I've not been using this a week, and the heavy dark circles I had under my eyes are gone.
I don't know what was causing them, maybe age.. I'm 54 and fair skinned. But these dark circles wouldn't go away no matter how much sleep or vacation.
After the very first application, I could feel a tiny sting, nothing painful. Just a notification that it was doing something. I 'd be very careful NOT to get this in yur eyes.
Not sure what the magic ingredient is, but the dark circles are not concealed, they are gone! I will continue using this for those "craters" under my eyes, hopefully can see some improvement over time.
Also, I really like the applicator "pen". You can get the product right where u want it, and not get yur pinky involved. A lot less stretching of the skin around your eye, which I understand is very sensitive skin.
Highly recommend this stuff!