evidence: Studies demonstrate that even low levels of toxic substances like mercury or aluminum (which is in some vaccines) can be dangerous. [...] "Thimerosal (an ethylmercury-containing compound used as a preservative in vaccines )…22 studies from 1971 to 2019 show that exposure to ethylmercury-containing compounds (intravenously, intraperitoneally, topically, subcutaneously, intramuscularly, or intranasally administered) results in accumulation of mercury in the brain. In total, these studies indicate that ethylmercury-containing compounds and Thimerosal readily cross the Blood-brain-barrier, convert, for the most part, to highly toxic inorganic mercury-containing compounds, which significantly and persistently bind to tissues in the brain, even in the absence of concurrent detectable blood mercury levels."