Probiotics, or "good" bacteria akin to those in the human digestive system, which can be found in products such as supplement pills, yogurts and cereals, are generally safe and can boost health in some cases, researchers say. Also beneficial are prebiotics, which have fiber and other nutrients that feed probiotic bacteria. More than 150 probiotic and prebiotic commercial food products are now available in the market, displaying significant growth in the sector, according to a market-research firm.

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