Vitamin D is necessary for the regulation of calcium and phosphorus minerals in the body. It also plays an important role in maintaining proper bone structure.

Sun exposure is an easy and reliable way for most people to get vitamin D. During periods of intense sunlight, vitamin D is stored in oil and then released during winter periods when sunlight is less. However, today people are at risk of vitamin D deficiency. They may have more trouble converting vitamin D into a beneficial form due to less time spent in the sun, reduced receptors that convert sunlight to vitamin D on the skin, less dietary vitamin D intake, or reduced absorption.

Vitamin D deficiency is more common than expected. People who don't get enough sun are particularly at risk, especially those living in Canada and the northern half of the United States. However, vitamin D deficiency is also common in people living in climates with intense sunlight, due to reasons such as indoor work environments and sunscreen use.
People living in northern latitudes or with dark skin, people who cannot sunbathe or work indoors, people who wear closed clothes, those who use high-factor protective sunscreen, women who are pregnant or breastfeeding, the elderly, kidney and liver patients, celiac patients are at risk for vitamin D deficiency.
Symptoms seen in vitamin D deficiency: general body pain, bone aches, joint aches, fatigue, depression, headaches, insomnia, bruises under the eyes, numbness, difficulty losing weight, chills, hair loss, etc.

What should be the vitamin D level?

Excessively Low Vitamin D Level: Below 30 ng / mL
Slightly Low Vitamin D Level: Between 30 ng / mL and 39 nmol
Normal Vitamin D Level: Between 40 ng / mL and 100 nmol / L
High Vitamin D Level: higher than 150 ng / mL
The daily dose should be determined by the doctor and can be reduced or increased as needed.