Fermented products, such as kefir and miso, have been used therapeutically for 10,000 years or more. In the early 1900s, Russian scientist Elie Metchnikoff theorized friendly bacteria in yogurt enhanced physical and mental health and prevented aging.
As scientists have further uncovered the role of the human microbiome in health, and the development of various diseases in the past few decades, probiotics have become a hot health trend once again. Not all probiotics are created equally. There are many different strains of beneficial bacteria and yeasts, and they’re not universally effective for all conditions. Find out which popular claims about probiotics are supported by evidence, and discover how to find the best probiotic supplement for your needs.