The Best Years in Life) For the same reason that the conventional energy industry has not harnessed the full potential of solar energy (its free!), sunlight and its indispensable byproduct in our skin: vitamin D, represents a serious threat to the medical establishment, whose questionable and aggressive promotion of vaccination and drug-based strategies in place of inexpensive, safe and effective vitamin D supplementation (or better, carefully meted out recreation and sunlight exposure) for immunity, has many questioning their motives. Read More.