Glow Tonic Serum This lightweight serum gently exfoliates, hydrates & nourishes by penetrating deeper layers of the skin for quicker, more noticeable results. This potent formula softens, refines and restores radiance for smooth & balanced skin. As the product designed to hydrate and nourish your skin in our expanded line of Glow Tonic products, Pixi Beauty Glow Tonic Serum is the third step in a brilliant skincare routine. This lightweight serum infuses your skin with beneficial nutrients while setting the stage for the final phase of your daily routine. A little serum goes a long way, with only a few drops of the powerful formula needed to achieve a balanced and radiant complexion.