Does it prevent or speed up macular degeneration?.
Vitamin-zinc pills -- marketed under names like Preservision and Vitalux -- are supposed to help stop the advance of macular degeneration.
But the Toronto company Arctic DX says its DNA research indicates the opposite -- that the pills actually increase the risk of vision loss, Canada's National Post reports.
Now the tiny Canadian company and a powerful U.S. government research agency are fighting over the safety of the popular anti-blindness supplement, and each side accuses the other of having scientific opinions tainted by commercial interests.
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