Vitamin D supplementation improves hair growth in people with hair loss.

Is it true that vitamin D supplementation improves hair growth in people with hair loss?

Partly. Evidence on vitamin D and hair growth is partial and mixed: a Cleveland Clinic dermatologist says vitamin D may help hair growth in deficiency or alopecia areata, a 2018 review says the role is plausible but still needs large trials, a rabbit study found increased hair length and follicle density, and a community-service article asserts benefit for the elderly. Against this, a single case report found hair loss in vitamin D-dependent rickets type 2A did not improve with vitamin D supplementation.

Verdict: CONTESTED PARTIAL · 4 sources for, 1 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

7 Vitamins and Supplements for Hair Growth. (n.d.). health.clevelandclinic.org. https://health.clevelandclinic.org/the-best-vitamins-supplements-and-products-for-healthier-hair

Effect of calcium supplementation on bone deformity and histopathological findings of skin papules in a pediatric patient with vitamin D–dependent rickets type 2A: A case report. (n.d.). cir.nii.ac.jp. https://doi.org/10.1297/cpe.2024-0079

Almohanna, H. M., Ahmed, A. A., Tsatalis, J., & Tosti, A. (2018). The Role of Vitamins and Minerals in Hair Loss: A Review. doi.org. https://doi.org/10.1007/s13555-018-0278-6

Dietary Vitamin D Supplementation Improves Hair Follicle Development and Affects Fatty Acid Metabolism in Rex Rabbits. (2025). doi.org. https://doi.org/10.1002/fsn3.70675

Moniaga, C. S., Sugiharto, H., Febriastuti, A., Gunaidi, F. C., Destra, E., & Firmansyah, Y. (2024). Program Edukasi Masyarakat Dengan Edukasi Beserta Skrining Kadar Vitamin D Untuk Kesehatan Rambut Pada Lanjut Usia. doi.org. https://doi.org/10.59841/jurai.v2i2.1396