A small clinical trial has found that taking a daily probiotic supplement alongside standard antidepressant medication may offer additional relief from depression and anxiety symptoms in seniors. The study, published in the Journal of the American Geriatrics Society, adds to growing evidence that gut health and mental health are closely linked.
Researchers in India enrolled 58 adults aged 60 and older with moderate depression. Half received a probiotic supplement daily for 12 weeks while continuing their regular antidepressant treatment. The other half received a placebo. Both groups improved over the study period, but those taking the probiotic experienced somewhat greater reductions in their depression and anxiety symptoms.
The findings reinforce an emerging scientific theory about what researchers call the gut-brain connection. The human digestive tract contains trillions of microbes that may influence mood and mental health through various biological pathways. Probiotics are live microorganisms designed to help maintain a healthy bacterial balance in the gut.
To measure the effects, researchers used psychological rating scales to assess depression and anxiety. They also examined a protein called brain-derived neurotrophic factor, or BDNF, which plays a role in nerve cell growth and survival and is frequently studied in mental health research. Additionally, scientists analyzed participants' gut bacteria to track changes in microbial composition.
The probiotic group showed measurable biological improvements alongside their symptom reduction. However, researchers found no clear advantage in overall quality of life when comparing the probiotic group to placebo recipients.
As a pilot study involving just 58 participants, the results remain preliminary. Larger clinical trials will be needed to determine which patients benefit most from probiotics and whether the effects hold across different populations. Yet researchers view probiotics as a potentially safe complement to existing depression treatments.
Dr. Saibal Das, a co-author from India's National Institute for Research in Bacterial Infections, said the team is planning a larger follow-up trial based on the encouraging initial findings. Co-author Abhinaba Ghosh, a physician-neuroscientist, emphasized the goal of developing affordable mental health solutions that can reach broader populations.
Author Jessica Williams: "This is solid early evidence that something as simple as a daily probiotic could meaningfully improve outcomes for depressed seniors already on medication, but we're nowhere near recommending it as standard care yet."
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