Then don’t take high dose vitamin D without doing research and due diligence first. In fact, you shouldn’t take high dose D for a couple years AFTER you’ve reversed you t2d! Yes, vitamin D helps in the cancer department, but you don’t need to take an insane amount of it in my honest opinion. During the colder seasons, especially winter, I personally take more vitamin D, but not a crazy amount. Otherwise I’m outside getting a nice tan (I usually take 6mg of astaxanthin a day for a couple weeks before knowingly going out in the sun so I don’t burn). Magnesium, copper (along with vitamin B6 and taurine helps absorb both magnesium, iron, and a plethora or other vitamins, amino acids, and minerals) and thiamine (or benfotiamine) are key to reversing t2d along with a healthy, none junk food diet. High dose vitamin D depletes magnesium, so it shouldn’t be attempted by t2d folk until 2 years after the conditions have been reversed.