wieviel eisen bei haarausfall — which blood markers matter?

The question of iron for hair loss is relevant, but the evidence is moderate and not conclusive. Iron deficiency can contribute to diffuse hair loss (telogen effluvium), especially in premenopausal women. Key blood markers include: **serum ferritin** (iron stores; levels <30–40 ng/ml are considered risky, optimal >70 ng/ml), **hemoglobin** (to rule out anemia), **transferrin saturation**, and **MCV**. However, low ferritin alone is not diagnostic for hair loss – many individuals with low ferritin have normal hair. The evidence is mostly observational; robust RCTs are lacking. Iron supplementation without confirmed deficiency is not recommended, as excess iron may promote oxidative stress. Always test ferritin and CRP (inflammation elevates ferritin) before supplementing. Dosage depends on the deficit: typically 50–100 mg elemental iron/day, but only under medical supervision. Consumer DNA tests for iron status are not clinically validated. Evidence: human-moderate.