The intestines are not only a digestive organ but also one of the main centers of the immune system. It is estimated that about 70% of immune cells are located in the gastrointestinal tract. The intestinal microflora plays a major role in modulating the body’s immune response, helping to identify and neutralize pathogens.

A healthy gut microbiota supports antibody production, stimulates immune cells, and prevents the excessive growth of harmful bacteria. Disruptions in its composition—caused by antibiotics, stress, or poor diet—can lead to weakened immunity and increased susceptibility to infections.

Probiotics – what are they and how do they work?

Probiotics are live microorganisms that, when administered in adequate amounts, provide health benefits. They are most often lactic acid bacteria such as Lactobacillus and Bifidobacterium, as well as the yeast Saccharomyces boulardii.

The action of probiotics includes:
– Restoring and maintaining a healthy intestinal microflora;
– Producing antibacterial and antiviral substances;
– Stimulating antibody production;
– Modulating the body’s inflammatory responses;
– Supporting the intestinal barrier, which prevents pathogens from entering the bloodstream.

Probiotics and immunity – why do they work?

Scientific studies confirm that regular probiotic intake can strengthen the immune system. People taking probiotics are less likely to develop respiratory and intestinal infections and experience milder symptoms when ill. Strains such as Lactobacillus rhamnosus GG and Bifidobacterium lactis have been shown to reduce the risk of colds and flu in both children and adults.

Additionally, probiotics may help reduce inflammation and support the body during periods of increased stress, which often weakens immunity.

Probiotics may also regulate immune system activity through cytokine modulation—proteins responsible for communication between immune cells. They help maintain balance between pro-inflammatory and anti-inflammatory responses, which is important for preventing autoimmune diseases and chronic inflammation.

Furthermore, some probiotics support the production of short-chain fatty acids (SCFAs), such as butyrate, which improve intestinal cell function and strengthen the gut barrier. A reinforced intestinal barrier reduces the risk of toxins and pathogens entering the bloodstream, further supporting immunity.

Studies also suggest that probiotics may help lower the risk of allergies by regulating the immune system’s response to allergens and promoting immune tolerance.

Narine and immunity

A particularly interesting strain in the context of immunity is Lactobacillus acidophilus n.v. Er 317/402 Narine, found in Narex probiotic products. Research indicates that this strain has strong immunomodulatory properties, supporting gut microbiota balance and enhancing the activity of immune cells such as macrophages and T-lymphocytes. Its use may also help reduce inflammation and limit pathogen growth, making it a valuable aid for the immune system—especially during periods of increased vulnerability to infections.

Summary

Probiotics play an important role in maintaining a healthy gut microbiota and supporting the immune system. Regular consumption may reduce infection risk, ease disease progression, and improve overall health. Including them in your daily diet is a natural way to strengthen the body’s defenses.