Redken’s Acidic Bonding Concentrate 24/7 Night & Day Serum delivers visible bond repair overnight and consistent strengthening throughout the day with a 7% bonding care complex designed to rebuild and fortify weakened strands. With regular use, hair breaks less, feels more resilient, and looks smoother and healthier, making it especially suited for color-treated and bleached hair. Citric acid and polyglutamic acid help support cuticle integrity, while squalane, squalene, and dimethicone provide lasting hydration, frizz control, and a glossy, polished finish without weighing hair down. Used day or night, it boosts manageability and surface smoothness while maintaining hydration and resilience, and it comes in packaging made with 94% recycled plastic.