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L'ANZA ADVANCED HEALING VOLUME Thickening Shampoo is a daily, sulfate-free shampoo that removes excess oil that weighs down hair. Free of sulfates, parabens, gluten and sodium chloride. Increases the diameter of each hair fiber from within, so hair becomes thicker. Contains Organic Bamboo Extract. Bamboo is the world’s richest resource of natural silica – a lightweight mineral vital to creating volume in hair. The Organic Bamboo works from inside the hair fiber by utilizing Nano Science 10² to deliver Bamboo’s abundant silica deep into the cortex. This lightweight silica bonds to the hair’s cortical wall, boosting rigidity and volume. The result is noticeably thicker, fuller hair.