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According to research, it is an antioxidant that is believed to effectively affect the formation of pigmentation and help solve skin discoloration and uneven skin tone.

This ingredient (phenethyl resorcinol) whitens the skin by inhibiting the synthesis of melanin in B16V cells. In addition, phenethyl resorcinol (PER, 4-(1-phenylethyl)1,3-benzenediol) has an antioxidant effect, can provide antioxidant protection, can increase skin elasticity, and reduce UV-induced pigmentation and hair Pigmentation, resist the oxidative stress of free radicals in the environment.

According to reports, this raw material is safe and stable. The recommended value is 0.1–1.0%. The formulator should use this ingredient at a pH of 4-5 and avoid using it with Carbomer, as the pH neutralization will exceed 5.5. Preferred thickeners/stabilizers include ammonium acryloyl dimethyl taurate/VP copolymer, xanthan gum, arabinogalactan, and hydroxyethylcellulose, which are stable at low pH.

Ultraviolet radiation may cause discoloration of raw materials. UV absorbers such as benzophenone 3 improve color stability; in addition, adding about 0.1% of a chelating agent to formulations containing resorcinol can help prevent discoloration.

Formulators must check the compatibility of nitrogen-containing active substances (such as amino acids, urea, and protein) with the raw materials before adding them to the formula. It should also be noted that resorcinol may cause the instability of certain fragrances.

Phenylethyl resorcinol (PR) has been widely used in the personal care industry as a new skin-lightening ingredient. It is a synthetic compound, partly derived from the natural whitening compound in the bark of Scots pine, and is considered a reliable whitening agent.