Be careful of supplements over-consumption

Some known risks of nutrients consumed at excessive potencies are:

Folic acid: Intakes higher than 1 milligram a day may mask symptoms of vitamin B12 deficiency while pernicious anemia caused by the deficiency progresses undetected.

Iron: As few as six high-potency iron tablets could seriously injure a child weighing 22 pounds or less. Iron is the most common cause of U.S. child poisoning deaths, causing about 2,000 poisonings a year,mainly in young children taking their mothers' prenatal supplements.

Niacin: High intakes can damage the liver and cause severe gastrointestinal problems.

Selenium: High intakes can damage tissue, especially in tissues or organs where selenium concentrates. Toxicity depends on the chemical form and the selenium content of the foods eaten and has occurred with high intakes after a few weeks.

Vitamin A: Continuous high intakes can cause headaches, liver damage (including cirrhosis), bone damage, diarrhea, and, during pregnancy, birth defects.

Vitamin B6: High intakes can cause bone pain, muscle weakness,numbness, or other symptoms of nerve disorder.

Vitamin C: Very high intakes can cause diarrhea and may cause urinary tract problems.

Vitamin D: Continuous high intakes can cause kidney damage and bone deformity.

source:FDA (n.d.)Dietary Supplements: Making Sure Hype Doesn't Overwhelm Science Retrieved from http://www.fda.gov/bbs/topics/CONSUMER/CON00259.html