I got this anti-aging serum for my wife because she was worried about the little fine lines and crows feet that were showing up around her eyes. She has been using it for about a week and there is definitely some difference in the lines by her eyes. They are not completely gone but they are not as deep as they were. My wife has noticed no redness nor has the serum caused any irritation to her skin. The best thing about this anti-aging serum is the bottle it comes in. The dropper for the bottle is actually slightly curved so that it pickup all the serum. It is shaped this way so it reaches the bottom easier. This means my wife can use the whole bottle with little to no waste. I have never seen a dropper like this.