What are the signs you are vitamin D deficient?

Common signs of vitamin D deficiency include fatigue and low energy, bone pain or achiness, muscle weakness, and frequent illness or infections due to a weakened immune system. You might also experience depression or low mood, since vitamin D plays a role in serotonin production. Hair loss, slow wound healing, and back pain are also associated with deficiency. Many people have no obvious symptoms at all, which is why it often goes undetected. Those at higher risk include people who spend little time outdoors, have darker skin, are older, or live in northern climates with limited sunlight. A simple blood test from your doctor is the most reliable way to confirm whether you are deficient.