Vitamin D for Cushing's Syndrome
Vitamin D has no role in reducing cortisol in Cushing's syndrome, and any product marketed that way is misleading. Its genuine role is protective: glucocorticoid excess causes rapid bone loss by suppressing bone formation, increasing resorption, and reducing intestinal calcium absorption — and vitamin D with calcium is standard supportive care in steroid-related bone disease. Guidelines for glucocorticoid-induced osteoporosis recommend calcium and vitamin D for essentially everyone on sustained steroid therapy, with bisphosphonates added for those at higher fracture risk. This is a bone-protection intervention running alongside definitive treatment, not a treatment for the syndrome.
Overview
How It Works
Dosing & Protocol
Supportive dosing during cortisol excess
| Component | Dose | Notes |
|---|---|---|
| Vitamin D3 | 800-2,000 IU daily | Titrate to 25-OH vitamin D; standard in steroid-bone guidelines |
| Calcium | 1,000-1,200 mg/day total | Food first; supplement the gap |
| Bisphosphonate or other bone therapy | Prescribed by clinician | Added for most patients at meaningful fracture risk |
Evidence
Bisphosphonates for steroid-induced osteoporosis
Allen CS, Yeung JH, Vandermeer B
Bisphosphonates, with calcium and vitamin D, increase bone mineral density and reduce vertebral fractures in patients receiving glucocorticoids.
Safety
Interactions & Conflicts
Interactions to know
| Interacts with | Severity | Mechanism | Action |
|---|---|---|---|
| — | — | ||
| — | — | ||
| — | — | ||
| — | — |
References
Frequently Asked Questions
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.