Generally, when people catch a cold, their body's are under stress, their immune system is down and therefore, more susceptible to infection. Vitamin C is involved in the production of catecholamines, increases iron absorption (for healthy blood cell function), and enhances the action of Natural Killer cells in vivo, making it a very useful vitamin (in higher doses in those that are stressed) for those people who have a stressful lifestyle. This seems to be, in this day and age, most of the population.









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