Armin, Frohnauer, Schwanke Maike, Kulow Wolfgang, Kohler Gotz, and Knechtle Beat. “No Effect of Pre Race Supplementation With Vitamins and Minerals on Performance in an Ultra-Endurance Race”. Pakistan Journal of Nutrition 7, no. 2 (February 15, 2008): 283–286. Accessed August 23, 2025. https://pjnonline.org/pjn/article/view/633.