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Immune System

Athletes are turning to intravenous vitamin therapies in attempt to boost performance

Perched atop the TD Waterhouse Tower, the Clinic for Sports Medicine at the Toronto Athletic Club (TAC) has a commanding view of the city. But the masters of the universe being treated here must be immune to such thrills. They are as consumed by their smart phones as any pack of teens at a bus stop.

Scientists: Nanotech-based products offer great potential but unknown risks

Zinc oxide would be the perfect sunscreen ingredient if the resulting product didn't look quite so silly. Thick, white and pasty, it once was seen mostly on lifeguards, surfers and others who needed serious sun protection.