A chemical ingredient used in some hair relaxing and/or straigtening products that is designed to break the protein bonds that provide human hair with its natural texture. Ammonium Thioglycolate is often called "thio". It is the active chemical ingredient that is also found in chemical waving treatments.
Daily Hair Tip
A good volumizing trick is to mix equal parts of hair mousse and gel together and then paint sparingly on the roots of your hair before blow drying with a make-up brush.