inclusion criteria: - written informed consent obtained before any trial related procedures are performed - age ≥ 18 years - hospitalized patients with pcr confirmed sars-cov-2 infection and symptom onset ≤ 10 days before randomization - patients with respiratory covid-19 symptoms - randomization ≤ 48h from admission - peripheral capillary oxygen saturation (spo2) ≥ 90% on room air or supplemental oxygen at screening - patient agrees to refrain from taking other carragelose products (e.g. throat spray, lozenges)

inclusion criteria: - written informed consent obtained before any trial related procedures are performed - age ≥ 18 years - hospitalized patients with pcr confirmed sars-cov-2 infection and symptom onset ≤ 10 days before randomization - patients with respiratory covid-19 symptoms - randomization ≤ 48h from admission - peripheral capillary oxygen saturation (spo2) ≥ 90% on room air or supplemental oxygen at screening - patient agrees to refrain from taking other carragelose products (e.g. throat spray, lozenges)