NOT A CONCELER, A TREATMENT (RX)Treatments take alittle time. I am 54 years old with terrible dark circles under the eyes coupled with I do not get enough sleep . I tried this product faithfully as directed, generous amount and pat it into the skin. In two weeks I see an incredible improvement. I boost the treatment in the day with Dr. Denese FirmaTone RX then finish it off with the new Pro C Illuminating Eye defense cream. I CAN WEAR EYE LINER AGAIN!! Maybe the poor reviews are by those not using the product correctly.