Acid bond concentration Redken Focus 24 hours a day, day and night, fight daily and strengthen damaged hair for repair 24/7. This repair serum is formulated with citric acid, which penetrates 7 layers deep and strengthens hair from within* and polyglulamic acid + squalane, for intense long-lasting hydration. Combats daily damage overnight, hydrates and softens, reducing blemishes and reducing breakage. Its lavender fragrance promotes a sensory experience with a relaxing effect at bedtime. Benefits: | Repairs, strengthens and protects hair from everyday aggressors like pollution, humidity or heat tools that cause breakage and split ends.