- Patients admitted to the ICU (COVID-19-related)- COVID-19-related cardiac or pulmonary tissue damage- Acute infection or current systemic immunological disorders- Oral and/or inhaled use of corticosteroids or use of other immune-modulatory medication - Current psychiatric disorders- Communication difficulties- Pregnant or lactating women- Age >70 years- Patients with milk allergy or a known or suspected allergy or any contraindications to lactoferrin or microcrystalline cellulose (lactoferrin can be used by individuals with lactose intolerance)

- Patients admitted to the ICU (COVID-19-related)- COVID-19-related cardiac or pulmonary tissue damage- Acute infection or current systemic immunological disorders- Oral and/or inhaled use of corticosteroids or use of other immune-modulatory medication - Current psychiatric disorders- Communication difficulties- Pregnant or lactating women- Age >70 years- Patients with milk allergy or a known or suspected allergy or any contraindications to lactoferrin or microcrystalline cellulose (lactoferrin can be used by individuals with lactose intolerance)