Probiotics health claims face scrutiny due to limited scientific evidence

While probiotics are widely marketed for improving gut health and immune defense, scientific evidence supporting many of these health claims remains limited. The concept relies on the idea that introducing beneficial bacteria, such as bifidobacteria or lactobacillus, can alter the gut microbiome to reduce risks of obesity or heart disease.

However, experts warn that the human gut is a complex ecosystem. Epidemiologist Gideon Meyerowitz-Katz compares the practice of taking single-strain probiotic supplements to dropping 10,000 trees of a single species into the Amazon rainforest and expecting the entire ecosystem to improve.

Large-scale, rigorous studies have often failed to show significant benefits. For instance, research into probiotics for preventing the common cold, treating eczema, and aiding premature babies has yielded inconclusive or disappointing results compared to placebos.