Probiotics are naturally occurring "good" or "healthy" bacteria that work within the immune system and especially in the digestive system (where 70% of the immune system is located) to keep the body in a balanced state. Probiotics are generally food products containing the healthy bacteria that can both replace bacteria that has been lost through the use of antibiotics (which by nature destroy all bacteria in the body), and also act as a preventative measure in strengthening the immune system to resist illness.
There are over 100,000 billion viable bacteria in your digestive system made up of some 400 different kinds. Maintaining a proper balance between "friendly" bacteria and harmful bacteria is important to good health. With the explosive use of antibiotics today, many people may experience unexpected side effects as the good bacteria are destroyed along with disease-causing bacteria. In addition to decreased digestive function, you may also experience gas, bloating, toxicity or bad breath. This also leaves the system vulnerable to an overgrowth of Candida.
Everyone needs these helpful bacteria. Acidophilus helps synthesize important vitamins, nutrients and enzymes. Acidophilus works to break down food in the small intestine, and leads to the production of lactic acid, hydrogen peroxide, as well as other products that help suppress detrimental organisms. Acidophilus also helps produce lactase, an enzyme that breaks down milk sugar into simple sugars. This may aid individuals with lactose intolerance.