Pharma Foods International Co., Ltd. published a new collaborative study with Kyushu University in the “International Journal of Molecular Sciences”, revealing a novel mechanism by which long-term GABA intake may help improve age-related cognitive decline through exosome-mediated gut–brain interaction.
Our previous human clinical studies exhibited that intake of PharmaGABA supports stress relief, relaxation, sleep quality, and cognitive function. However, because GABA is generally considered to have limited ability to cross the blood–brain barrier, the biological mechanism behind these cognitive benefits has remained unclear.
To investigate the mechanism, researchers focused on exosomes — small extracellular vesicles involved in cell-to-cell communication. Aged mice were given drinking water containing 0.5% GABA for eight weeks, while the control group received sterile water. Researchers then isolated exosomes from the blood and administered them to other aged mice, followed by cognitive evaluation using a novel object recognition test.
Aged mice receiving exosomes derived from GABA-treated mice showed significantly improved cognitive performance, reaching levels comparable to young mice (Figure 1). In contrast, this effect was not observed when exosomes from control mice were administered, suggesting that the cognitive benefits were specifically associated with exosomes produced in response to GABA intake.
The study also demonstrated reduced neuroinflammation and suppression of cellular aging markers in the hippocampus, a brain region closely associated with memory and cognitive function. These findings suggest that exosomes may play an important role in mediating communication between the gut and brain following GABA intake.
This latest research offers new insight into the gut–brain axis and further reinforces the scientific credibility of PharmaGABA® as a natural GABA ingredient, supported by both strong clinical studies and emerging mechanistic evidence.
Title: GABA-Induced Exosomes Improve Memory Impairment in Aged Mice
Journal: International Journal of Molecular Sciences
Published: March 10, 2026
DOI: 10.3390/ijms27062519