note the MSM don't tell you want those toxic chemicals are in the masks: Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10112860/ Formaldehyde((methanal)formyl group), acetaldehyde(formyl group), and propionaldehyde (formyl group) 2,4-dinitrophenylhydrazine(methanol and some concentrated sulfuric acid) and Acetonitrile (methyl cyanide)