An essential micronutrient
Vitamin D helps to allow your body to absorb phosphate and calcium. These are essential in the human body. Your body uses it to build up strong bones. Without vitamin d, your bones will be weak and flexible. It can cause osteoperosis, which is very brittle bones. It can also cause rickets.
Where does it come from?
90% of your vitamin d comes from the sun. You can also get a small part of vitamin d from egg yolks and some fish.