For oily dandruff flakes with itchiness and redness also use Willow Bark SPECIAL SHAMPOO. With valuable active ingredients from willow bark and thyme. How to use: Depending on the length of hair, put about a hazelnut-sized amount of shampoo into your hand and dilute with water. Spread onto dampened hair and gently massage. Rinse well. Repeat if necessary. High yield: for 30-45 applications.