Nashua Nutrition offers a variety of bariatric products, supplies, vitamins and much more. These bariatric products are designed to help bariatric patients maintain a healthy lifestyle pre- and post-surgery. Thinking about weight loss surgery? Bariatric Advantage Pre-Operative Multivitamins can help build and support healthy nutrient levels to improve immune function, which is important after medical weight loss. Bariatric Fusionâ€™s Meal Replacement incorporates the highest quality protein, fiber, vitamins, and minerals that are essential before and after weight loss surgery.