ZMA, which is composed principally of zinc, magnesium, and vitamin B6, is a legal, over-the-counter supplement.

NEWYORKER: King of Walks

As I wrote last year, a very large study of 38, 772 older women, who were followed for 25 years, showed that the risk of death INCREASED with long-term use of multivitamins, vitamin B6, folic acid, iron, magnesium, zinc, and copper.

FORBES: Do Multivitamins Prevent Cancer?

This week's ruling applies to materials like bauxite, coke, magnesium, manganese and zinc, but, most notably, does not apply to rare earths -- a group of 17 elements critical to the production of tablets, smartphones and myriad other gadgets.

ENGADGET: WTO ruling revives debate over China's rare earths trade