Powerful Strength Line Reducing Concentrate, Skincare and Body Formulations – Kiehl’s Since 1851. I love love love this product! It gives you a light tingle so you know its working lol I know , so old fashioned but I still love a good tingle with my treatments. I use it about twice a week at night pretty much all over my face , concentrating on problem areas. I have been using a sample that was given to me for over a month so go into a store near you and ask for one.