The safety of Hair Straighteners and Relaxers is established by selection of ingredients that are safe and suitable for this purpose. In addition, Hair Straighteners and Relaxers are rigorously assessed for their potential to cause scalp and eye irritation. Product safety is also established though strict adherence to the principles of Quality Assurance and Good Manufacturing Practices. This includes testing the compatibility of the product with packaging as well as shelf-life stability. It is especially important to follow the directions on the label of the product to ensure that the product performs as intended and that there is no irritation to the skin.