Thanks to reader Francis..

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Physical symptoms of vitamin D insufficiency may include aching muscles, painful bones, reduced physical performance, poor sleep, hair loss and slow healing wounds

You may also experience poor sleep, fatigue, dizziness, increased risk of dementia and depression, increasing weight, recurring infections and reduced cognitive functioning

Vitamin D plays a role in nearly every bodily system, including fighting against viral and bacterial illnesses such as colds, flu and COVID-19

The only way to know your serum level is to take a blood test. If you choose to supplement with vitamin D3, it's important to include magnesium and vitamin K2 MK-7 to achieve optimal levels and improve your cognitive and cardiovascular health

Vitamin D regulates the expression of hundreds of genes and is integral to biological functions that affect every bodily system. As you’ll see in this short video, vitamin D insufficiency or deficiency can trigger several generalized symptoms that you may have associated with other health conditions.

It is also called the sunshine vitamin since your skin makes vitamin D when exposed to ultraviolet light from the sun.1 Vitamin D performs many functions within the body, including maintaining adequate levels of calcium and phosphate, essential for normal bone mineralization.2

It helps reduce inflammation, which is necessary for the modulation of cell growth and immune function. Vitamin D also affects genes that help regulate cell differentiation and apoptosis.

The main indicator of your vitamin D level is 25-hydroxyvitamin D (25OHD). Data collected from the National Health and Nutrition Examination Survey in 2005-2006 showed a deficiency prevalence of 41.6% in the U.S. population.3 However, as I discuss later in this article, as many as 80% of people may be deficient in vitamin D.