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Two respondents skipped this question.

So the majority responded "None of the above." - No vitamins, including Vitamin-D, and no tests of blood levels.

Of course adding all those responses that are other than "None of the above," presents a sizeable contact with nutritional supplements in some form.

The key question is of course, do they make a difference? And more specifically, in the setting of "long-term" COVID-19 ? Are marketed nutritional supplements purchase simply driven by a desire to do all that one can to stay "healthy"?

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As already mentioned, detailed comparisons are being saved for later, to allow more efficient "first pass" presentation of the questionnaire and its preliminary results.

But here is a preview of such comparisons.

Does taking nutritional supplements make a difference

in current outcome from the "long-term" COVID-19 illness in this sample of respondents?

Here first are those who ...

And those who ...

Were there group differences? A total of 118 useable responses. 

Age? : No significant difference (NSD).

Gender? : Chi² = 1,060: NSD

Were there outcome differences in mean values obtained with or without supplements?

Duration of illness : No difference as a function of supplement use.

Delay of diagnosis : One day shorter with supplements, but not a significant difference.

Time to start feeling better: p = 0.5403: NSD

Time from start of illness to feeling worse again: NSD

And while not presented here, but later, no statistically significant differences in number of symptoms or organ systems involved as a function of supplement use.

Were any of these analyzd results close enough, that doubling the sample size (or even more) might make a difference? Probably not.

Other specific respondent subgroups, for example those with Vitamin-D serum levels that were normal or not before illness, will be looked at subsequently. 

Can these supplements change energy levels at a cellular level? Nothing here to suggest that is happening, but this is not a controlled study of specific supplements. 

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