If you are looking for a natural serum of Vitamin C this one is great because their ingredients are naturally derived. This serum of Instanatural also comes with Hyaluronic Acid, Ferulic Acid, Sea Buckthorn oil and plant stem cells. It is made in USA. It comes in 1fl oz / 30 ml. They changed their presentation. The bottle comes with a pump. It helps to prevent wrinkles, reduce dark circles, and discoloration.