Vitamin D3

Locomotor apparatus

It helps body to ingest calcium (one of the basic building blocks of bones) from food and supplements. People who get too little vitamin D can develop soft, thin and brittle bones - a condition known as rickets in children and osteomalacia in adults.

Nervous system

Nerves need it to transmit messages between the brain and every part of the body.

Immunity

The immune system needs vitamin D to fight the invasion of bacteria and viruses.

Adults require about 600 IU per day, and after 70 years old 800 IU.