It should be mentioned that not only food manufacturers, but also the pharmaceutical industry has become interested in this field. In consequence of this has led to the so-called grey area which describes the overlapping of the interest of food and pharmaceutical industries. This latter is represented by several companies such as Novartis Consumer Health, Glaxo SmithKline, Johnson& Joghnson or Abbott Laboratories. One important motivation for such companies to invest in functional food is the shorter development times and lower product development costs compared to pharmaceutical products. In addition, these companies have intensive experience in organizing clinical trials to substantiate health claims of a specific product. Against the above-mentioned, pharmaceutical companies generally failed to gain foothold in the functional food market due to the incompetence of developing and marketing a high-quality food product.