In 269,229 senior UK Biobank participants, those who used vitamin D supplements and those with high blood concentrations were less likely to have dementia.
While the study didn't include calcium supplementation, it was nonetheless "striking" that vitamin D alone made no difference, according to the authors.
However, meta-analysis concluded supplementation with vitamins C, D, or zinc was not associated with mortality benefit among hospitalized COVID-19 patients.
Obesity may heighten the likelihood of both vitamin D deficiency and insulin resistance through the same inflammatory pathway, researchers in Brazil found.
Type 2 diabetes patients taking 500 mg/day of delta-tocotrienol for 24 weeks saw improved glycemic control along with reduced inflammation and oxidative stress.
While the topic is hotly debated, large-scale associations between higher vitamin D concentrations and less severe COVID-19 outcomes are still being found.