https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8366152/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9996805/ https://www.sciencedirect.com/science/article/abs/pii/S0257897213002934 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7764683/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3067274/ https://indianapublicmedia.org/amomentofscience/the-germ-killing-power-of-copper.php
