A member asked:

What brand or exactly should i buy from walmart in vitamin c to prevent upper respiratory infections. i also doing the rest like exercise and eat righ?

A doctor has provided 1 answer

Forgive my frankness: Vitamin c does not prevent colds. Neither does confirming to some health guru's claims about "eating right". You are going to catch a few upper respiratory viral infections yearly. We doctors do too. I am very glad you are exercising but the benefits, though great, are modest in promoting anti-viral immunity. Best wishes.

Answered 12/26/2016

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