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It is a randomized controlled study, meaning that similar patients were assigned at random to either get either Centrum or placebo.
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But sales of Centrum are probably in the high hundreds of millions per year, and this will help them stay there or grow.
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The authors report some minor conflicts of interest, but none of them work for or received major funding from Pfizer (PFE, the manufacturer of Centrum).
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This study is good news for Pfizer, which makes Centrum.
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He refuses to disclose current consulting specifics because of confidentiality agreements, but two decades ago, he says, he advised Centrum to produce a vitamin for older people, Centrum Silver.
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These included big brands like Sanatogen, Centrum and Quest.
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Mr Frans Roumen, a gynaecologist at the Atrium Medisch Centrum in Heerlen, in the Netherlands, said his studies, published in the journal Human Reproduction showed it to be as effective as oral contraceptives.
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