Chapter 43: FDA says Copper Sulfate is “GRAS”: Generally Recognized as Safe Copper sulfate is defined in law as “generally recognized as safe”, specifically allowed for use as a “nutritional supplement”. I am not listing this as proof that copper is safe. This is only evidence of what US law says regarding the subject. For … Continue reading Chapter 43: FDA says Copper Sulfate is “GRAS”: Generally Recognized as Safe