"No-lye" refers to a type of hair relaxer that does not contain lye, a strong alkaline chemical. Instead, it typically uses alternative ingredients like guanidine hydroxide or calcium hydroxide. These relaxers are often marketed as gentler on the hair and scalp, making them a popular choice for individuals with sensitive skin or those looking to minimize damage. While no-lye relaxers can be less harsh, they still alter the hair's structure, allowing for smoother and straighter styles. It's important to follow the instructions carefully and perform a patch test to avoid adverse reactions, especially for those with curly or textured hair types like African American hair.