
What are the essential biomarkers runners should track? The numbers that flag fatigue, overtraining, and low testosterone
For male runners, the essential biomarker list starts with ferritin and iron studies, vitamin D, glucose, and a hormone panel that includes total testosterone, free testosterone, LH, and FSH, because a testosterone value below 350 ng/dL total or 100 pg/mL free only matters when symptoms persist and the pituitary signals are checked too. Magnesium and ...



