yes, and the opposite is true. if more and more studies just appear out of thin air touting a supplement, you can bet there is something not quite kosher going on. with vit d it is actually quite simple. the "deficiency" is just a symptom of other problems, masked via supplementation. the hook is that it slowly disables your immune system. surprise. by the time people catch on to this, the damage is long done.
and, just to avoid the reactions I usually get, one clarification. I do not advocate the marshall protocol. I do believe that he and his colleages are correct about their conclusions regarding the negative impact of supplementing vitamin d, as well as the true mechanism behind the seeming deficiency that would have the entire world supplementing with vitamin d. wake up people, you are being fooled.