What it is
Phenylethyl Resorcinol is a synthetic resorcinol derivative used at low levels for its tone-evening properties, helping to reduce the look of uneven pigmentation. It also has antioxidant character. In sunscreens it is paired with UV filters to address both protection and the appearance of discoloration.
Safety & warnings
Used at low concentrations in finished products. As a resorcinol-type compound it can be sensitive to oxidation and is typically stabilized in formula; some users with reactive skin may wish to patch test brightening actives. It is not a recognized fragrance allergen.
Origin & sourcing
Synthetic; a resorcinol-based molecule produced by chemical synthesis.
Questions everyone asks
What is Phenylethyl Resorcinol used for?
It is a brightening active used to help even out the look of skin tone and reduce the appearance of dark spots.
Why combine it with sunscreen?
Pairing a tone-evening active with UV filters lets a single product address both protection from light and the appearance of discoloration.