Raw LLM Responses

1. Vitamin D levels are measurable, so ask for that test when you get your physical 2. the optimal level was determined by Dr. Cannell who took blood level tests from people living at the equator, approx. 50 ngml. The current test says 30-100 is normal/acceptable, so shoot for 50. 3. the best source is sunlight, but that means you cannot slather yourself with sunscreen and need to spend some time outside in the summer. 4. you cannot possibly keep a normal level in the winter if you live where it is cold, both because it is too cold to expose your skin for a long time outside, and also the less direct rays of the sun are not going to help you produce that vitamin d. 5. I have been supplementing with D for a while (after finding out about Dr. Cannell). When I first asked my doctor years ago to do a D test it wasn't a common request, and she nearly fell out of her chair when I told her I was taking 2,000 units a day (the USDA is 400 IU). My tested level at that time was 37 ngml, so low normal. 6. The reality is that most doctors are very good at recognizing pathology, but not at preventative measures like supplementation. The majority of physicians have never taken a single course in nutrition or exercise science or anything related to being healthy, they focus on recognizing sickness when it becomes advanced, and treating it at that stage. So don't expect great guidance from your doctor, unless they are one of the few who make it their lives work (Dr Cannell, Mercola, etc) to try and understand how to be healthy via lifestyle, diet, and exercise. sources: this is the physician who made studying vitamin D his life work, so go to the source. I personally supplement with 5000 IUD D3/k2 which is a combination that helps move free calcium into bone, and out of your arteries. ​ [https://www.vitamindcouncil.org/author/dr-john-cannell/#.XBeahy2ZPow](https://www.vitamindcouncil.org/author/dr-john-cannell/#.XBeahy2ZPow) ​ ​