Est. 1973 Immune System Dietary Supplement Lab Verified Nutrition A Brighter Way Since 1973, we've scoured the globe for the highest quality ingredients, connecting you with the most efficacious supplements that help you live brighter and embrace the moments that matter most. Vitamin C is a powerful antioxidant and is intended to support a healthy immune system. Calcium has been added to buffer the natural acidity of Vitamin C.