My two favorite retinols are on sale for 15% off using code SkinC15. Once you hit your late 20's you should really start investing in a good retinol. If I knew then what I know now about skin care I would've started using retinol earlier but I'm here to tell y'all start now. Retinol is a good exfoliant and it helps prevent aging by decreasing the appearance of fine lines/pores, etc. It's always better to prevent aging than trying to reverse it. These are my two favorites. Start with a the lowest dosage and work your way up as your skins tolerance builds. LTKBeauty LTKFallSale