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Content: But unless the bacteria are scientifically proven to have a beneficial effect they're not truly probiotic. For example, yogurt is made by adding the lactic acid producing bacteria Lactobacillus bulgaricus and streptococcus thermophilus to milk. But they're not recognized as probiotic cultures because they don't reach the intestinal tract alive. That's why, yogurt brands have to add probiotic strains to qualify as a probiotic food. Should You Be Taking Probiotics? Scientific research into the health benefits of probiotics is still growing. However, a considerable amount of research suggests probiotic cultures may benefit a whole host of digestive issues, skin and inflammatory conditions as well as immune function support and emotional well-being (1). The beneficial bacterialiving in the lower digestive tract provide a protective barrier against disease causing bacteria, pathogens, parasites and yeast infections. While there is evidence that probiotics do help to improve digestion and gastronomic health, it is hard to say that one brand over another is more effective at doing so. Go-Ask-Alice  Columbia university 
However, the balance between good and bad is fragile one easily eroded by poor diet, stress, antibiotics, laxatives, antacids and a lack of exercise.