No merece la pena tomar vitamina C para los catarros Quackwatch quackwatch.org No merece la pena tomar vitamina C para los catarros quackwatch.org Does vitamin C prevent colds quackwatch.org quackwatch.org Quackwatch quackwatch.org Vitamin C: Do High Doses Prevent Colds? Quackwatch article critical of megadosing at least 30 well-performed controlled trials quackwatch.org quackwatch.org which is debatable, to put it very mildly quackwatch.org quackwatch.org Quackwatch