Skin Care Review: Perricone Vitamin C Ester Concentrated Restorative Cream

I have been using the Perricone Vitamin C Ester Concentrated Restorative Cream for about a month, using it once per day. The product contains DMAE which is supposed to make the skin firmer. Unfortunately, this product has no effect. When I first applied it, I had a tigling and heat sensation, but after a few uses this disappeared. Subsequent applications have also shown no effect.