https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8421583/Astaxanthin protective barrier and its ability to improve the health in patients with COVID-19 - PMC (nih.gov)   https://pubmed.ncbi.nlm.nih.gov/33113418/Potential of natural astaxanthin in alleviating the risk of cytokine storm in COVID-19 - PubMed (nih.gov)