Principle Healthcare Vitamin-C Effervescent Tablets: Immune Boosting Vitamin C in a Refreshing Drink. ‣ Provides 1000mg of Vitamin C per tablet. ‣ Supports immune health. ‣ Effervescent form for quick absorption. SUGGESTED USE: Dissolve one tablet in a glass of water daily, or as directed by your healthcare provider. INGREDIENTS: Vitamin C, Citric Acid, Sodium Bicarbonate, Natural Flavors, Sweeteners.