Be careful.
Vitamin D is a hormone and is not risk-free. Unless you have been prescribed by your doctor.
In general, be careful with any fat-soluble "vitamins", as they can build up.
Vitamin D is a hormone and is not risk-free. Unless you have been prescribed by your doctor.
In general, be careful with any fat-soluble "vitamins", as they can build up.
42% of Americans are deficient, much more the darker your skin is.
https://www.healthline.com/nutrition/vitamin-d-deficiency-sy...
IIRC daily doses above 2000 over a longer timespan can (infrequently) cause your vitamin B12 levels to fall off, and/or the amount of calcium in your blood to build up, so your doctor might want to schedule a follow-up appointment after some time has passed to make sure those levels still look okay, and adjust supplements for those variables accordingly.
If you're not going to see a doctor about this, for laziness/poverty/whatever reasons, I think the average risk from not taking Vitamin D is vastly bigger than the risk from taking it.
[0] https://academic.oup.com/ajcn/article/85/1/6/4649294
[1] https://asbmr.onlinelibrary.wiley.com/doi/full/10.1359/jbmr....
400mg = 400000mcg = 16000000ui https://www.azcalculator.com/calc/vitamin-d-mcg-iu-converter...
Yes it's fat soluble. But the amount you would need to take in supplements to cause a problem is enormous. (Every vitamin is different)
You could probably take an entire bottle and you'd be fine.
The patients in this study were being given 10x the RDA, about 20k IU/day.
You can very very easily get 25k IU out in the sun and your body has no issues.
It's safe to take 2000IU/day and make sure to get sun if possible.
Through in the UK the NHS were handing out high doses of Vitamin D like cotton candy last winter.