Combat daily damage overnight with the 1st bonding serum for 24/7 repair. Citric acid penetrates 7 layers deep and strengthens hair* polyglutamic acid with high leave-in concentration magnetizes to hair for long-lasting protection & repair. This overnight bonding serum works around the clock to repair hair 24/7. For clients with processed, damaged hair looking to strengthen hair and repair daily damage overnight.How to useApply Redken Acidic Bonding Concentrate 24/7 Night & Day Serum to clean, damp or dry hair. For night use, apply generously midlengths to ends for overnight repair. For day use, apply as needed for frizz reduction, conditioning, and shine. Do not rinse.