This nourishing conditioner evenly tones, brightens, and hydrates hair from root to tip, detangling and softening fragile blondes without dragging down the roots like other formulas can. Formulated with patented OLAPLEX Bond Building Technology™ to strengthen bonds for strong, healthy-looking blondes and greys, Nº.5P is clinically proven to smooth, fortify, and reduce brassiness after just one use.