What it is
Polyvinyl alcohol is a synthetic polymer produced industrially by the partial or complete hydrolysis of polyvinyl acetate rather than by polymerizing a vinyl alcohol monomer. In skincare and sunscreen formulas it dries to a continuous flexible film, which helps deposit and hold other ingredients evenly on the skin and can lend a smooth, even finish. It is also a familiar base for peel-off mask formats because the film it forms can be lifted away as a single sheet.
Safety & warnings
Polyvinyl alcohol is generally well tolerated on intact skin and is widely used in topical and ophthalmic products. It is not classified as a notable fragrance allergen and is not an oil, so comedogenicity is not a relevant concern. As a film former it may feel tight or slightly drying for some users at higher levels.
Origin & sourcing
Synthetic. It is manufactured by hydrolyzing polyvinyl acetate, with the degree of hydrolysis and molecular weight controlling its solubility and film properties.
Questions everyone asks
Is polyvinyl alcohol natural or synthetic?
It is synthetic, made by hydrolyzing polyvinyl acetate to create a water-soluble polymer.
Why is it used in sunscreens?
It acts as a film former and viscosity modifier, helping the formula spread, set, and leave an even finish on the skin.