A low-cost Vitamin D blood test was FDA approved in 2011, and since then Vitamin D deficiency diagnoses have skyrocketed. Plus, the narrative works (humans need

A low-cost Vitamin D blood test was FDA approved in 2011, and since then Vitamin D deficiency diagnoses have skyrocketed. Plus, the narrative works (humans need sun for vitamin D, but now humans are inside, thus humans need to supplement D).