Extra-strength Vitamin C with bioflavonoids, to get you through cold and flu season, and the allergy months. Ester-C is made from calcium ascorbate formulated through a patented process so that it neutralizes intestinal acids and can therefore be absorbed without discomfort. It also contains a form of calcium, which enhances absorption. SISU Ester C is made with quercetin, rather than citrus-source bioflavonoids, which makes this the ideal immune support for individuals who cannot tolerate citrus.
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