Dietary Supplement. Supports Immune Health*. With electrolytes natural orange flavor. Vegetarian formula. Vitamin supplement. Free of gluten & wheat. Smart Fact Sundown Naturals® Effervescent Vitamin C is a great tasting way to get your daily dose of vitamin C. Vitamin C is a potent antioxidant and also supports immune health.* Vitamin C is combined with electrolytes which support vital functions in the body and help maintain fluid balance.* No artificial color, flavor or sweetener, preservatives, sugar, starch, milk, lactose, gluten, wheat, ye.