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FDA
As far as is known, the government does not allow heavy metals in foods, but they allow them in other things, like vaccines, and they allow many additives and preservatives in foods that are harmful. Concerning GMOs, the government claims that they are not harmful or dangerous, and they are considered to be "substantially equivalent" to non GMOs by the FDA. There are various theories as to why the US government seems to promote GMOs, but none of the theories are substantiated.
FDA and other health experts warn consumers about the potential health about what types or concentrations of potentially harmful chemicals.
Some say GMO foods are not harmful. Others say they are harmful. Still others, who are probably right, say it is not known whether they are harmful, though we do know that the FDA has doubled what is considered the acceptable level of glyphosate in foods (the herbicide used on a large percentage of GM crops), glyphosate is harmful to the soil, crops that are resistant to other synthetic pesticides have been developed, many people who choose to eat non-GMO diets at the advise of their doctors have improved health, etc.
FDA is a food labeling service. This is on foods international.
The Food and Drug Administration's role in the food supply is to approve new foods (including additives, preservatives, and genetically modified) after tests have shown they are safe, recall foods that have been contaminated and are harmful, etc.
Canned goods.
Sodium Benzoate
The FDA
Revitol's ingredients uses only materials that are approved by the FDA. There are no synthetic chemicals or harsh dis-solvers. An example is Revitol's Hair Removal which is FDA approved.
The FDA shut the a distributor by the name of Chetak Foods, Chicago because of hygiene issues. The facility has since been re-opened. A statement has been made by Deep Foods Inc and can be read in the discussion page of this answer.
i believe that there have been at least 200 modified foods