Phenylethyl Resorcinol ek powerful ingredient hai jo melanin production ko kam karta hai. Isse dark spots, hyperpigmentation aur uneven skin tone fade hone mein madad milti hai. Ye resorcinol-derivative tyrosinase inhibitor hai jo kaam karta hai, lekin iska formulation careful hona chahiye kyunki ye thoda unstable aur sensitive hota hai.