Redken Acidic Bonding Concentrate Shampoo for Damaged Hair 33.8 fl. Sulfate-free bonding shampoo provides ultimate strength repair, intense conditioning and hair color fade protection to damaged hair. Redken Acidic Bonding Concentrate Conditioner for Damaged Hair 33.8 fl. Sulfate-free bonding conditioner provides ultimate strength repair, intense conditioning and hair color fade protection to damaged hair. Redken Acidic Perfecting Leave-In Treatment for Damaged Hair. This bonding leave-in conditioner for damaged hair helps to strengthen hair, prevent breakage, and reinforce weakened bonds in the hair. Redken Acidic Bonding Concentrate Intensive Treatment for Damaged 5.1 fl oz. Redken’s most concentrated Bonding Care Complex formula. This pre-shampoo rinse-out treatment provides strength repair in 1 use.