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Bariatric Advantage Vitamins & Essential Nutrition Supplements for Weight Loss Surgery -- Science-Based. Patient-Focused. Bariatric Advantage Nutritional Supplements give you the advantage! Nutritional Supplements for Bariatric Surgery Patients. Bariatric Advantage provides a complete line of dietary supplements that have been specifically formulated to meet the unique nutritional demands of both the pre-operative bariatric surgical candidate, as well as the post-operative bariatric surgical patient.