Štrbac, T., Stojić, V., Frkanec, S. and Stanimirović, A. 2025. Future Challenges of Vitamin D Deficiency: The Impact of Systemic Vitamin D Therapy on Serum Levels and Skin Diseases. Journal of Applied Cosmetology. 43, 2 (Jun. 2025), 47–54. DOI:https://doi.org/10.56609/jac.v43i2.492.