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Quality of Probiotics and Their Effectiveness
Many over-the-counter probiotics may not have high enough concentrations or bacterial units to make a significant impact and may not colonize the gut effectively. Probiotic-rich foods such as kefir, kombucha, Greek yogurt, live yogurt, sauerkraut, and pickled vegetables are more effective than supplements. While supplements work for rare pediatric gastrointestinal issues and antibiotic-associated diarrhea, their effectiveness is limited.