Where do HEAVY METALS come from? And how to REDUCE/ELIMINATE HEAVY METALS! Heavy metal toxicity includes aluminum, cadmium, lead, mercury and arsenic. One study looking at 2,000 hair analyses showed that aluminum was the most common heavy metal toxicity. This is likely due to aluminum contamination in our diet, over the counter medications like aspirin and ferrous sulfate (iron), aluminum in cooking (pots/pans/aluminum foil), deodorant etc. Mercury can be high in certain fish and is a particular