This very revealing study from 2015 makes it clear that non-protein capped 'Naked' Silver Nanoparticles perform better. Well, if that's the case then OPTI•MIST sprays are naked as a jay bird.
"The results revealed that bare nanoparticles were more effective as compared to the protein-capped silver nanoparticles with varying antibacterial potential against the tested Gram positive and negative bacterial species"
https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0134337&type=printable
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