Our digestive system is often described as the “second brain,” and for good reason — through the gut–brain axis, it communicates directly with our nervous system, influencing not only digestion, but also immunity, metabolism, mood, and overall mental well-being. 

At the centre of this complex system lies an important relationship: the interaction between probiotics, prebiotics, and the short-chain fatty acids (SCFAs) they produce. 

When probiotics undergo fermentation in the presence of prebiotics, they produce SCFAs such as acetic, propionic, and butyric acid. Among these SCFAs, butyric acid plays a particularly vital role in maintaining gut health.

Butyric acid serves as the primary energy source for the gut cells, helping them function, repair, and maintain a strong intestinal barrier.