Purple has quietly become the most interesting colour in wellness. Not because of aesthetics — though the visual appeal has clearly played a role in the category's rise — but because of what the colour actually signals. That deep, saturated violet-to-indigo hue is the visible expression of anthocyanins: a class of plant pigments that happen to be among the most powerful antioxidant compounds found in food. The deeper the purple, generally speaking, the richer the concentratio