Vitamin D is an extremely important vitamin that has powerful effects on several systems throughout the body. Unlike most vitamins, vitamin D actually functions like a hormone, and every single cell in your body has a receptor for it. Your body makes it from cholesterol when your skin is exposed to sunlight. It’s also found in certain foods such as fatty fish and fortified dairy products, although it’s very difficult to get enough from diet alone. Vitamin D deficiency is very common. It’s estimated that about 1 billion people worldwide have low levels of the vitamin in their blood
1. Excessive sweating
It’s often difficult to tell if newborns are deficient, but a sweaty forehead is one of the first noticeable symptoms. The same rings true for adults, so if you’re “glowing” while your activity level remains steady, your temperature is close to 98.6° and you’re in a moderate temperature environment, you may want to consider a vitamin D test.