Cons of Probiotics

The definition of probiotics is "live microorganisms that when administered in adequate amount confer a health benefit on the host," according to the USprobiotics.org. This definition was created by the Food and Agriculture Organization of the United Nations. Probiotics can be foods, supplements and medicines. And to be called such, six minimum requirements must be met for safety and effectiveness. The "cons" of probiotics are side effects, safety concerns, dosage and effectiveness.

Safety

• Probiotics can contain contaminants. Since probiotics manufacturers get their "live cultures" from all over the world and have different production processes, foreign substances could be metals, pesticides and harmful bacteria.

  According to the National Center for Complementary and Alternative Medicine, you might get an infection from probiotic usage, especially if you have a compromised immune system. Those with chronic conditions, severe underlying disease, and newborns should be cautious with the use of probiotics. Overstimulation of the immune system can happen in some people with unknown results.

  Finally, it is difficult to determine proper dosage for individuals. According to Dr. Mary Ellen Sanders, there is no one dose that can be prescribed because there are so many different strains of friendly bacteria used. This poses an issue for determining a safe dose that will be effective for you.

Effectiveness

• According to Dr. Mary Ellen Sanders, independent analysis of products have shown that probiotics do not necessarily contain the number or the exact strain of live bacteria listed on the label. Sometimes, the bacteria are found dead and will not benefit you, according to the the Bastyr Center for Natural Health. And since there is no regulating agency monitoring or determining how to rate probiotic health claims, you cannot know which claims are legitimate.

  Also, how probiotics are prepared makes an impact on their efficacy. Even the same strain of bacteria can show varied results if preparation has been altered, according to the National Center for Complementary and Alternative Medicine.

Storage

• Since probiotics contain live bacteria, many of them must be refrigerated. How long they are effective is under debate. Women to Women's website suggests that you buy smaller bottles and store them in the refrigerator even if the product does not claim that refrigeration is needed.

  Probiotic foods can be affected by storage temperature, oxygen exposure, salt content, light exposure and more, according to Danisco, an international company.

Side Effects

• Although not dangerous, probiotics can have annoying side effects. Bloating, gas, headaches, constipation and flatulence are some of the common side effects. Acidophilus, in particular, might cause bloating, diarrhea, gas or even a temporary worsening of your symptoms for a while. Until your body gets used to the probiotics, you may notice unique digestive issues or symptoms, but these should taper off with continued usage.