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60-80? That seems high - I don't think you could be at that without taking a lot of supplements every day.

I think 30 is the lab normal (and it was recently raised to 30 from 20) - though a lot of people are below that when tested.

Recent research (as in the last 10 years) seems to suggest that current RDI is at least an order of magnitude lower than it should be. I have no medical background, but anecdotally, it has helped my sleep a lot. I'm generally a supplement skeptic, but currently taking 6k IU a day.

There's no guarantee that the optimum Vitamin D level is one that the skin can synthesize under even optimal conditions.

It might be. But it could also be more.

Sure - I’m just skeptical that the optimal level is one you could never get without a lot of supplements.

Doesn’t mean that isn’t true, but I’d need more to be persuaded.

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