I’ve personally been taking 7500 IU daily for many years now. Anecdotally (yes, I know, N=1) I have noticed I get sick less. I just did the math and apparently I’m taking the same dose as the participants in this article. I firmly believe the RDA is wrong, and the “high dose” of this article is closer to what the RDA should be.
I can’t find the article which caused me to originally start my 7500 IU regiment but there are many similar papers out now, such as:
>Soccer players that supplemented with 6,000 IU of vitamin D significantly improved their blood vitamin D levels, increased their free and total testosterone, and performed better on the 5 m sprint test compared to the placebo group.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7284423/
I can’t find the article which caused me to originally start my 7500 IU regiment but there are many similar papers out now, such as:
>Soccer players that supplemented with 6,000 IU of vitamin D significantly improved their blood vitamin D levels, increased their free and total testosterone, and performed better on the 5 m sprint test compared to the placebo group. https://pmc.ncbi.nlm.nih.gov/articles/PMC7284423/