I'd trust EPIC series more, even though it's not RCD. They showed J-curve for all cause mortality and morbidity with best inflection point around 1500-2000 IU.

I'd trust EPIC series more, even though it's not RCD. They showed J-curve for all cause mortality and morbidity with best inflection point around 1500-2000 IU. The curve is somewhat flat above this. One of the findings (there's a summary somewhere): https://epic.iarc.fr/highlights/vitamindcolorectal.php https://epic.iarc.fr/highlights/vitamindcolorectal.php