.....However, The Lancet, the world’s best-known medical journal, recently suggested in an editorial that most of the benefits of vitamin D advanced by scientific studies are a “myth.” It says people tend to have low vitamin D when they are ill because they do not go outdoors very much.
Most of The Lancet’s trials have used low doses of vitamin DThis was also the view presented in papers published in The Lancet by two teams, Philippe Autier of the International Prevention Research Institute, Lyon, and Mark Bolland of the Department of Medicine, University of Auckland.
They argue that clinical trials of vitamin D have failed to show any clear benefit. However, most of the trials have used low doses of the vitamin. Professor Michael Holick, pioneer of vitamin D research at Boston University, says 4,000 units per day is required to give an optimum level of the vitamin in the blood, enough to prevent disease. A number of clinical trials relied on by The Lancet editorial and its authors used a daily dose of just 400 units.....