Back to all ingredients Lactobacillus paracaesis (L. casei 431) Probiotic Strain A hearty species of lactic acid bacteria often used in the fermentation of foods and is found in the human intestinal tract and mouth. Supports health of the upper respiratory system.† Symbiotic relationship with other beneficial Bifidobacteria and Lactobacilli in the gut.† Helps maintain healthy gut barrier function and innate immune response.† Supports healthy digestive function.† Previous Next