Probiotics are microorganisms, such as bacteria and yeast, found naturally in the intestines, according to WebMD. The human intestinal tract contains more than 500 types of bacteria that help digest food. The American Ga... More »

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The best probiotics in supplement form contain at least 20 billion bacteria, according to WebMD. However, nutritionists prefer getting probiotics from natural food sources such as yogurt and kefir whenever possible. More »

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Probiotics are used to support or improve a variety of health conditions, but WebMD reports concerns about probiotics being regulated as a food rather than a drug. As of 2014, uncertainty remains as to possible complicat... More »

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HowStuffWorks notes that probiotics work because they recolonize the stomach with healthy bacteria, which are usually eliminated by antibiotics. Scientists are convinced that probiotics fight toxins and pathogens. Probio... More »

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Lactobacillus acidophilus is a form of bacteria that occurs naturally in the body in areas such as the mouth, vagina and intestines, according to Mayo Clinic. Although it lacks the ability to produce other vitamins and a... More »

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Acidophilus is a species of helpful bacteria that is found in the intestines and vagina, explains Drugs.com. It is sometimes used to help treat yeast infections and diarrhea from antibiotics, and it is thought to work by... More »

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Milk provides an environment that is particularly favorable for the growth of microorganisms, resulting in the rapid growth of mold, yeast and bacteria. Milk that is freshly drawn is around 38 degrees Celsius and needs t... More »