The body is a complex collection of billions of organisms, each of whom must be healthy for the body’s overall health. Where vitamin and mineral supplements help reinforce the structures of the body, probiotic supplements help keep a healthy level of microorganisms within the body. One of the benefits of these microorganisms is the health of the immune function. The following three probiotics are found naturally in the body and have been used in foods for thousands of years. The “L” in each name stands for lactobacillus, meaning that they produce lactic acid as their byproduct. This is the acid responsible for the tartness of yogurt and pickles.