Sauerkraut contains lactic acid bacteria (lactobacillus), which are known as probiotics because they help maintain good digestion by producing digestive enzymes such as lactase (lactic acid) during fermentation process. This enzyme helps break down lactose into simple sugars like glucose, galactose, fructose etc. , which are absorbed by our body easily without any side effects. Lactobacillus also help maintain healthy immune system by suppressing harmful bacteria growth.