Inclusion Criteria:  18 years and over ≤ 10 days between the COVID-19 diagnosis and the inclusion Having symptoms of the COVID-19 at inclusion Living in Quebec for the next 90 days Self-caring at home Able to take medication alone With access to a phone or to the Internet Able to give informed consent  Exclusion Criteria:  Taking probiotic supplements at inclusion Taking antibiotics for a reason other than COVID-19 at inclusion Allergies to soy, lactose, yeast, maltodextrin, vitamin C, potato starch, magnesium stearate, hypromellose or titanium dioxide Has a chronically weakened immune system (AIDS, lymphoma, chemo-radio-corticosteroid therapy, immunosuppressive pathology) Was treated with chemo-radio-corticosteroid therapy in the last 6 months Has active cancer Taking immunosuppressive drugs (e.g. anti-rejection treatment after organ transplant) Already participating in another randomized clinical trial Is pregnant, expects to become pregnant in the next few months or is breastfeeding Has any other condition that would prevent safe participation in the study