I bought a new brand of Probiotics yesterday (the one I was taking was ghastly expensive) Called Jarro-Dophilus +FOS. The bottle proclaims High Potentcy 6 species survives stomach acid and colonizes the intestines. FOS are natural carbohydrates that enhace replication of benificial bacteria. Should I be worried about taking it. Somehow the idea of microorganisms colonizing my intestines freak me out.