“formulas as easy as possible, I’ve simplified my recommendation to just five core probiotic species that are widely available: Lactobacillus plantarum, Lactobacillus acidophilus, Lactobacillus brevis, Bifidobacterium lactis, and Bifidobacterium longum. Different strains provide different benefits, but these are the ones that will, as we’ve been discussing since the beginning of the book, best support brain health in these ways: • Fortifying the intestinal lining and reducing gut permeability • Reducing LPS, the inflammatory molecule that can be dangerous if it reaches the bloodstream • Increasing BDNF, the brain’s growth hormone • Sustaining an overall balance to crowd out any”