17 Dec 2015 Blackmores Institute Low levels of vitamin d may increase risk of stress fractures in active individuals 17 Dec 2015 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News Active individuals who participate in higher impact activities may need to maintain higher vitamin D levels to reduce their risk of stress fractures, according to orthopaedic experts. Investigators tested the serum concentration of 25(OH)D, in patients with confirmed stress fractures. × To continue reading this article, please Log In or Sign Up for access.