45-1200 mg/day: According to the office of dietary supplements, the recommended daily amount of vitamin c for a 9 year-old is 45 mg, and the upper safe limit is 1200 mg. Here is a link for more information:http://ods.Od.Nih.Gov/factsheets/vitaminc-quickfacts/.
Answered 12/14/2016
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A doctor has provided 1 answer
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