Avoid Propylene Glycol

This active ingredient is found in engine coolants and antifreeze, airplane de-icers, tire sealants, rubber cleaners, polyurethane cushions, paints, adhesives, enamels and varnishes, and in many products as a solvent or surfactant. And guess what? Despite the fact the material safety data sheet warns users to avoid skin contact with propylene glycol as it is a strong skin irritant and can also cause liver abnormalities and kidney damage, its more than likely in your shampoo!