Dove Density Boost Strengthening Conditioner with Vitamin B3 & Zinc and 0% Sulfates. Developed with Dermatologists, this conditioner is designed for thicker, stronger, fuller-hair from root-to-tip. It cares for the source of beautifully growing hair – your scalp. Infused with Vitamins B3 & E, Zinc & Peptides, it nourishes roots and strengthens hair fibers. This strengthening conditioner thickens and strengthens thin hair, protecting it from premature breakage. 75% of women agreed that hair felt thicker (Salon study with 40 women with thin, fine hair, 2023). PETA Approved; Cruelty-Free; Global Animal Test Policy.