Bloody diarrhea, vomiting, hemosiderosis, hemochromatosis, cirrhosis, diabetes, cardiac failure, increased incidence of hepatoma, and may compromise zinc and copper absorption. 150 mcg 2 mg Blocks formation of thyroid hormones usually temporarily but can be permanent and may cause goiter. None 1 mg Fingernail changes, hair loss, nausea, abdominal pain, diarrhea, fatigue, irritability, and peripheral neuropathy. None 10 mg Antagonistic to copper and increased incidence of gout. Number to the left is for men and number to the right is for women.
Reference gives RDAs for other age groups.
The U.S. RDA is used as a standard for nutritional labeling. The Food and Drug Administration has proposed changes in this labeling. Symptoms of Toxicities Table 1 gives the symptoms of vitamin and mineral toxicities. Toxicities occur at lower intake levels in infants, children, and pregnant and lactating women. If a woman takes excessive amounts of many vitamins and minerals while pregnant her child can be affected.