I've been on the hunt for a retinoid serum to combat some fine lines I have on my forehead. I heard so many great things about The Ordinary, but their price point was what truly drew me to the company. I didn't have high expectations for this product, but it has completely changed my skin in ways I never thought possible. My fine lines have significantly diminished, along with my skin becoming baby soft, even toned and my pores shrank to the smallest they've ever been in my life. One warning to anyone starting to use this: if you have acne on regular occasions like I do you will breakout when you first begin to use this! That is your skin purging! My skin freaked out for about 3-4 days, than my skin settled. If you do keep breaking out this product may not agree with your skin. I've barely had a breakout since, which I was not expecting at all, but I'm beyond thrilled. Also, for me personally I started to use this every other night because retinoids/retinol in the past have been harsh on my skin and made me peel/flake, even when I would only incorporate using it in my routine a couple days a week. I can use this serum everyday and I have no irritation from it at all. I cannot say enough good things about this product. I will continue to buy this and I hope it exists forever! If you're looking to start using a retinoid try this one. It's only $9.80 and it works!