## 5 Products Containing Single-Cell Protein (SCP) on the Global Market  
There are numerous products available on the world market that contain edible microorganisms' biomass, produced from single-cell microorganisms. It can be consumed directly or used as a food ingredient. Most of the products that contain biomass are produced by _S. cerevisiae_, _Y. lipoliptava_, _C. utilis_, and _F. venenatum_. Some of the products are presented in Table 3. One of the products using yeast biomass is QuornTM-meat substitute, in which the main ingredient is mycobacteria derived from the fungus _F. venenatum_. This product is marketed as a meat substitute, both as an intermediate product for further processing and as an ingredient in finished dishes. The company's products QuornTM contain a high amount of protein, a low amount of fat, and generate little waste during production [115]. Quorn products represent a unique source of mycobacteria available in today's food market, which has attracted the attention of many researchers. Research is currently being conducted into the potential use of Quorn in breakfast cereals and as a fat substitute in ice cream and yoghurt production [21; 49]. The composition of mycobacteria, extracted from _F. venenatum_, includes high-value protein in the cytoplasm, dietary fiber in the cell walls, and polyunsaturated fatty acids in the cell membranes. Quorn products are distinguished by their low fat content, high biological value of protein comparable to that of skimmed milk, high amounts of fiber, and the presence of micronutrients and B vitamins. Due to the significant amount of fiber, these products can be labelled as a'source of fiber' or 'high fiber products' [116]. Quorn products can play an important role in weight control through their low calorie density and their ability to reduce feelings of hunger, which is important in the prevention of obesity [117]. Formulations containing mycobacteria are often chosen by those seeking alternative sources of plant protein or looking for lower fat products. Mycoproteins, such as those from Quorn, are distinguished by their high nutritional value, high fiber content, and low fat content. They are therefore attractive to those who pay attention to healthy eating habits. Supplements with mycoproteins are available in various forms, such as powders, capsules, or ready-made protein drinks. Their popularity may be due to the growing interest in plant-based, vegetarian and vegan diets, as mycobacteria offer an alternative to traditional animal protein sources. Also, there is a European project, known as INGEEN, which uses the biomasses of selected strains of _Y. lipolytica_ to produce substitutes of products in dairy industry, like Ricotta, Caciotta, and Squacquerone cheeses [118]. Attention to quality and balanced ration feed, taking into account the needs of animals, has led to the development of numerous innovative food additives of diverse composition, one of which is yeast, used for a long time in the nutrition of many groups of livestock. The use of preparations based on yeast contributes to improving the health and overall condition of animals. _S. cerevisiae_ and _Y. lipolytica_ are the main types of yeast used in feed production, which are sources of protein, B vitamins, bio-elements, and enzymes [119]. In 2019, EFSA recognized the biomass of _Y. lipolytica_ as a novel food safe for use in accordance with Regulation (EU) 2015/2283 on dietary supplements. Yeast from this species has found use as an encapsulated dietary supplement with a high protein content. A review of the global market shows that single-cell proteins are finding increasing use in various food products, both in traditional and novel food alternative foods [22].  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline