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 https://pubmed.ncbi.nlm.nih.gov/28282880/Astaxanthin Inhibits PC-3 Xenograft Prostate Tumor Growth in Nude Mice - PubMed (nih.gov)  https://www.lifeextension.com/magazine/2017/12/update-astaxanthinNew Research on Astaxanthin and Cancer - - Life Extension   https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6266165/Astaxanthin Prevents Human Papillomavirus L1 Protein Binding in Human Sperm Membranes - PMC (nih.gov)  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7459748/Anti-Tumor Effects of Astaxanthin by Inhibition of the Expression of STAT3 in Prostate Cancer - PMC (nih.gov)