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Ester-C is a breakthrough patented Vitamin C formula supported with naturally occurring metabolites. Metabolites help enhance the absorption of Vitamin C by your white blood cells, an important part of your immune system.* Ester-C's unique, chemical-free manufacturing process neutralizes pH, making it non-acidic and gentle on the stomach.* In a daily dose, Ester-C?delivers 24-hour immune support...so once a day is all you need.* Added Citrus Bioflavanoids may help your body better absorb and utilize Vitamin C.*