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Not OP, but with vitamin D the dosage is actually something you can figure out empirically by testing vitamin D levels and taking supplements.

No one who talks about supplementation seems to think a level of 8000 over a long period is necessary to obtain adequate levels.

I think by the same token the recommended supplement level of 600 IU is inadequate to reach a sufficient level. But the paper in question didn’t test their result empirically.

Correct. It's fairly easy to know whether the dosage you are taking is working, since you can check levels. 8000 units is a really high dose, one that I have never had to give. The article suggests that 98% of people require that much to get to normal levels, which is almost laughable.

8000?? EFSA recommends a reference value of 1000 IU. And a tolerable upper intake level of 4000 IU.

FYI, that is the wife/doctor's account you replied to.

dang switched a lot of the comments to her personal username after the fact.