I was using the whole Arcona product line, and I never received more compliments on my skin than I have my whole life. This product makes my skin glow like nothing else. I followed the instructions at first, and used it about every other night. My skin would be ultra dewy in the morning, radiant and clear. If I wanted my skin to glow throughout the day, I would add just a touch to my morning moisturizer, and my skin would glow through my makeup. However, after using this for a little over a month, my skin got really irritated. I was using all of Arcona's products and nothing else. I think the lactic acid was too much for my skin. Even when I stopped using some of the products ,my skin never really recovered until I switched product lines. I had to put extra makeup on to cover up the redness (and I don't like wearing makeup). But, this is the 1 Arcona product I would definitely re-buy.