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IANAMD.

It is my general understanding that unless you are severely deficient, Vitamin D supplementation generally takes weeks to bring levels up. It's unlikely that taking it for a few days is going to have any measurable impact on your recovery from illness unless you are severely deficient and/or taking MASSIVE doses, which may or may not be recommended depending on your prior levels and BMI.

See more here: https://www.ccjm.org/content/89/3/154

e: fixed broken URL

Very interesting thanks for sharing!

Same... In our family we start taking Emergen-C a few days before we travel also.

Which is very overpriced and doesn't do anything unless you're deficient. Excess vitamin C does nothing, it goes right through you.

> which typically helps me.

Uhm, how can you get to that conclusion? I mean: how can you compare the evolution of a cold with and without the vitamin surplus?

Very well could be a placebo

Reminds me of the old, with treatment, most colds will be cured in just 7 days! Without treatment they generally last about a week.

That said, do not underestimate the health benefits of the placebo effect. It can help a lot. Particularly with anything to do with stress.

So your statement should have been, "it seems to help."