Must invest!
It should be apart of your skin care regiment.  It makes a difference in my skin when I use it a night. It makes my face look more brighter and youthful looking. The only reason why I'm giving it 4 stars is due to the size. I use about 2-3 pumps and put it all over my face, neck, and upper chest area. It gives me a smooth appearance and use it nightly. I have combination skin so it does make my face dry due to the retinol, however a simple mostrizer will cure the problem. Give it a try this may be for you like it's for me this is my first serum ever as well.
Rating: 4 stars