Namely
Polyaminopropyl biguamide or PHMB is a preservative used in liquid cosmetics. Its gentle nature makes it ideal for non-rinsing products such as hair care products, skin creams, skin lotions, baby products and wet wipes.
Restriction in Europe:
The maximum concentration allowed in ready-to-use cosmetic preparations is 0.3%.
Its functions (INCI)
Preservative : Inhibits the development of microorganisms in cosmetic products.