These studies have no value. There is basically no legitimate insight on things in medicine that kind of work (you need very stringent measures for lack of bia

These studies have no value. There is basically no legitimate insight on things in medicine that kind of work (you need very stringent measures for lack of bias, huge varied cohorts, lots of studies, major controls, etc.) so, to this day, most studies on supplements/vitamins are low quality and highly inconclusive. Things that have a huge effect are much easier to study, but that type of fruit is mostly picked by pharmaceutical companies and patented. After years, many, many, many studies, billions of dollars, huge cohorts, lots of analysis, the medical industry can say that vitamin d supplements maybe possibly are helpful for some things but could also be harmful, but probably aren't, but also probably don't help unless you're very deficient. https://www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792 https://www.mayoclinic.org/drugs-supplements-vitamin-d/art-2... When you start talking about other supplements, you go into crazy-world. It's not even clear that most pharmaceuticals do anything unless the effect size is very significant.