I have used various vitamin C serums, from expensive to cheap. This is the only one that didn't work well for me at all. As soon as I applied it on my face, it looked like I had put oil on it. It doesn't get absorbed no matter how many hours pass. Not to mention that it doesn't do anything beneficial for the skin. Vitamin C is supposed to give vitality and brightness to the skin. After using it every morning for 2 months, I didn't see any change. Whether I used it or not, it was the same. I know it is very cheap for a vitamin C serum, but honestly, it's better to get another one with more money like the ones from LA Roche-Posay or Rilastil because this specific one is a waste of money.