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Immune Health500 mg Per TabletGentle on the StomachVitamin SupplementVitamin C Bonded to Calcium so it's Gentle on the StomachBoosts Antioxidant ActivityPromotes Immune HealthScience-Backed Quality Since 1969For a powerful boost of antioxidant protection that won't upset your stomach Swanson Buffered C with Bioflavonoids is an excellent choice. It features a unique form of vitamin C that's bonded to calcium through a special process that neutralizes the vitamin's acidity making it gentler on the stomach—but that's not all. Each capsule also includes 200 mg of natural citrus bioflavonoids that promote efficient assimilation of vitamin C and enhance its antioxidant potency.