"dietary supplements," "mineral supplements," and "MVMs."

For each dietary supplement, the price, origin, method of administration, dosage, and mineral contents claimed on the label were investigated. Of those 149 dietary supplements, those without mineral or single mineral were excluded from this study, leaving a final analytic sample of 90 MVM supplements.

Analysis of mineral contents in MVMs
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Fourteen minerals were found in 90 MVM supplements: calcium, phosphorus, sodium, potassium, magnesium, iron, zinc, copper, manganese, iodine, selenium, molybdenum, chromium, and boron. The price and number of minerals of the 90 MVM supplements was analyzed and compared according to their price per bottle (low, medium, high) and the origin (domestic, imported). The daily supply of 14 minerals from MVM supplements was analyzed and compared according to target population (adults, men, women, and children).Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

Once again, President Donald Trump pointed to Chicago's crime rate to say that stricter gun laws wouldn't necessarily stop the spate of mass shootings or gun violence across the country.

"Chicago is a disaster, a total disaster," he told reporters Tuesday during his stop in South Korea — two days after a gunman killed 26 people at a church in rural Texas. Trump was asked whether the shooting had changed his position on gun control legislation.

Related: Why Mass Public Shootings Are Getting Deadlier

But researchers say Trump's incorrect claim that Chicago has the "strongest gun laws" in the U.S. but still grapples with a high rate of gun violence shows that America's third-largest city would