I have been using a vitamin C serum for years. I have used so many types of serums to improve my skin. I am really impressed with this Dr. Whitney Bowe Asta C™ vitamin C serum. First off it goes on to me more like a lotion than a serum. The texture is really lovely and it creamier than a typical serum. I really appreciate that it is easy to apply and that the product does not drip like a true serum can. I have found that it absorbs perfectly and leaves my skin smoother with a definite improvement in my texture. It is firming which most vitamin c serums can’t do. This one brightens as well. I feel that a few of my darker spots have faded. I also really appreciate that this product comes in a refillable container. Sustainablity in beauty is important to me. I will definitely be switching from my former vitamin C product to this