Alto Defense Serum™ is a breakthrough antioxidant serum that achieves 360-degree skin support against environmental stressors in all compartments of the skin, all in a proprietary and uniquely elegant formulation. Alto Defense Serum™ was designed to achieve the broadest range of antioxidant protection from oxidative stress. The product features WEL by skinbetter science®, our proprietary technology, deploying a combination of 19 powerful antioxidant ingredients designed to work together to provide a new level of comprehensive and dynamic defense against free radicals.