Institut Esthederm Intensive Vitamine C² Dual Concentrate is a brightening antioxidant booster-serum that stimulates collagen and elastin production. It is the first booster serum that combines 2 forms of vitamin C for quick and long-lasting results, transforming the quality of the skin. This booster serum contains 100% fresh vitamin C formula at the perfect dose your skin needs. With our powerful scientifical technologies, your skin will be radiant, brightened, evened and smooth with less visible dark spots and smoothed fine lines and wrinkles.