Speaking of amino acid shampoo, some manufacturers add a little amino acid ingredients (such as lysine and other common ingredients) to the shampoo and say that the shampoo is amino acid shampoo. This statement cannot be said to be wrong, but it is definitely not rigorous enough. The real amino acid shampoo is a shampoo with most amino acid surfactants added. The surfactant plays a cleaning role in the shampoo. For example, the dioxane incident of a certain shampoo is related to its main surfactant AES. Therefore, if all AES are replaced with amino acid surfactants, then at least the carcinogen dioxane can be avoided. In addition, because amino acids are the main components of human tissues and hair, amino acids are substances that the skin and hair have themselves, so the skin and hair will not reject them. Most surfactants are irritating to the skin, but the irritation will show different irritation due to the type of surfactant, the nature of the dissociated ions, and the size and geometry of the microscopic micelles formed. Amino acid surfactants are one of the mildest surfactants known so far. Therefore, using this type of surfactant in shampoo instead of commonly used AES will be an optional way to safe and mild shampoo.