What to watch with Ferritin and Sport?

Ferritin is the body's iron storage protein and a critical marker for athletes. Intense training increases iron demand for red blood cell production, muscle repair, and oxygen transport, while iron is lost through sweat, gastrointestinal microbleeding, and foot-strike hemolysis. Low ferritin (<30 ng/mL) indicates depleted iron stores and can impair endurance, cause fatigue, reduce recovery, and increase injury risk – even if hemoglobin is still normal. Endurance athletes, menstruating women, and plant-based eaters are especially vulnerable. Conversely, elevated ferritin (>200 ng/mL men, >150 ng/mL women) may signal inflammation, infection, or iron overload disorders like hemochromatosis; supplementing without cause can be dangerous. Evidence for ferritin monitoring in sports is human-moderate: strong observational data link low ferritin to performance deficits, but optimal thresholds are debated and context-dependent. Safety note: iron supplementation without deficiency can cause oxidative stress and organ damage. Practical advice: test ferritin at least annually; more often if symptomatic or high-risk. If ferritin is below 30–40 ng/mL, consider iron supplementation under medical guidance, with re-testing to avoid overload. MyBody-X DNA tests do not measure ferritin – this requires a blood test.