1: "Fatigue and tiredness could be a sign of low vitamin D levels."

2: "Mood changes, including depression, may indicate a vitamin D deficiency."

3: "A weak immune system can be a sign of inadequate vitamin D."

4: "Bone and back pain might signal low levels of vitamin D in the body."

5: "Hair loss and slow hair growth could be linked to a lack of vitamin D."

6: "Muscle pain and weakness are common symptoms of vitamin D deficiency."

7: "Slow wound healing may indicate low levels of vitamin D in the body."

8: "Increased risk of cardiovascular diseases might be linked to vitamin D insufficiency."

9: "Stay aware of these signs to ensure adequate levels of vitamin D in your body."