Product labels list ingredients that a product is known to contain. What they don’t include are contaminants and additives that ingredients may come into contact with as they enter the food supply chain. These can include heavy metals (e.g. lead, arsenic and mercury) and ‘legacy’ chemicals that, in the case of food, leach into the soil and water in which ingredients are grown as a result of agriculture methods, industry and mining activities. Transportation and storage systems provide additional opportunities for contamination. At Clean Label Project, we understand that no food product will be 100 percent free from all unwanted contaminants, but we believe we consumers should know which products are the purest*, meaning that they contain the least number of contaminants.