What is it? Redken Acidic Perfecting Concentrate Leave-In Conditioner is our most concentrated all-in-one formula for strength repair for all types of damaged hair. This conditioning leave-in treatment provides ultimate strength repair, intense conditioning and hair color fade protection. Featuring Citric Acid, this leave-in conditioner contains a concentrated bonding care complex that reinforces weakened bonds within your hair to improve hair strength. This leave-in conditioner repairs strength in damaged hair, provides heat protection up to 450 degrees, tames frizz, adds shine and reduces hair breakage. This pH-balancing leave-in conditioner is specifically formulated with an acidic pH to defend against the negative effect of hair coloring, styling tools, and even water. The result? Hair that looks and feels healthy.