Immune Function Zinc and vitamin C support a healthy immune system, helping to maintain a healthy immune response. Cold Symptoms Symptoms of the common cold include blocked or runny nose, dry cough and mucous congestion. Zinc and vitamin C help to reduce the duration and severity of cold symptoms. Support During Stress Vitamin C is important for the adrenals. Healthy adrenal function helps support the body's response to stress. Antioxidant Support Vitamin C provides antioxidant support to help protect against potential free radical damage. This medicine may not be right for you. Follow the directions for use. If symptoms persist, talk to your health professional. Supplements may only be of assistance if dietary intake is inadequate.