Cosmetic oils or nutrients are highly susceptible to microbial infections and deteriorate, resulting in reduced product quality. In cosmetics, the role of preservatives is to prevent products from microbial contamination, extend the shelf life of products, and ensure product safety. The main component of cosmetic preservatives is PHMB. As a medical grade fungicide (polyhexamethylene biguanide hydrochloride), it is widely used in medical supplies sterilization, daily chemical products, wet wipes, etc. Safe, non-toxic, tasteless, chlorine-free, iodine, mercury, aldehyde, phenol and heavy metal products, completely killing all kinds of bacteria, microorganisms, viruses, etc.! The general mechanism of action of preservatives is described below: