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