Joanne Klitzman: I think we should avoid megatosing because these micronutrients and dietary supplements are not inert. Look at the label if you take any sort of dietary supplement, look for several things on the label to see whether there is a recommended Dietary Allowance or daily intake. She says high doses of an isolated micronutrient can interfere with the absorption of other similar micronut nutrients such as beta-carotene.klitzman: Some studies do show a little bit of benefit taking it for short term during an upper respiratory infection was still reasonable. It has not been shown to be a benefit in the large scale randomized clinical trials.

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