About This Item Ester-C with Flavonoids provides a non-acidic, buffered form of vitamin C designed for enhanced absorption and gastrointestinal tolerance. It includes vitamin C metabolites shown to support longer retention in immune cells, along with citrus bioflavonoids to enhance antioxidant activity. This formula is well suited for individuals requiring immune or connective tissue support without the stomach irritation associated with standard ascorbic acid. Ingredients Vitamin C (as calcium ascorbate with vitamin C metabolites [Ester-C]), citrus bioflavonoids, vegetarian capsule (cellulose), ascorbyl palmitate Why We Chose This Many patients need higher doses of vitamin C for immune resilience, oxidative stress, or tissue repair but cannot tolerate acidic forms due to reflux or gastrointestinal sensitivity. Ester-C offers a buffered, stomach-friendly form of vitamin C that remains bioavailable while supporting immune cell uptake and collagen synthesis. We chose this product because it enables consistent, higher-dose vitamin C support in sensitive patients, aligning with our emphasis on tolerability, compliance, and clinically effective antioxidant support.