There are many probiotic supplements available on the market but not all of them are as effective as others. The best probiotic supplement will be one from multiple bacterial sources since it has been proven that the multifaceted approach has a much greater effect not only in raising beneficial bacteria but helping the intestines to produce these essential compounds on its own, that is what we focused on at Phoenix Nutritionals. A good probiotic will provide a minimum of seven strains of interconnected bacteria.