Immunitone Plus™ is an herbal formula that is designed to support healthy immune system function.* It contains herbs that support normal natural killer (NK) cell activity and the balance of cytokines, which are the regulatory proteins released by immune cells as part of a normal immune system response.* The standardized herbs in this formula contain optimal and consistent amounts of the most active ingredients. Immunitone Plus™ is suitable for long term use and for all age groups.