Discover the most effective ways to boost your vitamin D levels and prevent vitamin D deficiency . Vitamin D is a fat-soluble vitamin that plays a vital role in many bodily processes. Vitamin D deficiency can occur due to less sun exposure, dark skin, physical blocking of sun rays, diet lacking Vitamin D, obesity, and certain conditions and medications that interfere with Vitamin D absorption. Symptoms of Vitamin D deficiency may not occur for several months or years. Some of the common symptoms may include fatigue and tiredness, bone and muscle pain, loss of appetite, hair loss. This ... Dr. Eric Berg, a chiropractor and nutrition expert, explained in a YouTube video how vitamin D deficiency can cause a wide range of unexpected symptoms beyond common ones like fatigue and bone pain. He highlighted 11 lesser-known signs. Berg also emphasized that many people may appear healthy in tests yet still be deficient at the cellular level, and advised supplementing with vitamin D3 along with nutrients like magnesium, vitamin K2, zinc, and B6 for best results. A lack of vitamin D ( deficiency ) can affect your bones and overall health. Learn who is at risk, how much vitamin D you need, and how to get enough.