A-Cute Derm's Ultra 20 Advanced Rejuvenating Lotion is the most advanced home maintenance glycolic acid available. The 20% concentration of glycolic acid stimulates collagen production and hyaluronic acid production in the skin. Ultra 20 Advanced Rejuvenating Lotion helps protect against visible signs of dry skin, wrinkles, sun damage, and aging. It improves the overall tone and texture of the skin while it lightens minor skin discolorations. A-Cute Derm's Advanced Ultra 20 Lotion can also be used on thickened skin, especially the hands, feet, elbows, and knees.