One of the foundational studies on vitamin D came out of the U.S. in 2007. We've been following the literature on vitamin D for many chronic diseases, but in our case specifically with regard to cancer care over the last seven or eight years. We recommend it not only for the prevention of cancer in a cancer patient's families and friends and community, but also for the cancer patients themselves. We're currently conducting an in-house trial as well on vitamin D and stage 4 colorectal cancer. There's very promising news about vitamin D and its role in cancer prevention and secondary prevention.
On March 12th, 2015. See this statement in context.