New (to me) Data on Vitamin D

Dr. Reinhold Vieth is Professor in the Department of Nutritional Sciences, and the Department of Laboratory Medicine and Pathology, University of Toronto. He is an internationally recognized expert on the clinical effectiveness of vitamin D as well as its pharmacology and safety. There is a great video of him giving a talk at the vitamin D Association Experts Forum in 2011 here:
https://www.youtube.com/watch?v=MIDWA9-cGdY#!
If you do not have 45 minutes to look at it, here are the main points I took away from his presentation:
1. Blood levels of 25(OH)D are 75-225 nmo/g are normal. These levels are safe and optimal because we were “designed” for this by the process of evolution.
2. There were NO reported incidents of toxicity until intake was more than 40,000 IU per day.
3. The upper level of recommended vitamin dosage are those that any member of the public can take without doctor’s supervision and be guaranteed that they are not going to generate a negative reaction.
4. Once a year doses of vitamin D are destructive. Large fluctuations in Vitamin D levels are associated with increased risk of falls and fractures. In fact, the greater the fluctuation of your vitamin D level, the greater the risk for some cancers. So if you do not supplement all year, at least do so in winter.
5. The simple guideline to remember is that your body will make vitamin D from sunshine when your shadow is shorter than your height.
6. Vitamin D has a half life in the body of 60 days.
7. Dr. Vieth spoke on the unworkably low levels of Vitamin D being recommended by the IOM (Institute Of Medicine) as a reaction to a simplistic assessment of potential risks and an unwillingness to look at sophisticated models to identify causes of those risks.
“I am on a group from the American Geriatric Society which has a similar problem. You go to all the trouble reviewing the medicine and evidence, come up with advice, you put it out for review, out comes the IOM which something different, then doctors being driven by things that are set for a different purpose than patient care.”