succinic acid has a positive influence on human metabolism and there is no risk of its accumulation in the human body, it has been used in food industries. Succinic acid is an intermediate of the tricarboxylic acid (TCA) cycle and one of the fermentation end-products of anaerobic metabolism. Thus, it is synthesized in almost all microbial, plant and animal cells. Those organisms suitable for the efficient production of succinic acid can be categorized into fungi and bacteria.