GUT-FEELINGS: Using Citizen Science for Large-Scale Prebiotic Clinical Trials for Mental Health in Adults

The goal of this study is to evaluate the effects of different products in participants experiencing feelings of anxiety. The main question it aims to answer is: \- Do these products affect feelings of anxiety and related wellness outcomes compared with a placebo? Researchers will compare participants taking active products to those taking a placebo to see whether the active products influence feelings of anxiety and related outcomes, and to monitor safety. Participants will: * Be randomly assigned to receive either an active product or a placebo (an inactive look-alike). * Take their assigned product or placebo without knowing which group they are in until the study is completed. * Complete evaluations and tasks to track safety, feelings of anxiety, and related health outcomes.