Hi,
I received this from a long time friend in Australia. There are 2 links. One is to Dr Mercola's site and the other is an interview with another doctor in California.
The vitamin they are talking about is D3 and there are 3 ways of getting this nutrient: Regular sunshine, an in home lighting system or oral sublingual mouth spray.
http://www.grassrootshealth.net/
http://www.mercola.com/article/vitamin-d-resources.htm
For anyone deaing with cancer or a loved one who is this may be useful in their recovery program and also anyone's preventive program.
lightwalker