Sunday Riley - Containing ultra-pure, formaldehyde-free glycolic acid to help revitalize the appearance of dull, sun-damaged skin, Good Genes Glycolic Acid Treatment from Sunday Riley is an essential addition to your skincare routine. Infused with fermented prickly pear extract - to soothe and calm the complexion - along with skin-purifying lemongrass extract, this wonder-serum will help you achieve radiant results.