Powercell Repair with Lactic Acid is a single-dose repairing treatment for very damaged hair. To be used after shampooing as an instant repairing treatment for fragile, brittle, sensitised and devitalised, lifeless hair.Provides complete renewal and intense strength for chemically-damaged hair.L"Oreal Serie Expert Treatments target the cortex (Zone C) to neutralize weak, negatively-charged keratin bonds that have been broken down by a chemical process.The hair"s internal structure is reinforced with reduced porosity, optimizing a color or smoothing process for radiant shine and long-lasting protection of color.Lactic Acid is able to create saline bonds between the keratin chains exposed in the cortex of damaged hair fibres. AS if transformed, hair is left soft, supple, with a natural-looking shine.