I wish this was true but I and other family members had rock bottom low vitamin D levels in lab tests. We supplemented until it rose to normal levels. None of u

I wish this was true but I and other family members had rock bottom low vitamin D levels in lab tests. We supplemented until it rose to normal levels. None of us noticed any perceptible difference. Suppodedly this will prevent problems but it doesn't feel like anything has been fixed. I wonder how much is placebo.