Have you come across any recent randomized controlled trials assessing probiotics' effect on cognitive impairment in depression beyond what's already included in existing meta-analyses?
Yes, two recent studies you might find relevant are DOI:10.1002/brb3.70401 and DOI:10.1097/MD.0000000000036005. I’m actively researching this area too and would be open to collaborating if you’re diving deeper!