As we settle into a new year, many of us are focusing on healthier routines, better energy, and stronger immunity. One simple nutrient plays a surprisingly powerful role in all of these areas: vitamin D.

Your immune system does far more than fight off bugs and viruses. It's your body's frontline defence, working constantly behind the scenes to detect and neutralise threats, repair damage, and keep you well. But like any system, it needs the right support to function at its best.