Vitamin d deficiency: time for inaction?

In 1998, the British Medical Journal boldly stated in an editorial headline, "Vitamin D Deficiency: Time for Action."(1) The urgency was clear: vitamin D deficiency was going undiagnosed and untreated in large numbers of people. Patients were at risk and suffering needlessly. A simple, extremely low-cost, low-toxicity intervention was readily available. All that was required was vitamin D advocacy.