> there doesn't appear to be any strong clinical evidence for its effectiveness unless you're severely deficient and on the road to rickets.
> So long as your serum 25OHD concentration is >50nmol/L according to this meta analysis, there's no clear effects.
I mostly agree. Above 50nmol/L it's not so important, but most evidence would still point towards it being slightly healthier to be on the higher end of the reference range for Vit D, so therefore if you wanted to optimise your health you probably should be targeting around ~150nmol/L. We know our ancestors would have had Vit D concentrations around these levels so there's no good reason to think it would be unhealthy either.
Additionally, and what you missed here is that a lot of people in the northern hemisphere get close or fall below that 50nmol/L clinically deficient level during winter months. This is why I think in general it's probably better for people to take a low dose of Vit D than not (especially during the winter).
But to your point, if you're spending time outside and getting a bit of sun exposure every day then it's probably not needed.
> We know our ancestors would have had Vit D concentrations around these levels so there's no good reason to think it would be unhealthy either.
Yeah, I certainly don't think it's unhealthy, I just haven't seen any studies demonstrate really any effect at all over the lowest normal value. If you have some studies I'd love to see them so I can cite them in the future.
> So long as your serum 25OHD concentration is >50nmol/L according to this meta analysis, there's no clear effects.
I mostly agree. Above 50nmol/L it's not so important, but most evidence would still point towards it being slightly healthier to be on the higher end of the reference range for Vit D, so therefore if you wanted to optimise your health you probably should be targeting around ~150nmol/L. We know our ancestors would have had Vit D concentrations around these levels so there's no good reason to think it would be unhealthy either.
Additionally, and what you missed here is that a lot of people in the northern hemisphere get close or fall below that 50nmol/L clinically deficient level during winter months. This is why I think in general it's probably better for people to take a low dose of Vit D than not (especially during the winter).
But to your point, if you're spending time outside and getting a bit of sun exposure every day then it's probably not needed.