Emergen-C contains 1000mg of Vitamin C and Airborne contains 1000mg of Vitaminc C. Just 1 of these items more than satisfies your daily intake of vitamin C so on a regular basis you should not be taking both. However, if you are sick, or know that you lack vitamin C in your diet it would be ok to take both products together every once and a while. It's like the saying " everything in moderation". You don't want to overflow your body with any one viatmin.
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I would not take the two product in conjunction, as they are not meant to be taken together. I also would not take the Emergen-C for long periods of time (i.e., daily). It has high levels of vitamin B6 which can cause permanent nerve damage (neuropathy) to the extremities over time. If caught early, this neuropathy may be reversible. However, if left untreated and unrecognized can become permanent. Neuropathic symptoms in the extremities are more often diagnosed as diabetes related and the actual source of the problem missed as doctors unfamiliar with the syndrome likely to follow the wrong path.
Source(s):
http://www.drugstore.com/products/prod.asp?pid=158806&catid=9837&br...

http://ods.od.nih.gov/factsheets/vitaminb6.asp

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