Try Bio-K+ (bio-K plus)brand of probiotics and probiotic dairy culture, or yoghurt. Available in most nutritional food stores in many states. This product is excellent but a little bit on the expensive side. Each tiny milk culture bottle has 50 BILLION Acidophilus etc..
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Another super product is "Primal Defense" It is an amazingly wonderful product, also available in most nutritional food stores in many states.