Who knew that manna was primarily carbohydrates? Well, it is if it comes from Mannatech. The multi-level marketing company (one of the largest after Alticor's Amway and Herbalife) develops and sells nutritional supplements. Many of its products include Ambrotose, a proprietary blend of monosaccharides (simple sugars) that is claimed to promote cell-to-cell communication. Its vitamins, weight management products, and skin care items are distributed through a network of more than 500,000 independent salespeople. The company does not maintain its own manufacturing facilities and instead relies upon third-party manufacturers in the US.