I am in the "beauty" business and have known and used this product for ten years. I have gifted it to many others and although I have access to high end, medi grade skin products - this "one & done" provides results - if you use this during the day and retinol at night - you have a very simple easy and efficacious routine. My favorite memory is when I first used this - I wrote to Kelli and she replied! Her story is terrific and I continue to expand what I purchase and gift from Swell Skin. Just try one bottle- you too will be "hooked". Make sure you apply this to cleansed skin - dont forget your neck and decollete!! I look forward to the frequent buyer plan or subscription service for the loyalists!