It’s a surfactant of vegetable origin. It comes from coconut and improves the texture of the serum. Not to be confused with SLS, which is unsafe and syntheticSLSA is a natural substance derived from coconut, not to be confused with SLS, which is an irritant, and usually synthetic - SLSA brings to the table many elements that are very beneficial to the skin. What might just be the greatest quality of this surfactant is that it can be used on every type of skin and hair. We feel this characteristic is important, and products with SLSA work really nicely for people with dry and sensitive skin. There are so many different skin conditions out there such as eczema, rosacea, acne, and psoriasis. We want to be able to cater to our customers and provide them with products that will work for all types of skin. This is just one of the reasons we decided to add SLSA to our products.