Probiotics are positive bacteria that move into the gut microbiome and colonize it into a more healthy state. They are found naturally in fermented foods like yogurt, cheese, and kombucha, but are also found in explicit probiotic supplements.
By colonizing the gut microbiome probiotics help primarily with digestive issues. Smaller things like indigestion, bloating, upset stomachs, and constipation are fairly easily resolved. Although even larger issues like diarrhea, infections, and symptoms of greater illnesses can be alleviated by promoting a healthier gut.
This is especially important when considering the reasons for a poor gut microbiome. Factors like artificial foods, sugar, a lack of activity, and a lack of sunlight lead to a weak gut. These are lifestyle forces that can take a lot of will and effort to change, and probiotics are a quicker and easier alternative to these changes.
Infographic Source: https://dailynouri.com/pages/why-probiotics-are-necessary