For this reason, most supplement companies do not take the extra steps to test their products to ensure safety and purity. (rootcology.com)
Next they «adjusted out» other lifestyle factors, which then resulted in most supplements contributing to earlier death. (articles.mercola.com)
Clearly you shouldn't go ridiculously overboard, but the daily allowance is 15 mg and most supplements contain about that quantity. (supernaturalacnetreatment.com)