21 Jun 2018 --- Those hoping to alleviate their anxiety with the use of probiotics should probably put down that yogurt spoon or supplement bottle and call a professional instead. This is according to researchers from the University of Kansas who reviewed available research, finding evidence that probiotics can reduce anxiety in rodents, but not in humans. The researchers reviewed data from 22 preclinical studies involving 743 animals and 14 clinical studies of 1,527 individuals, and found that probiotics did “not significantly reduce symptoms of anxiety in humans and did not differentially affect clinical and healthy human samples.”