The Bio Cellular Bio Concentrate Serum is a great product. Quite pricey (even in Switzerland, which is where I got mine). A pharmacist sold me this as a 'light moisturizer' and on a normal or oily skin, it would work fine just as is (especially in summer). It is a light gel-like liqud that goes on smoothly and is absorbed super fast. Feels a bit sticky for the first couple minutes, but then disappears. Smells divine too. I notice that within a week of regular use my skin felt nice and soft. I have also used it under my creme de la mer in Winter and at night. My bottle just ran out and the only reason I am not replacing immediately is because I have fallen for the La Mer Serum. From memory, Bio Cellular runs around US$80-$100 for 1oz (30ml).