Vitamin D is an essential nutrient that plays a crucial role in many bodily functions, including bone health, immune system function, and mood regulation. Unfortunately, many people are deficient in this vital nutrient, which can lead to a variety of health problems. In this article, we’ll explore the six warning signs that you may be lacking vitamin D, and discuss some tips for getting enough of this crucial nutrient. 1. Fatigue and Weakness One of the most common signs of vitamin D deficiency is fatigue and weakness. Vitamin D plays a key role in energy production, and a lack of