VetriScience Hairball Bite-Sized Cat ChewsHairball supplement can help prevent and eliminate hairballs by supporting skin health and normal shedding. Veterinarian formulated without mineral oil or herbals, Hairball features omega 3 and 6 fatty acids to help minimize hairball formation by supporting skin hydration, resiliency and healthy shedding. Biotin is needed for healthy skin and normal shedding. Zinc is involved in keratin and collagen production, which are key factors for skin health.