Thank you very much for viewing. This is a listing for Essience's introductory serum. This introductory serum uses over 90% eggshell membrane extract, which is rich in amino acids. The carbonated bubbles and nano-technology help the ingredients of your lotion penetrate deep into the skin. As an introductory serum, it is used before your lotion. It also seems to be effective in improving wrinkles, and I felt the effect immediately, as my skin became radiant the moment I used it. I just received it today as part of a subscription. I am using it in conjunction with other products, so I have some left over. I decided to list it so that someone else can use it while it's still new. Brand new, unused. I opened it for the photos. Contents: 55g I will include a face mask as a bonus for those who purchase immediately.