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Essen Nutrition is a major supplier of weight loss and dietetic products, including liquid proteins, salad dressings, sports drinks, and gluten-free products. They offer a range of products, such as ISOSHOT Liquid Protein, ISO Power Whey Protein, and MayoKetchup, that cater to various health needs. The company has an FDA-registered facility in Illinois and is known for its commitment to quality and research and development.