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Vitamin D Calculator

Calculate your vitamin D requirements and assess deficiency levels for optimal bone health

Calculate Your Vitamin D Requirements

Additional Factors

Risk factors: limited sun exposure, dark skin, high BMI, malabsorption, certain medications

Vitamin D Serum Level (Optional)

Vitamin D Recommendations

600-1500
IU per day
(15-37.5 mcg/day)
10-15
Minutes sun exposure
Midday, depending on season

Serum 25(OH)D Reference Ranges

Deficient:< 20 ng/ml (< 50 nmol/L)
Insufficient:20-29 ng/ml (50-72.5 nmol/L)
Sufficient:30-50 ng/ml (75-125 nmol/L)
High:> 50 ng/ml (> 125 nmol/L)

Health Recommendations

💡 Get regular blood tests to monitor your vitamin D status, especially if taking supplements.
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Age-Based RDI (IU/day)

Infants (0-12 months)
400-1000 IU
Children (1-18 years)
600-1000 IU
Adults (19-70 years)
600-1500 IU
Adults (70+ years)
800-2000 IU
Pregnancy/Breastfeeding
600-2000 IU

Natural Sources

☀️
Sun Exposure
10-30 minutes midday
🐟
Fatty Fish
Salmon, mackerel, sardines
🥛
Fortified Foods
Milk, cereals, orange juice
💊
Supplements
D2 or D3 forms

Vitamin D Tips

Essential for bone health and immune function

Take with fat-containing meals for better absorption

Vitamin D3 is more effective than D2

Regular testing helps optimize levels

Understanding Vitamin D

What is Vitamin D?

Vitamin D is a fat-soluble vitamin that's unique because your body can produce it when your skin is exposed to sunlight. It exists in two main forms: D2 (ergocalciferol) from plants and D3 (cholecalciferol) from animals and sun exposure.

Health Benefits

  • Promotes calcium absorption for strong bones
  • Supports immune system function
  • Helps regulate mood and reduce depression
  • May reduce risk of multiple sclerosis and heart disease

Deficiency Risks

Children

Rickets, delayed growth, increased infection risk

Adults

Osteomalacia, bone pain, muscle weakness, increased fracture risk

Risk Factors for Deficiency

  • • Limited sun exposure
  • • Dark skin pigmentation
  • • Advanced age
  • • Obesity (BMI > 30)
  • • Malabsorption disorders
  • • Certain medications

⚠️ Medical Disclaimer

This calculator provides general recommendations based on established guidelines. It cannot replace professional medical advice, diagnosis, or treatment. Individual vitamin D needs may vary based on health conditions, medications, geographic location, and other factors. Always consult with a healthcare provider before starting supplements, especially if you have medical conditions or take medications. Regular blood testing is recommended to monitor vitamin D status.

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