An isolated novel Lactobacillus paracasei subsp. paracasei K56 is provided. Lactobacillus paracasei subsp. paracasei K56 is used to increase the flavor of a fermented product, a functional product or dairy food and is capable of regulating immunity and inflammation.本發明係關於一種新穎副乾酪乳桿菌副乾酪亞種(Lactobacillus paracasei subsp.paracasei)K56,其十分適合應用於增加醱酵產品、功能性食品或乳製品的風味,並具有調節免疫和發炎症狀的功能。