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Vitamin D

Written By Dr. Cammie on April 22, 2020

Vitamin D


Vitamin D is vital for our bodies to absorb calcium and promote bone growth. Too little vitamin D results in soft bones in children (rickets) and fragile, misshapen bones in adults (osteomalacia). Vitamin D also plays a key role for other important body functions.  

Studies show that people with higher levels of vitamin D have a lower risk of disease, although they do not definitively prove that lack of vitamin D causes disease -- or that vitamin D supplements would lower risk. 

The only proven benefit of vitamin D is the role of helping our bodies absorb calcium in order to build strong bones, but that's far from the whole story. Vitamin D supports regulation of the immune and neuromuscular systems, as well as playing a major role in the life cycle of human cells. 

Research has shown that vitamin D might play an important role in regulating mood and warding off depression. In one study, scientists found that people with depression who received vitamin D supplements noticed an improvement in their symptoms. 

In another study of people with fibromyalgia, researchers found vitamin D deficiency was more common in those who were also experiencing anxiety and depression. 

Vitamin D is so important that your body makes it by itself -- but only after skin exposure to sufficient sunlight. This is a problem for people in northern climates. In the U.S., only people who live south of a line drawn from Los Angeles to Columbia, S.C., get enough sunlight for vitamin D production throughout the year. 

Dark skin absorbs less sunlight, so people with dark skin do not get as much vitamin D from sun exposure as do light-skinned people. This is a particular problem for African-Americans in the northern U.S. 


Signs of Deficiency: 

Many factors can affect your ability to get sufficient amounts of vitamin D through the sun alone. These factors include: 

  • Being in an area with high pollution 
  • Using sunscreen 
  • Spending more time indoors 
  • Living in big cities where buildings block sunlight 
  • Having darker skin. (The higher the levels of melanin, the less vitamin D the skin can absorb.) 

These factors contribute to vitamin D deficiency in an increasing number of people. That’s why it’s important to get some of your vitamin D from sources besides sunlight. 

The symptoms of a vitamin D deficiency in adults include: 

Doctors can diagnose a vitamin D deficiency by performing a simple blood test. If you have a deficiency, your doctor may order X-rays to check the strength of your bones. 

If you’re diagnosed with a vitamin D deficiency, your doctor will likely recommend you take daily vitamin D supplements. If you have a severe deficiency, they may instead recommend high-dose vitamin D tablets or liquids. You should also make sure to get vitamin D through sunlight and the foods you eat. 


Few foods contain vitamin D naturally. Because of this, some foods are fortified. This means that vitamin D has been added. Foods that contain vitamin D include: 

  • salmon 
  • sardines 
  • egg yolk 
  • shrimp 
  • milk (fortified) 
  • cereal (fortified) 
  • yogurt (fortified) 
  • orange juice (fortified) 

It can be hard to get enough vitamin D each day through sun exposure and food alone, so taking vitamin D supplements can help with the recommended daily amount of vitamin D suggested. 

Vitamin D3 from Healthy Lifestyles can help you get what you need.