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Over time, the field of psychology has made significant strides in the treatment of psychiatric conditions, including major depressive disorder (MDD), schizophrenia, and Alzheimer’s disease (AD). Depression, also known as clinical depression, is a prevalent mental health condition defined by persistent feelings of sadness, hopelessness, and emptiness, all of which significantly impact the quality of life. According to the World Health Organization (WHO), approximately 3.8% of the global population experiences depression, with 15% of those affected dying by suicide. This review focuses on the emerging role of psychobiotics in treating clinical depression. Recent studies indicate that psychobiotics, which combine probiotics and prebiotics, offer potential therapeutic benefits. These compounds not only introduce beneficial bacteria to the gut but also support the growth of existing gut microbiota. Research on the gut-brain axis has revealed its key role in the effectiveness of psychobiotics, offering promising results for improving mental health. Beyond treating psychological disorders, psychobiotics also contribute to overall health by enhancing gut function.