Pillar Performance Tropical Ultra Immune C Support delivers a high-strength dose of vitamin C (1000 mg) with vitamin D3 (1000 IU) and zinc, the Ultra Immune C provides direct and immediate support to the immune system to reduce the duration and severity of symptoms associated with the common cold. It helps to address the specific immunity challenges associated with run-down athletes, as well as those struck down with illness during the colder, winter months. This powerful combination of immunity-boosting micros is delivered in a light powder with a delicious tropical twist, keeping your immune system firing in even the toughest conditions.