Vitamin and mineral supplements have shown their futility
According to the findings of a group of Canadian scientists at the University of Toronto and the Hospital Saint-Michel, published in the journal Journal of the American College of Cardiology, the daily use of vitamin and mineral supplements is practically has no expected positive effect.
Deficiency of certain nutrients derived from food (vitamins, minerals and antioxidants), often try to compensate with the help of dietary supplements. Such additives are not clinical trials, due to which is not considered a drug, and their turnover almost not adjusted.
A systematic analysis of the results of more than a hundred previous studies conducted from January 2012 to October 2017, the researchers found that the most popular multivitamin supplements containing vitamins C and D as well as calcium, do not have any practical use on human health. In addition, the scientists point out that found no evidence that the use of vitamin supplements really reduces risk of cardiovascular disease, heart attacks, strokes and early death.
Exceptions were perhaps only folic acid and less complex group of vitamins B, which have shown to be useful for the prevention of diseases of the cardiovascular system, in particular stroke.
"We were surprised to find only a few positive effects, rendered popular vitamin and mineral supplements," - says Dr. David Jenkins, lead author of the study.
"Our research shows that if you want to use a multivitamin, vitamin D, calcium, or vitamin C, in this there is no harm, but as it turned out, too, and the good will not be any."
Meanwhile, the study found that excess niacin content indicators (vitamin B3) and antioxidants in the body, in turn, may be associated with an increased risk of death. This is explained by the fact that niacin can have a negative effect on blood sugar levels. Antioxidants ( "free radicals") are naturally produced by the body in sufficient quantity. And their overabundance can lead, for example, to a breach of natural anti-cancer mechanisms in the body.
According to the researchers, most often an overabundance of vitamins and minerals in the body is due to the excess of human norms prescribed by doctors.
"This study suggests that people should be more careful in choosing supplements, and only use the amount of vitamins and minerals, which is prescribed by the attending physician in each case", - says Jenkins.
The objects of study, researchers have used the vitamins A, B1, B2, B3 (niacin), B6, B9 (folic acid) and minerals carotene, calcium, iron, zinc, magnesium and selenium.
The researchers also found that some compounds exhibit a higher efficiency compared to the other. For example, communication has been noted between the use of zinc containing additives and reduced development time of cold effects. Despite the widespread belief in the efficacy of vitamin C, it is no practical benefit in this is not shown.
"In the absence of any significant positive effects - other than folic acid, which reduces the potential risk of developing cardiovascular disease - more common solution is to rely on healthy foods that can provide your body with essential vitamins and minerals," - Jenkins says.
"There is no research showing that the use of nutritional supplements can be more useful than a healthy diet, which includes fresh fruits and vegetables as well as nuts."
Canadian researchers suggest that a possible reason for the lack of a positive effect of receiving dietary supplements on human health can be and composition of additives. And in some cases, dietary supplements may be a health hazard at all. So, Consumer Reports magazine two years ago analyzed the composition of some popular dietary supplements, and found in them a danger to human health substances which can cause destruction of the digestive system, arrhythmia, dizziness, and the development of cancer.