Koh says the low strength in this retinol is great for beginners. Best with pure retinol: SkinCeuticals Retinol 0.5 Retinol 0.5 Retinol 0.5 $90.00 at Dermstore Retinol 0.5 $90.00 at Skinceuticals ...

retinol can be very drying and you won’t know how your skin will react at first. This formula from Skinceuticals has a a low-but-still-effective concentration of 0.3 percent and is a good place ...