I love this serum and I already use a number of excellent serums.  The serum is thicker than most, which allows the ginseng, ceramides and ginkgo  to penetrate.  On hot nights I even use it by itself as a moisturizer.  My only problem is with the artificial color.  I was hoping the color was from chamazuline from chamomile. but alas it is artificial ,CI 42090 (Blue 1)...