Vitamin D is rightly called the sunshine vitamin because the action of sunlight on our skin converts pre-vitamin D into a form our body can use.
Vitamin D is actually a hormone, and does some pretty important jobs for us, not least helping us to use the calcium we eat to keep our bones healthy. Without enough vitamin D, toddlers can develop rickets – this used to be a thing of the past, but in recent years there have been several hundred children treated.
