Where else but France, the birthplace of macarons and éclairs, would sugar be the secret to gorgeous skin? Glycans, sugar structures found on the surface of cells, help prevent dark spots from forming at the skin's surface, explains Bruno A. Bernard, L'Oréal Paris' research fellow and head of the Yves Saint Laurent Skinscience committee in Paris. The ingredient is at the core of YSL's new Forever Light Creator, which also incorporates a vitamin-C derivative that Bernard says improves skin's ability to reflect light. "The complexion looks more radiant after just a month," he says, summarizing results of a clinical study conducted by YSL. "After two months, color imperfections look visibly reduced." In addition, the formula can boost circulation, getting blood flowing to lend a youthful blush, explains Wilson. Salicylic acid and cherry-tree extract also slough away dead skin cells to reveal a fresh, bright layer of new skin.