BNIB & 100% authentic. Perricone Md Essential Fx Acyl-Glutathione Deep Crease Serum is a highly-potent serum with a silky, luxurious texture absorbs quickly to smooth even the most stubborn, deep-set lines, wrinkles and creases around the mouth, eyes, lips and forehead, including marionette lines, frown lines, smile lines and nasolabial folds. Over time, these engraved imperfections appear shallower and expression lines appear erased.