Let me start by saying this product was GREAT for my skin. I woke up looking 15 years younger. But -- after only using the cream for 4-5 days I noticed a very foul odor. I immediately returned the item to Saks and they had no problem replacing it. I opened the next jar and after about 4-5 days the same problem returned. It smells like sour milk/rotten eggs! I returned the product for the last time and received my money back. I've written to Mercier - I hope they can correct whatever the problem is because before the spoilage problem this product was great. I'm curious if anyone else has had the same problem, or was it just a "bad batch."