This is an incredible brightening serum. With this serum, a little goes a long way. I use 2 pumps for my face and 1 additional pump for my neck. Be sure to wash your hands first before applying! Since I use retinol at night, I only use this only in the morning after I cleanse my face. I switched this with a previous Vitamin C Serum I use and have seen a difference in my skin within one week! It absorbs so nicely into my skin and does not make it feel greasy. My skin looks brighter and feels smoother. I am able to layer my other skincare on top of this serum without pilling. I plan to continue using this serum and buying more when I run out. I recommend giving this product a try!