Avoid shampoos and conditioners that contain Propylene Glycol (what looks like PG or PEG on a label). This chemical, commonly found in your favorite hair care products,  is also one of the main ingredients in car antifreeze. Other ingredients such as Diethanolamine, Monoethanolamine, Triethanolamine and Sodium Lauryl Sulfate ( a chemical that makes products lather)  should be avoided too. These chemicals are linked to cancers and/or skin irritation at the very least.If you have the time, try making your own shampoo with witch hazel, castile soap and essential oils. If this is not an option, research green product companies that use ingredients kind to your health and your environment.  Natural and health food stores, and even some chain stores like target are now carrying toxic free personal products. Also, talk to you hair stylist about switching to safer, healthier products when getting your hair done. Check out the back of the booklet for do it yourself recipes.