Your immune system’s main job is to defend you from pathogens (disease-causing microorganisms). Since pathogens are typically inhaled or swallowed, it makes sense for the immune system to concentrate on your respiratory and digestive tracts. In fact, 70% of the immune system is housed in your gut. It lies beneath the lining of your intestines, ready to spring into action if a pathogen enters your gut, to try to prevent you getting sick.
By contrast, some bacteria have a positive influence on your immune system. A healthy gut microbiome interacts with the intestinal immune system in ways that increase your body’s immune defences. However, a microbiome out of balance, which does not contain high levels of beneficial bacteria, is less likely to help you resist infection, including colds and flu's.
Fortunately, certain strains (types) of probiotic bacteria improve the bacterial balance in your gut, with beneficial flow-on effects for your immune system. Lactobacillus rhamnosus (LGG®), Lactobacillus paracasei (8700:2) and Lactobacillus plantarum (HEAL 9) all stimulate the immune system and improve resistance to infection. In fact, the combination of 8700:2 and HEAL 9 has been shown to reduce the severity and duration of common cold symptoms. If you struggle with frequent colds and flu, strengthening your gut microbiome may help.
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