> There are doctors that are prescribing 5000IU+ daily
What doctors prescribe based on the actual conditions particular patients exhibit (and, at doses that high, often with serum level monitoring) is only distantly related, even in theory, to population-wide recommendations like the RDA.
> I've read lately about multiple papers that propose multiple k of IU per day.
Yeah, so have I, and I personally think (though I’m not an expert in this field) it's likely that the RDA is way too low. But there's a difference between the belief that RDA should be higher and the claim that the RDA has, in fact, been raised. It has not, it's still 600 IU/day.
What doctors prescribe based on the actual conditions particular patients exhibit (and, at doses that high, often with serum level monitoring) is only distantly related, even in theory, to population-wide recommendations like the RDA.
> I've read lately about multiple papers that propose multiple k of IU per day.
Yeah, so have I, and I personally think (though I’m not an expert in this field) it's likely that the RDA is way too low. But there's a difference between the belief that RDA should be higher and the claim that the RDA has, in fact, been raised. It has not, it's still 600 IU/day.