Solid-state fermentation is a method of culturing useful microorganisms on solid substrates (grains, fruits and vegetables, plants, agricultural and livestock by-products, livestock manure, industrial waste, etc.) containing low moisture, proliferating it from the substrate surface to the inside, thereby producing effective target substances.

By using a substrate with low moisture, the possibility of contamination is reduced, and a large amount can be cultured at one time. In addition, there is an advantage in terms of yield and productivity as it extracts the target substance with a small amount of a solvent during the extraction. Solid-state fermentation is an environmentally-friendly method that produces less wastewater while saving energy.

Korean traditional foods (soybean paste, soy sauce, kimchi, salted fish, etc.) are produced based on solid-state fermentation. Although useful microorganisms fermented from these traditional foods (foods produced from solid-state fermentation) are used in various ways in the food industry, solid-state fermentation methods are rarely used in the current cosmetics market. The Garden of Naturalsolution Co., Ltd. uses the solid-state fermentation method to manufacture raw materials and uses them in cosmetics, which furthermore has potential to be widely used in food and waste treatment.