According to paulaschoice.com,
“Usually listed on ingredient labels as PVP or PVP copolymer, it is one of the primary ingredients used in hairstyling products to hold hair in place. When present in minuscule amounts in skin-care products, it places an imperceptible film over the skin that is considered to be water-binding and that helps give the appearance of firmer skin. It can aggravate skin for some individuals.”

Source: https://www.paulaschoice.com/ingredient-dictionary/texture-enhancer/polyvinylpyrrolidone.html


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