An international research team from the University of Minnesota and the University of Eastern Finland argues that people do not need to take vitamins and vitamin supplements.
However, in addition to the absence of the need to take vitamin complexes, scientists say that taking synthetic vitamin preparations can cause early death, especially for older women. According to the results of the study, scientists named vitamins and minerals that led to an increase in the likelihood of early death. To these vitamins and minerals, scientists attributed supplements containing iron, vitamin B6, multivitamins, folic acid, as well as zinc, copper and magnesium.
The data were obtained as a result of an analysis of statistical information by scientists on the health status of women living in the state of Iowa. In total, the study examined the medical records of 38,772 women over 62 years of age. To correlate the data, the respondents were asked to fill out questionnaires in which they had to indicate which food additives they used and when.
An analysis of the data obtained showed that in women who then started taking vitamins regularly, mortality increased from 66 to 85 percent, while people led a healthy and active lifestyle, but still died more often than those who did not take vitamins.
Scientists have not yet figured out what determines this pattern, but they recommend less use of synthetic vitamins.
Surprisingly, the negative effects of consuming 
artificial vitamins are only now being discovered. So, in 2008 alone, Americans spent $9 billion on vitamins. Moreover, the United States is still the only country in the world in which the unlimited use of vitamins leads to urolithiasis. On average, 1 million Americans a year are hospitalized with this startling diagnosis.
It is also not news that vitamins can kill. Of course, for a fatal outcome, you need to eat about 5 thousand pieces in a short time. But hypervitaminosis, which is a consequence of vitamin poisoning, is a rather unpleasant thing.
So, for example, here are some symptoms of an overdose of vitamins:
vitamin A – headache, dizziness, nausea, increased heart rate, loss of consciousness and convulsions;
vitamin B1 – dysfunction of the liver and kidneys;
vitamin B12 – increased heart rate, increased blood clotting;
vitamin D2 – weakness, thirst, vomiting, fever, increased blood pressure, shortness of breath, slow heart rate;
vitamin E https://en.wikipedia.org/wiki/Vitamin_E – metabolic disorders, thrombophlebitis, necrotizing colitis, renal failure, retinal hemorrhage, hemorrhagic stroke.
