Phenylethyl resorcinol (commonly known as "377") is a synthetic ingredient widely used in skin care products. Its main effects include inhibiting melanin production, fading spots, and brightening skin tone. It also has antioxidant and anti-glycation effects. Its mechanism of action is to inhibit tyrosinase activity and reduce melanin synthesis, thereby improving skin dullness, acne marks, chloasma and other problems. It is also highly stable and relatively friendly to sensitive skin.
