Looks like vitamin D has been d-listed by scientists yet again, with new recommended dietary allowance (RDA) guidelines halving vitamin D intake from 800 international units (IU) per day to a paltry 400 IU. This, following conclusions made by the Endocrine Society after using a “gold standard for measuring 25(OH)D.” These findings were presented at the ENDO 2017 conference last April. Principal...