Swanson Buffered C with Bioflavonoids is the perfect choice for those looking to boost their antioxidant protection without upsetting their stomach. This special form of vitamin C is bonded to calcium through a special process that neutralizes the vitamin's acidity, making it gentler on the stomach. Each tablet also includes 200 mg of citrus bioflavonoids that promote efficient assimilation of vitamin C and enhance its antioxidant potency.