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edic committee. In Saudi Arabia, the level of meaningful clinical research and publications by orthopedic residents is still low. The results of this study should be taken into consideration before the implementation of the new promotion criteria in the centers under the umbrella of Saudi orthopedic committee. It is suggested that vitamin D may have a beneficial role in male reproduction. The male reproductive system is a target tissue for vitamin D. This study will aim to evaluate the effects of vitamin D supplementation on sperm param