* 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

* 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

- 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

- 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