Rimsha Azhar, Mian Asif Mujtaba, Saira Bashir, Hina Azeez, Rao Muhammad Kaleem Furqan and Ibadullah Salarzai (2026) “Vitamin D Deficiency and Its Association with Fatigue and Cognitive Performance in Adults”, International Journal of Pharmacy Research & Technology (IJPRT), 16(2), pp. 4189–4199. Available at: https://ijprt.org/index.php/pub/article/view/2997 (Accessed: 1 October 2026).