Khan, S.J. et al. 2025. Effectiveness of Calcium and Vitamin D, With and Without Collagen Peptide, in Enhancing Bone Mineral Density on Postmenopausal Women with Osteopenia: A Randomized Controlled Trial: Role of Calcium and Vitamin D in Bone Mineral Density on Postmenopausal Women with Osteopenia. Annals of Punjab Medical College. 19, 1 (Mar. 2025), 62–66. DOI:https://doi.org/10.29054/apmc/2025.1732.