Although not technically deception, participants will receive either a placebo or probiotic for ten-week intervals in the study period but will not be told which of the two they are receiving, although they will be informed that they will not be told. Upon completion of the study, participants who wish to know will be told which of the two (probiotics or placebo) they received during each ten-week period. Participants will also be given the opportunity to have all of their questions answered by the researcher and those who wish to receive a copy of the results will be sent them via email once the study is complete.