Probiotics contain different types of microorganisms such as yeast (saccharomyces boulardii) and bacteria (such as lactobacillus, bifidobacterium). Microorganisms are found naturally in the stomach/intestines/vagina. Certain conditions (such as antibiotic use, travel) can change the normal balance of bacteria/yeast. Florastor is used to improve digestion and restore normal microflora.

The interest in regulating the gut microbiome by consuming foods or the microbiome that could improve overall health dates back to the early 1900s. When it was hypothesized that certain types Milk and yogurt may offer health benefits to those who consume them.