Hebrew University of Jerusalem researchers have discovered that a thin coating of natural, sustainable, cellulose nanocrystals (CNCs) applied to human skin, decreases the number of mosquito bites by 80%. In combination with the naturally occurring amino acid Indole, it is over 99% effective.
https://www.jns.org/hebrew-u-researchers-develop-new-method-to-prevent-mosquito-bites/
https://pubmed.ncbi.nlm.nih.gov/37056470/