Institut Esthederm Intensive Vitamine C. 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. It's been formulated with exclusive technologies and patented active ingredients: VITAMIN C COMPLEX 12% - two forms of vitamin C with complementary actions (PURE VITAMIN C 10% for immediate intracellular release + PRO-VITAMIN C 2% for long-lasting intracellular release) to brighten and smoothen the skin and make dark spots less visible CELLULAR WATER PATENT to optimize skin cell energy and preserve skin's youthfulness - to support beauty over time BENEFITS Makes the skin firm, lumi