Vitamin D is an extremely important vitamin that supports bone development and maintenance, the proper functioning of the immune system, and the body's absorption of calcium.

Unfortunately, this nutrient exists in precious few food sources. The body produces around 90 per cent of its vitamin D supply from direct sunlight.

It may, however, be necessary to take a vitamin D supplement even during the summer.

Read on to find out more about the importance of vitamin D, and why Brits may need to supplement even during the summer.