Immune System Health: Zinc, Vitamin C and Vitamin D support a healthy immune system function.Cold & Flu Symptoms: Vitamin C and Zinc may reduce the occurrence and duration of common colds and the severity of common cold & flu symptoms.Mild upper respiratory tract infections: Echinacea may help to reduce the severity of the symptoms associated with mild upper respiratory tract infections.Support During Stress: Vitamin C helps maintain healthy adrenal gland function which supports a healthy stress response in the body.