The Redken ACIDIC GROW FULL SYSTEM DUO SHAMPOO AND CONDITIONER is a jumbo-sized set designed for color-treated and damaged hair. With biotin as the active ingredient, this shampoo and conditioner duo from the Redken Extreme product line nourishes and repairs hair, promoting healthy growth. Ideal for both men and women, this product provides a deep cleansing and revitalizing experience for your hair, with a 12-month period after opening for optimal use.