Ferritin: Optimal Levels and How to Raise Low Iron Safely
Updated June 2026
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Last updated: June 2026 - Reviewed by the Apexzen editorial team
Part of: Blood Biomarkers Guide
What is ferritin? Ferritin is a protein that stores iron inside your cells, so a blood ferritin test is the most common way to estimate your iron reserves. When stores run low, your body has less iron available to make hemoglobin and carry oxygen - which can show up as fatigue, poor exercise tolerance, brittle nails, or hair shedding. Because ferritin can also rise with inflammation, it is interpreted alongside other markers, not in isolation.
Optimal and reference range
The figures below are typical lab reference ranges, which vary by lab and individual. Your own report's range is the one that counts. Discuss your results with your doctor or clinician.
| Group | Typical reference range | Units |
|---|---|---|
| Adult men | about 30 to 400 | ng/mL |
| Adult women | about 15 to 150 | ng/mL |
Ranges vary by lab and individual; discuss your results with your doctor.
How to raise low ferritin safely
Lifestyle and diet come first, under a clinician's guidance:
- Eat iron-rich foods - lean red meat, poultry, fish, lentils, beans, tofu, and dark leafy greens.
- Pair plant-based iron with vitamin C (citrus, peppers, tomatoes) to improve absorption.
- Be aware that tea, coffee, and calcium-rich foods can reduce iron absorption when taken with meals.
- Most importantly, find out why iron is low - blood loss, diet, or absorption issues all need different fixes.
Important: do not self-supplement iron
Iron supplements should only be taken when a doctor confirms a deficiency and sets the dose. Too much iron is harmful and can build up in organs. Apexzen does not sell iron supplements, and we recommend you have your levels tested and discuss any treatment with your doctor before supplementing.
When to talk to your doctor
See your doctor if ferritin is below or above your lab's range, or if you have ongoing fatigue, breathlessness, or unusual hair loss. Very high ferritin can signal inflammation or iron overload and also needs evaluation. Your clinician can identify the cause and decide whether treatment is needed.
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Take the QuizFrequently asked questions
What is a good ferritin level?
It depends on your lab and your sex. The numbers above are typical lab reference ranges, which vary by lab and individual. Your clinician will interpret your result against your own report and symptoms.
How fast can ferritin rise?
It varies. With dietary changes and any doctor-prescribed treatment, ferritin often climbs over weeks to months, and your doctor will usually retest to track progress.
Can I just take an iron supplement?
No - not without medical advice. High iron is harmful, and the cause of low iron should be diagnosed first. See your doctor before supplementing iron.
Related reading: Blood Biomarkers Guide and Vitamin D Deficiency: Signs and Optimal Levels.
Sources: National Institutes of Health, Office of Dietary Supplements (NIH); Mayo Clinic - iron and ferritin reference guidance.
This article is for educational purposes only and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Apexzen products are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before changing your diet, supplements, or treatment.