It is a serum / lotion Phenylethyl Resorcinol . Phenylethyl Resorcinol (eq. Sym-White™ ) 0.5% Ethyl Ascorbic acid ( Vitamin C Ethyl Ether ) 3% 4MSK (Potassium Methoxysalicylate) 2% MSH White™ ( Undecylenoyl phenylalanine ) 2% Phytosphingosine 0.1% PalGLY (Palmitoyl Glycine) 1% Ectoine ( Ectoin , fr...