Copper Sulfate is designated as “Generally Recognized as Safe” by the FDA: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=184.1261 TITLE 21–FOOD AND DRUGS CHAPTER I–FOOD AND DRUG ADMINISTRATIONDEPARTMENT OF HEALTH AND HUMAN SERVICES SUBCHAPTER B–FOOD FOR HUMAN CONSUMPTION (CONTINUED) PART 184 — DIRECT FOOD SUBSTANCES AFFIRMED AS GENERALLY RECOGNIZED AS SAFE Subpart B–Listing of Specific Substances Affirmed as GRAS Sec. 184.1261 … Continue reading Copper Sulfate as a Supplement, Notes