Although a bit pricy, I have read up on ... [SEP] Although a bit pricy, I have read up on the retinol and everything seems to be very positive.  This is a very small bottle, but a little goes a long way. The serum is a bit sticky when first applied, but as it dries the tacky feeling goes away.  I just stared using it on my eye and upper lip area.  I am not expecting it to work overnight, but I am hopeful to see some changes.  I did however use it on my neck and I really did think that it tighened my skin a bit. I was given a discount for this review and I can say that I will continue to use this especially on my neck area.