Many straightening shampoos and conditioners contain elements like sodium laureth sulfate, sodium lauryl sulfate, tetrasodium EDTA , polyquaternium 10, sodium hydroxide, castor oil, methylchloroisothiazolinone, propylene, glycol, ammonium lauryl sulfate, glycerin, panthenol, quaternium 80, citric acid, diazolidinyl, urea, dimethiconol, triethanolamine, etc.