Bioderma Nodé K Keratoreducing. Prevent unpleasant itching, irritation, and unsightly flaking of the scalp with the Bioderma Nodé K Keratoreducing conditioner! What benefits does the Bioderma conditioner offer? It regenerates and nourishes the scalp and hair, combats dandruff, makes combing and detangling easier, provides hydration, and protects the hair, leaving it healthy and shiny.