Wellness

5 Signs You May Be Vitamin D Deficient

By Dr. Michael Torres·December 28, 2025·6 min read
5 Signs You May Be Vitamin D Deficient

Often called the "sunshine vitamin," Vitamin D is essential for bone health, immune function, and mood regulation. Yet studies suggest that up to 42% of American adults are deficient. Here are five signs that you might need more Vitamin D.

1. Fatigue and Tiredness

Feeling constantly tired despite adequate sleep can be a sign of Vitamin D deficiency. This vitamin plays a crucial role in energy production at the cellular level.

2. Bone and Back Pain

Vitamin D helps your body absorb calcium. Without enough of it, you may experience aching bones, particularly in your lower back, hips, and legs.

3. Frequent Illness

If you seem to catch every cold going around, low Vitamin D levels could be compromising your immune system. This vitamin is crucial for proper immune cell function.

4. Mood Changes

Research has linked Vitamin D deficiency to depression and seasonal affective disorder (SAD). The vitamin plays a role in serotonin production, our "feel-good" neurotransmitter.

5. Slow Wound Healing

If cuts and bruises seem to take forever to heal, inadequate Vitamin D may be slowing down your body's repair processes.

What You Can Do

Talk to your healthcare provider about testing your Vitamin D levels. If deficient, a high-quality Vitamin D3 supplement, ideally paired with K2 for optimal absorption, can help restore healthy levels.