* patients with covid-19 disease (clinical and serological data at post); * with possibly affected cognitive functions (score \< 12 on the functional activities questionnaire (faq)) * with allergies (soy, lactose, yeast, maltodextrin) * with a chronically weakened immune system (aids...) * undergoing anti-cancer treatment (chemotherapy or radiotherapy) * who do not speak french or english.

* patients with covid-19 disease (clinical and serological data at post); * with possibly affected cognitive functions (score \< 12 on the functional activities questionnaire (faq)) * with allergies (soy, lactose, yeast, maltodextrin) * with a chronically weakened immune system (aids...) * undergoing anti-cancer treatment (chemotherapy or radiotherapy) * who do not speak french or english.

* patients with covid-19 disease (clinical and serological data at post), with possibly affected cognitive functions (score \< 12 on the functional activities questionnaire (faq)), with allergies (soy, lactose, yeast, maltodextrin), with a chronically weakened immune system (aids...) or undergoing anti-cancer treatment (chemotherapy or radiotherapy) and who do not speak french or english.

* patients with covid-19 disease (clinical and serological data at post), with possibly affected cognitive functions (score \< 12 on the functional activities questionnaire (faq)), with allergies (soy, lactose, yeast, maltodextrin), with a chronically weakened immune system (aids...) or undergoing anti-cancer treatment (chemotherapy or radiotherapy) and who do not speak french or english.

patients with covid-19 disease (clinical and serological data at post), with possibly affected cognitive functions (score < 12 on the functional activities questionnaire (faq)), with allergies (soy, lactose, yeast, maltodextrin), with a chronically weakened immune system (aids...) or undergoing anti-cancer treatment (chemotherapy or radiotherapy) and who do not speak french or english.

patients with covid-19 disease (clinical and serological data at post), with possibly affected cognitive functions (score < 12 on the functional activities questionnaire (faq)), with allergies (soy, lactose, yeast, maltodextrin), with a chronically weakened immune system (aids...) or undergoing anti-cancer treatment (chemotherapy or radiotherapy) and who do not speak french or english.