SLS stands for Sodium Lauryl Sulfate, which is a surfactant used in many personal care and cleaning products. It is a cleaning agent and foaming agent that is used in products such as toothpaste, shampoo, soap, and household cleaning products. SLS is also used as a food additive in certain foods, such as marshmallows and dried egg products, to make them fluffier and lighter. While SLS is generally considered safe for use in personal care and cleaning products, it can cause skin irritation in some people, especially those with sensitive skin or skin conditions such as rosacea or psoriasis. However, concentrations of one percent or less are generally considered safe on the skin. SLES (Sodium Laureth Sulfate) is a gentler surfactant compared to SLS and is found to be less likely to irritate skin and eyes.