My latest Vitamin D result is 143. No range given.
I have been taking 5000 iu for the past year (health issues including hospital stay last year.)
Should I be reducing the dose now that the weather is (hopefully) getting better?
Thanks for any advice.
We're not yet into British summertime, but even then, unless you're out in the sun all day every day you probably won't need much less.
Vit D should be tested twice a year at least until you understand how much your body needs in winter and summer.
NHS easy postal kit vitamin D test £31 via
With your current results you could probably afford to drop by 1,000ius a day to 4,000iu.
Vitamin D should be around 100 - 150.
Thank you. Will drop a bit and retest.
Ask for a bone profile blood test, to check that your serum calcium hasn't gone over range.
After a loading dose, I take 5000 IU on alternate days, for a level of about 100 nmol/L. With plenty of sunshine I was at 65 nmol/L, which corresponded with the Danish study of a few years ago for the sweet spot of lowest mortality. I don't get much sunshine these days and my level dropped to 26 nmol/L a year ago, but I don't notice any particular difference from supplementing, and it didn't stop me getting COVID-19 recently.
Unlikely I would get any more blood tests - current docs don’t like it if you appear to know more than they do! But I will drop dose for the summer. I am an outdoors sort of person anyway.
It may not have stopped you getting Covid, but it may have meant you were a lot less ill than you might have been!
I saw the following quote, in or before September, 2020. From this vantage point, the ratio of asymptomatic cases looks surprising. Like many, I had a severe respiratory infection, in November, 2019. Due to a study I participate in, I was tested in January, 2021, showing I had no antibodies. I was then infected with the "Kent" variant, about a month later. Mine was a "mild" case, in that I wasn't hospitalised. Even so, in no way was it "just a cold", although the figure given for asymptomatic cases could explain one influence on the viewpoint of those who are currently denialists.
The problem with the vit D "science" studies is that they never count in the asymptomatic cases which we know (via antibody tests) are 8-10 times more than symptomatic confirmed cases. Since vit D3 insufficiency is quite common you end up with significantly more asymptomatic cases with D3 insufficiency than mild cases with normal D3 levels. This alone invalidates the theory that D3 insufficiency is a predominant factor in making one susceptible to covid. The same was said for decades about vit C in common cold and was never really proven. But it helps researchers pamper their CVs and the pharma companies sell dietary supplements.
Vitamin D results
Vitamin D Blood Results
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Vitamin D Insufficiency? 
