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What's interesting with Vitamin D supplementation is there doesn't appear to be any strong clinical evidence for its effectiveness unless you're severely defici

What's interesting with Vitamin D supplementation is 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. [1] > In conclusion, supplementation of vitamin D-replete individuals does not generate overall health benefits; however, correction of severe vitamin D deficiency remains essential. Probably would be a lot better off going outside and synthesizing your own. Spending time in nature and in the sun does a lot of other useful things - for instance UV exposure induces nitric oxide synthesis too, which lowers blood pressure. [2] [1] https://www.nature.com/articles/s41574-021-00593-z https://www.nature.com/articles/s41574-021-00593-z [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5593895/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5593895/

kypro 3y ago
> 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.
- arcticbull 3y ago
  > 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. I think we're basically in agreement.

kypro 3y ago

> 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.

arcticbull 3y ago
> 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. I think we're basically in agreement.