The good news is that there are numerous ways to strengthen your skin barrier. These tips are helpful if you have dry, rough, itchy, or sensitive skin. Remember, these skin conditions may indicate that the outermost layer of your skin is unable to function properly. So, how do you strengthen your skin barrier?