"Effect of Probiotics Psychobiotics on Depression and Metabolic Syndrome in Saudi Arabia"

The investigational product is a multispecies probiotic formulation consisting of 9 selected probiotic strains: the following bacterial strains: Bifidobacterium bifidum W23, Bifidobacterium lactis W52, Lactobacillus acidophilus W37, Lactobacillus brevis W63, Lactobacillus casei W56, Lactobacillus salivarius W24, Lactococcus lactis W19 and Lactococcus lactis W58.

The placebo is composed of the carrier of the probiotic product that are identical in physical appearance, it includes maize starch and maltodextrins but contains no bacteria.