Brand from Japan: Rohto Mentholatum. This serum is a unique formula from Obagi, formulated with pure vitamin C and vitamin E.Now includes Advanced C Control.The highly penetrating formula has been improved.It moisturizes the dead skin cells and addresses various skin concerns, including texture, roughness, and pores, from multiple angles, leaving skin smooth, radiant, and stunningly clear.Particularly for those who are starting to worry about pores.How to use:Twice a day, morning and night, after cleansing and toning, dispense 3-4 drops of Obagi C or 4-5 drops of C25 into the palm of your hand and smooth over your entire face.If dry skin is a concern, follow with your regular lotion or cream.