three times a week, evening.Apply at night on alternate days. Use 1 vial each week. Divide the contents of the vial into 3 weekly applications. With dry hair, apply 1/3 of the contents of the vial using the applicator separating the hair and drawing lines on the scalp. Gently massage the scalp in circles with the yolk of the fingers for easy distribution and absorption. Continue the massage until the solution is completely absorbed. Leave on overnight. Do not use the hairdryer or rinse. The next morning, wash the hair with tricology shampoo to enhance the results and lighten.