Sodium Lauryl Sulfoacetate (SLSA) is a natural alternative to Sodium Laurel Sulfate (SLS). It is derived from coconut and palm oils, and conforms to Ecocert's natural and organic cosmetic standard and is 100% of natural origin. Though Sodium Laurel Sulfate (SLS) and SLSA look and sound very similar, they are not the same. Many people assume SLSA is a sulfate because of it's name (Sodium Lauryl Sulfoacetate); however, it is not. This product contains no sodium chloride, sulfates, parabens, gluten or drying alcohols. As it relates to the Red 40; we rely on the website www.ewg.org/skindeep for identifying and/or explaining ingredients that raise concerns. The level of Red 40 (used for coloring in food or cosmetics) that is in our shampoo is rated as Green (safe). It contains far less than 1% and is the next to last ingredient on the list. The studies done in developing rats included Red 40 at doses of up to 10% of the diet, which then reflected some of the health concerns you see when perusing google. Again, this product contains far less than 1%.