I have at agree with the other reviewer on this product. I've been using it for 2 wks. now, and I like it a lot. I had intended to purchase the EL Idealist, but after trying a sample-I wasn't that impressed. I've been trying out Biotherm products for the past several months and like most of the products I've tried. Biotherm is one of those lines that I think is often overlooked and underated. The Source Therapie can be used under a moisturizer or alone. It leaves my skin smooth, matte, soft and silky. My makeup lasts longer and looks smoother when I'm using this. I'll definitely be repurchasing this.:)