vitamin c serum with a slightly thick texture takes a little time to be absorbed [SEP] i am always interested in trying new skincare innovations products and brands i am new to this american brand md complete but found the vitamin c serum nicely packaged and high qualityi use different serums in the morning and at night this vitamin c is a little thicker than what i usually use and is feels a bit oily but going on it is absorbed quickly and does not leave the skin feeling greasy i would use it at night though it felt deeply hydrating and the vitamin c helps brighten and even out skin tonei have sensitive skin but did not experience any irritation sensitivity or redness using this product