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High doses of vitamins over a long period of time can lead to side-effects. General symptoms include nausea, vomiting, diarrohea, rapid breathing, rashes are common with any vitamin overdose. Each vitamin also has specific symptoms associated with its overdose
A few examples of the risks include:
Vitamin A - an increased risk of broken bones, headache, nausea, vomiting, drowsiness, blurred vision and frontal headaches are often the first signs of toxicity.
Vitamin B6 - loss of feeling in the arms or legs called peripheral neuropathy, rapid breathing, burning pain, loss of muscle coordination, paralysis.
Vitamin B2 - turns the urine yellow-orange.
Vitamin B1 - rapid heartbeat, low blood pressure, irregular heart beat, headache, convulsions
Vitamin B3 - Signs include skin flushing, itching, wheezing, headache, diarrohea, and vomiting.
Vitamin B 9 - central nervous system damage.
Vitamin D - muscle weakness, headache, loss of appetite, nausea, vomiting, and bone pain. Overdose during pregnancy can cause mental and/or physical retardation in infants.
Vitamin E - overdose toxicity symptoms include nausea, headache, fatigue, easy bruising and bleeding, double vision and muscle weakness.
Vitamin C - high doses can cause diarrhea and upset stomach, and can also cause newborn scurvy.
There is also evidence that taking high doses of antioxidant vitamins A, C and E may increase the risk of cancer.
http://ezinearticles.com/?Effects-of-Vitamin-Overdose-and-Precaution&id=446602
Shelly
Found out apparently that I get enough and even well over the RDA values on all Vitamins and Minerals.
Now I go to Fitday.com and log in my diet, and you click on "reports", and up comes the RDA levels. It's pretty cool.
So not unless someones "deficient" in their diet, most vitamins are not nescessary. But at least a multi-vitamin is recommended if the diet is not up to par.
Shelly