Nioxin System 1 Scalp + Hair Thickening Conditioner 1 LitreSupport your hairs strength and thickness with Nioxin System 1 Conditioner, designed specifically for natural, untreated hair showing early signs of thinning. Clinically and dermatologically tested, this conditioner improves hair texture and strengthens strands from the root to reduce breakage and promote fuller looking hair. Infused with niacinamide, biotin, and caffeine, the formula helps stimulate hair follicles, nourish the scalp, and enhance