Taking probiotic supplements is often an unnecessary expense because their effectiveness is limited by our current inability to precisely target the necessary strains.

noli's read

This claim is based on the complexity of the human microbiome, which is unique to each individual, making it difficult to predict the response to a specific strain. Meta-analyses, such as those published in 'Genome Biology', confirm that intestinal colonization by ingested probiotics is variable and often transient. It is scientifically accurate that the market is vast and that many products lack robust clinical evidence for generalized health benefits in healthy individuals. However, research—notably randomized controlled trials or RCTs—supports the efficacy of specific strains for targeted disorders, such as certain antibiotic-associated diarrheas or irritable bowel syndrome. The exaggeration here lies in the generalization: while efficacy is not universal, it is not nonexistent either. The field remains in constant evolution, and the scientific consensus emphasizes above all the need for a more personalized approach rather than total ineffectiveness.

the sources

No named source held this one up — that absence is part of the verdict.