GUHL Color Protection & Care Collection Acai, the Brazilian beauty berry, is one of the most nourishing fruits in the world. Its oil is rich in essential vitamins and anti-oxidants. The 5-in-1 formula with Keratin-PLEX+ Technology provides long-lasting colour intensity, keeps hair shiny, strengthens hair fibres from the root to tips, hydrates air and lends it touchable smoothness. For long-lasting, healthy colour protection for up to 14 weeks. The GUHL Color Protection & Care Collection features a shampoo, conditioner and intensive repair mask.