I read a lot of other reviewers mentioning this product was recommended to them by their dermatologist. I'm wondering why they don't just use a prescription product then as that is a more potent and effective product. Retinol isn't as effective, but still delivers results. The first time I used this PC product my face was SO RED. It reacted angrily and I felt sunburned. My skin adjusted though and it did look smoother, The problem is, a lot of other PC products I use contain a bit of retinol in it and I felt my face was getting overloaded by it. It got red and angry whenever anytime was applied to it- which is a sign to me I was overdoing it. I use the bottle I have now once every week or so to give my face a break. It packs a punch though and does improve the look of my skin. I would recommend it to anyone looking to improve the look and texture of their skin. The pump is easy to use. However the bottle is opaque and it's hard to tell when you're running out of product. I'm taking off a lippie for that.