
This reprint is about vitamin D, a molecule that can be absorbed from certain foods, such as fatty fish, which can also be produced endogenously when we expose our skin to sufficient doses of ultraviolet B radiation. When vitamin D is metabolized into 1,25(OH)2D3 (also called calcitriol), it acts as a high-affinity ligand for the transcription factor VDR, i.e., it has direct effects on gene reg…