The human body is home to billions of bacteria and other microorganisms, including beneficial bacteria. However, the term "probiotics" often refers to supplements or foods containing these beneficial bacteria. Although these exogenous probiotics are not essential for the human body, they can provide the same benefits as the beneficial bacteria naturally residing in the body, such as aiding digestion and defending against harmful bacteria.
In addition to probiotic supplements, yogurt, fermented and non-fermented milk, miso, and some juices and soy drinks contain probiotics. There is growing interest in probiotics among the public and scientists. Some are studying the use of probiotics as supplements to treat or prevent diseases. So far, the research results are encouraging, and their potential uses include:
Some researchers believe that probiotics can also improve the health of normal individuals. For example, a small 2005 Swedish study found that employees who took Lactobacillus supplements were less likely to miss work due to respiratory or gastrointestinal illnesses compared to those who did not take probiotics.