In a double-blind randomized study, 23 competitive triathletes competing in an event consisting of a 500-meter swim, a 20-km bicycle race, and a 5-km run were studied after 4-week supplementation with placebo or 17 mmol/day of magnesium orotate.
References:
Golf, S., Bender, S. & Grüttner, J. On the Significance of Magnesium in Extreme Physical Stress. Cardiovasc Drugs Ther 12 (Suppl 2), 197–202 (1998). https://doi.org/10.1023/A:1007708918683
