Alopecia areata (AA) is a distressing T-cell-mediated autoimmune disorder causing patchy hair loss. Recent research conducted in North India explores the vital relationship between vitamin D and alopecia areata. Given that vitamin D acts as a potent immunomodulator, its role in the pathogenesis of autoimmune conditions is increasingly recognized. Physicians often encounter patients with varying degrees of hair loss severity, making these findings highly relevant for clinical practice.

The hospital-based case-control study involved 44 patients with alopecia areata and 44 healthy matched controls. Researchers utilized the Severity of Alopecia Tool (SALT) score to determine disease severity. Meanwhile, researchers measured serum 25-hydroxyvitamin D [25(OH)D] levels using Chemiluminescence Immunoassay (CLIA). The results revealed a stark contrast between the two groups.

Impact of Vitamin D and Alopecia Areata on SALT Scores

Patients showed significantly lower median serum 25(OH)D levels (17.10 ng/mL) compared to healthy controls (22.60 ng/mL). Furthermore, 68.18% of patients had vitamin D deficiency, whereas only 31.81% of controls were deficient. Notably, the study established a significant negative correlation (r = -0.505, p = 0.001) between vitamin D levels and the SALT score. This suggests that as vitamin D levels drop, the severity of hair loss tends to increase.

Additionally, patients with chronic or recurrent alopecia areata exhibited even lower vitamin D levels than those with their first episode. However, gender did not significantly influence these levels. Consequently, screening for vitamin D deficiency in patients presenting with alopecia areata could be a beneficial addition to standard care. Therefore, clinicians might consider supplementation as a potential supportive therapy to improve outcomes in these patients.

Frequently Asked Questions

How does vitamin D influence hair follicles in alopecia areata?

Hair follicles express vitamin D receptors and these receptors play a crucial role in the hair cycle. Low vitamin D levels may impair the immune privilege of the follicle, contributing to autoimmune destruction.

Should all patients with alopecia areata be screened for vitamin D deficiency?

While further research is needed, this study suggests a strong correlation between deficiency and disease severity. Screening may help identify patients who could benefit from supplementation as an adjunct therapy.

Disclaimer: This content is for informational and educational purposes only. It does not constitute 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. Refer to the latest local and national guidelines for clinical practice.

References

Garg S et al. Assessment of vitamin D levels in patients with alopecia areata: a case-control study in a Tertiary Care Hospital in North India. Ann Med. 2026 Dec undefined. doi: 10.1080/07853890.2026.2662780. PMID: 42035405.

Gade VK et al. Investigation of Serum Vitamin D Levels in Patients with Alopecia Areata. Indian Dermatol Online J. 2017;8(5):347-350.

Bhat YJ et al. Vitamin D level in alopecia areata. Indian J Dermatol. 2017;62(4):407-410.