Heavy metals like cadmium and lead naturally occur in the Earth's crust, so it's impossible to totally eliminate them. But human activities such as mining, fracking, industrial agriculture and the use of waste water for irrigation, exacerbate the presence of heavy metals in air, water and soil in the form of pollution, Bowen argues. Unlike microbial pathogens which can be destroyed by high heat and other methods, there's no way to get rid of such contaminants once they are in a product, she says. Instead, the problem has to be addressed at the start of the process, by beginning with clean, uncontaminated soil. After all, formula starts with farming, since key ingredients come from dairy livestock or crops.





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