Immune system. Helps support the immune system. Cooling flavor meter. Food choice for diabetes (Based on Choose Your Foods: Food Lists for Diabetes, Academy of Nutrition and Dietetics): 1 Free food choice per 2 drop serving. Assorted Citrus Halls Defense Sugar Free Vitamin C Supplement Drops are available in the following flavors: Lemon, Pink Grapefruit and Orange. Assortment in each package may vary.