I agree with the other two ladies: retinol, and only at night. BUT... you need to monitor its effect on you. I used retinol (Philosophy Help Me); the first few months, I was in love: smoother skin, pores seemed smaller, signs of age on my chest smoothed out. Then, disaster: my skin got really dry (I'm normally oily), my face got red, my pores looked enormous. I went to a dermatologist, and the esthetician there told me I had rosacea, and the products I was using were too harsh for me. She put me on a simple regimen, which included a day cream with SPF 50 and a night cream with peptides (Revisionist); within 48 hours, my skin calmed down, smoothed out, and looks awesome! I'm 46, by the way, and most people think I'm in my mid-30's.