I was looking for an intense serum and after doing some research I tried this one, Clarins Double Serum, and boy am I glad that I did! It claims to revitalize skin with age-defying results. This serum has helped reduce the size of my pores, brighten my skin, and has helped with fine lines. It's a bit pricey but I think it is well worth with investment. One 30ml bottle lasts 6-8 weeks if used according to the instructions.