Phenylethyl Resorcinol ●
TL;DR. This ingredient is a targeted skin-tone active used to reduce visible discoloration by inhibiting tyrosinase, a copper-dependent enzyme involved in melanin production. It can also contribute antioxidant activity in a formula.
What does Phenylethyl Resorcinol do in a cosmetic formula?
This ingredient is a targeted skin-tone active used to reduce visible discoloration by inhibiting tyrosinase, a copper-dependent enzyme involved in melanin production. It can also contribute antioxidant activity in a formula.
Is Phenylethyl Resorcinol clean?
From a clean-beauty perspective, it is a synthetic, high-potency brightening active with some irritation or sensitization potential, especially at higher use levels or on reactive skin. It is not a classic restricted-list preservative, fragrance allergen, or UV filter, but its synthetic origin and pigment-modulating role create friction in stricter frameworks.
Is Phenylethyl Resorcinol sustainable?
This material is typically made through synthetic chemistry from aromatic feedstocks, rather than direct agricultural sourcing. Public biodegradability and aquatic-fate data are limited, so its sustainability profile is less favorable than readily biodegradable plant-derived humectants or fatty materials.
Is Phenylethyl Resorcinol COSMOS-approved?
It is not permitted as a standard ingredient under COSMOS-natural or COSMOS-organic because it is a synthetic aromatic brightening active outside the allowed natural-origin and approved synthetic categories. From a Green Chemistry view, it has weaker alignment on renewable feedstock and biodegradability transparency, though its low use level reduces total formula load.
How does Phenylethyl Resorcinol work chemically?
The molecule is a lipophilic substituted dihydroxybenzene with an aryl-ethyl side chain, designed to bind the copper-active site environment of tyrosinase more strongly than many older brightening agents. Typical cosmetic use is around 0.1% to 0.5% in leave-on products, with best formulation practice using solubilizers or an oil phase, mild pH, and protection from oxidation through air, light, and metal control.
Last updated 2026-05-13