symptom

Iron Deficiency Hair Loss in Women: Ferritin Levels & Regrowth

The biological link between ferritin levels and hair follicle shedding (telogen effluvium), testing thresholds, and regrowth expectations.

By Nourish By Nutrients Editorial Team • Updated: October 2026

Key Evidence Takeaways:

  • Low ferritin stores can trigger hair follicle regression into shedding (telogen) phase.
  • Hair loss alone does not confirm iron deficiency—testing ferritin is essential.
  • Rebuilding iron stores and restoring hair density typically requires 3 to 6 months.