Disease Prevention

Vitamin D Deficiency: 7 Signs You're Low and What to Do

Vitamin D affects immunity, mood, bone density and heart health. Up to 42% of adults are deficient — and most don't know it.

Dr. Maya Reyes, MDMay 6, 20269 min read
Sunlight streaming through a window onto a vitamin D bottle

Vitamin D acts more like a hormone than a vitamin, with receptors on virtually every cell. Deficiency is silent — and shockingly common.

Supporting health image Small daily habits compound into transformative results.

7 Signs You Might Be Low

Fatigue, frequent infections, low mood, bone or muscle pain, hair loss, slow wound healing, brain fog.

Who Is at Risk

Indoor workers, people with darker skin, those over 65, anyone living above 35° latitude, people with malabsorption disorders.

Get Tested

Ask for a 25-hydroxy vitamin D blood test. Target range: 30–60 ng/mL.

How to Correct It

Sun (10–20 min midday exposure several times a week), fatty fish, fortified foods. Most adults need 1,000–2,000 IU/day of D3 supplement to maintain levels.

Key Takeaways

  • Deficiency is common and silent.
  • Test, don't guess.
  • Aim for 30–60 ng/mL.
  • D3 + sunlight + food.

Frequently Asked Questions

Can I get enough from food alone?

Rarely — fortified foods rarely provide enough.

Is more better?

No — chronic high doses can cause hypercalcemia.

D2 or D3?

D3 is significantly more effective.

Conclusion

Small, evidence-based changes — practiced consistently — outperform every fad. Bookmark this guide, share it with someone you care about, and explore more on Vital Pulse.

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