Don’t take probiotics long-term if you have no gut problems

A review of clinical trials conducted on healthy adults shows that probiotics don’t bring about lasting changes in gut bacteria; once you stop taking them, the gut flora returns to its original state, and there’s no improvement in blood lipid levels either. Separate evidence exists for situations such as antibiotic‑induced diarrhea, but that isn’t covered here.

Roughly 2–5 RMB per day, or 700–1800 RMB per year.

This review concludes that there’s no solid proof that probiotics can produce lasting alterations in gut microbiota or improve lipid profiles in healthy adults. While gut bacteria do shift temporarily while you’re taking probiotics, these changes fade once you discontinue them. The product may seem cost‑effective simply because “gut health” is a broad term that can be applied in many ways, and the daily price per serving is quite low.

The same review also notes a few minor benefits in healthy individuals, such as firmer, better‑textured stools and an increase in Lactobacillus in women’s vaginas. Separate evidence exists for treating antibiotic‑induced diarrhea and for specific strains used for particular conditions; those are not addressed here. This recommendation applies only to healthy people who take probiotics daily as a supplement.

Khalesi S et al. (2019). A review of probiotic supplementation in healthy adults: helpful or hype? Eur J Clin Nutr. https://doi.org/10.1038/s41430-018-0135-9