Although hundreds of different adjuvants have been tried. aluminum-containing adjuvants are by far the most widely used currently. It is worth mentioning that although aluminum-containing adjuvants have been commonly applied in vaccine production. their acting mechanism remains not completely clear. https://www.roneverhart.com/MagnaFlow-2000-Dodge-Dakota-California-Grade-CARB-Compliant-Direct-Fit-Catalytic-Converter/