Meaning of Vitamin D:
Vitamin D helps your body absorb calcium.
Calcium is one of the main building blocks of bone. A lack of vitamin D can lead to bone diseases such as osteoporosis or rickets. Vitamin D also has a role in your nerve, muscle, and immune systems.
Ways to get vitamin D:
Through your skin (from sunlight): Your body forms vitamin D naturally after exposure to sunlight. However, too much sun exposure can lead to skin aging and skin cancer, so many people try to get their vitamin D from other sources.
From your diet: Vitamin D-rich foods include egg yolks, saltwater fish, and liver. Some other foods, like milk and cereal, often have added vitamin D.
From supplements: You can also take vitamin D supplements. Check with your health care provider to see how much you should take.