Additional information can be found in my thesis: Jackson, Peter (2023). An exploration of the prebiotic concept: from food matrix to mood state: Volume II: Effect of prebiotics and prebiotic candidates microbial composition and mood state - Chapter 4: Inulin-type fructans and 2'fucosyllactose alter both microbial composition and appear to alleviate stress-induced mood state in a working population - A double-blind randomised placebo controlled trial.