Participants will be contacted by the researcher on the third and sixth day of each phase (probiotic and placebo) via email to check in and answer any questions they may have (see Appendix I). Participants will be asked to complete a brief questionnaire once every two weeks during the study period, which should take no longer than 5 minutes to complete (see Appendix J and Appendix K), to chart any changes in anxiety and/or physical health, as well as to keep the lines of communication open should any questions arise.