Vitamin D has two forms: vitamin D2 (ergocalciferol) derived from plant-based sources and vitamin D3 (cholecalciferol) found in some fish and meat and produced by your body when exposed to sunlight.

The successor to the much-loved first-generation Alpina D3, which was based on the ‘E90’ BMW 3-series – and also (according to its maker) the fastest diesel-powered production car in the world.