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REDKEN Acidic Bonding Concentrate leave-in restorative serum works around the clock to strengthen hair and protect it from daily damage. Citric acid penetrates deep into the hair fiber, helping to reinforce the hair’s internal bonds, while polyglutamic acid and squalane provide long-lasting hydration, smooth the hair surface, and reduce frizz. In addition, it helps maintain the vibrancy of color-treated hair, adds shine, and protects hair from everyday environmental stressors. The lightweight formula does not weigh hair down and is suitable for all types of damaged hair, including color-treated hair. Vegan formula.