I managed to get through this winter without being totally stuffed up

[conuly]

or wheezing, but now I'm super tired all the time. I wonder if I managed to come down with something after all but the only symptom is being tired? (Okay, and having a very small amount of phlegm, but I'm not drowning so I hardly notice it.)

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Comments

[mtbc]

Could it be lack of sunshine? I've been taking vitamin D in case that helps anyway (D3 + K2).

[conuly]

Maybe? Can't hurt, anyway. (Wait, Vitamin D is one of those you can't overdose on, right?)

[mtbc]

Not sure? At some point I formed the opinion that my current 75µg of D3 and 100µg of K2 per day is okay and maybe useful but alas I no longer remember how or why. Generally I figure that water-soluble is harder to overdose on and some googling suggests D3's fat-soluble instead so maybe too-much is easier to achieve. Though I also don't now recall why a bit of K might be good to have with it. Maybe someone more knowledgeable will stop by, I'm too good at drawing conclusions then forgetting how I got there.

For some weeks I was often feeling tired and got to wondering if it's possible to have some barely symptomatic sinus infection lingering or somesuch.

[darkoshi]

I also started taking Vitamin K along with my Vitamin D this last year.
This page gives some reasons it may be good to do so:
https://www.healthline.com/nutrition/vitamin-d-and-vitamin-k

I think there is an upper limit on how much Vit D you should take per day, but what that limit is varies depending on what you read. Most things I read indicate that in the U.S. most people are so low on Vit D that even fairly high amounts are ok.

[hilarita]

You *can* overdose on Vitamin D, but it's really bloody hard to do this in the Northern Hemisphere in winter, even if you're very light-skinned.

[hilarita]

Like, I had some tests done earlier this winter. I'm supplementing at 500% of the NRV, and my results are at the top end of normal. To be at an overdose point as determined by the blood test, my blood levels would need to be over 100x higher than they actually were.

For reference, I usually start taking Vit D in late September, and stop taking it by the time I can leave work in the light again.

[hudebnik]

I too have been taking daily vitamin D during the dark half of the year, for several years: I still catch colds and the like, but I don't think I've had a really BAD cold-or-flu (bone-tired, my hair hurts, throwing up in the middle of the night) in those years.