Nioxin Density Defent Diaboost Hair Thickening Serum Treatment for Strengthening Hair Volume & Protection from Hair Breakage. This advanced serum is proven to instantly boost hair diameter and protect hair from breakage, allowing it to grow. The advanced formula is specially designed to enhance hair thickness and density, giving you fuller hair. No, it not only thickens your hair but also strengthens it - nourishing it from within, leaving it more manageable. With powerful ingredients such as: Caffeine: Stimulates hair follicles, improves blood circulation and maintains the skin barrier. Peppermint Leaf Oil: Also known as peppermint oil, this oil is known for its revitalizing and tonic benefits that stimulate the scalp and promote circulation. Peppermint Oil: May help regulate sebum production and control oiliness. Niacinamide: A form of vitamin B3, niacinamide helps nourish the hair root and can have a positive impact on hair growth and overall scalp health.