Patricia Wexler M.D. MMPi Skin Regenerating Serum costs so more than I can normally afford to pay for a skin care product, but with a coupon from Bath & Body Works and the recommendation of an acquaintance in New York City who is a patient of Dr. Wexler, I tried this serum. I was disappointed, mostly because after one month of daily use, I really saw no difference in my skin in any way, even when I looked at my skin in a 10x magnifying mirror. I put the serum on only one half of my face (as I've mentioned in my other reviews, I do this so I can have a "control" or way to compare what a product is actually doing to my skin.) and the fine lines were still the same, and my skin didn't look any brighter or younger or fuller. So overall, it's no a product I'd recommend. One other thing to note: there was no expiration date on the container so I called the manufacturer and a customer service rep said that there is a lot number on the container that is a code for when the product was made. She said that the serum I bought was about a month old, but she would not give me an expiration date, which I thought was odd.