# Ferritin

> Ferritin is often called the body's 

*Source: [https://www.health3.app/biomarkers/ferritin](https://www.health3.app/biomarkers/ferritin)*

### On This Page

- What it measures
- Measurement units
- Reference ranges
- Health impact
- Related biomarkers
- Scientific references

## What is Ferritin?

**Ferritin** is often called the body's "iron savings account", a protein that stores iron inside cells and releases it when needed. It serves as one of the most reliable indicators of the body's iron stores, making it essential for tracking energy levels, physical performance, and overall vitality. Beyond just iron storage, ferritin plays crucial roles in cellular protection against oxidative stress and serves as an important inflammation marker. Health optimizers and biohackers monitor ferritin because it provides insights into both iron status and inflammatory processes. Optimal ferritin levels support efficient oxygen transport, muscle function, cognitive performance, and recovery from exercise. The balance is key—too little leads to fatigue and poor performance, while too much can indicate inflammation or iron overload.[Wang, 2010][Kell, 2014]

**When ferritin runs low**, it is commonly associated with persistent fatigue, decreased exercise tolerance, poor concentration, and slower recovery from workouts. Many people report feeling "tired but wired" or notice their athletic performance declining despite adequate training. Low ferritin can occur even when other blood markers like hemoglobin appear normal, making it a valuable early indicator of iron depletion. Those tracking their metrics often find that addressing low ferritin significantly improves energy levels, mood, and physical performance before more obvious signs of anemia develop.[Soppi, 2018]

**When ferritin runs high**, it often signals inflammation in the body rather than true iron overload. Elevated ferritin can indicate that the immune system is responding to stress, infection, or chronic inflammation. For wellness-focused individuals, persistently high ferritin may suggest the need to address underlying inflammatory triggers like poor sleep, chronic stress, or dietary factors. While moderate elevation is common during illness or intense training periods, consistently high levels warrant attention to recovery protocols and anti-inflammatory strategies.[DePalma, 2021]

**Factors that support healthy ferritin levels:**

1. **Iron-rich foods balanced strategically:** Lean red meat, dark leafy greens, and legumes are good sources, and pairing iron-rich meals with vitamin C sources like citrus or bell peppers enhances absorption.
2. **Timing nutrients wisely:** Calcium-rich foods, coffee, or tea consumed with iron-rich meals can significantly reduce iron absorption.
3. **Monitoring inflammation markers:** Tracking recovery, managing stress effectively, and ensuring adequate sleep can help prevent inflammatory spikes that artificially elevate ferritin.
4. **Donation where appropriate:** For those with consistently high ferritin, regular blood donation can help maintain optimal levels while supporting community health.
5. **Gut health:** A healthy microbiome and addressing any digestive issues that might impair iron absorption or contribute to inflammation are supportive.

## Measurement Units

Ferritin can be measured in: ng/mL, nmol/L, pmol/L, µg/100mL, µg/dL, µg/L, µg%

## Reference Ranges by Age and Gender

Reference ranges represent typical values for healthy individuals. A healthcare provider must interpret individual results.

| Age Range | Gender | Unit | Optimal | Normal | Source |
| --- | --- | --- | --- | --- | --- |
| 17 - 37 | Man | µg/L | - | 39.3 - 439.4 | Rifai, 2022 |
| 25 - 49 | Woman | µg/L | - | 6.5 - 147.1 | Rifai, 2022 |
| 38 - 79 | Man | µg/L | - | 45.8 - 714.8 | Rifai, 2022 |
| 50 - 79 | Woman | µg/L | - | 6 - 362.6 | Rifai, 2022 |

## Related Biomarkers

- [**Soluble Transferrin Receptor (sTfR)**](https://www.health3.app/biomarkers/stfr)

 Because ferritin is an acute-phase reactant, it can be falsely "normal" in patients with inflammation and mask coexisting iron deficiency. The soluble transferrin receptor is unaffected by inflammation, and the sTfR / log-ferritin index distinguishes iron-deficiency anemia from anemia of chronic disease.
- [**Vitamin C**](https://www.health3.app/biomarkers/vitaminc)

 Vitamin C significantly enhances iron absorption from plant-based sources, potentially helping optimize ferritin levels in those with deficiency. Studies demonstrate that combining vitamin C with iron-rich meals can increase absorption by up to 300%. This relationship makes vitamin C status crucial for those trying to build iron stores through dietary approaches.[Saunders, 2013]
- [**Iron**](https://www.health3.app/biomarkers/iron)

 Ferritin is the primary iron storage protein in cells, with serum ferritin serving as the most reliable indicator of body iron stores. The relationship is fundamental — ferritin levels directly reflect iron storage capacity and availability.[Wang, 2010]
- [**Copper (Free)**](https://www.health3.app/biomarkers/copper_free)

 Copper deficiency can lead to functional iron deficiency despite adequate ferritin stores, as iron cannot be properly mobilized without adequate copper-dependent activity.[Fields, 1997]
- [**Copper (Total)**](https://www.health3.app/biomarkers/copper_total)

 Copper deficiency can lead to functional iron deficiency despite adequate ferritin stores, as iron cannot be properly mobilized without adequate copper-dependent activity.[Fields, 1997]

## Related tools

- [**Ferritin Level Interpreter**](https://www.health3.app/tools/ferritin-level-interpreter)
- [**Transferrin Saturation Reference Tool**](https://www.health3.app/tools/iron-saturation-calculator)
- [**Blood Test Unit Converter**](https://www.health3.app/tools/blood-test-unit-converter)
- [**Iron panel blood test guide**](https://www.health3.app/blog/iron-panel-blood-test-guide)

## Academic References

1. Rifai N.. Tietz Textbook of Laboratory Medicine (2022). *Elsevier*. [View Source](https://bookshelf.health.elsevier.com/books/9780323834698)
2. Wang W. Serum ferritin: Past, present and future (2010). *Biochim Biophys Acta*. [View Source](https://pubmed.ncbi.nlm.nih.gov/20304033/)
3. Kell DB. Serum ferritin is an important inflammatory disease marker, as it is mainly a leakage product from damaged cells (2014). *Metallomics*. [View Source](https://pubmed.ncbi.nlm.nih.gov/24549403/)
4. Saunders AV. Iron and vegetarian diets (2013). *Med J Aust*. [View Source](https://onlinelibrary.wiley.com/doi/abs/10.5694/mja11.11494)
5. Fields MB. Ferritin Is Not an Indicator of Available Hepatic Iron Stores in Anemia of Copper Deficiency in Rats (1997). *Clin Chem*. [View Source](https://doi.org/10.1093/clinchem/43.8.1457)
6. Solomons NW. Competitive interaction of iron and zinc in the diet: consequences for human nutrition (1986). *J Nutr*. [View Source](https://doi.org/10.1093/jn/116.6.927)
7. Vallet N. Megaloblastic anemia-related iron overload and erythroid regulators: a case report (2021). *J Med Case Reports*. [View Source](https://doi.org/10.1186/s13256-021-03065-0)
8. Son NE. Influence of ferritin levels and inflammatory markers on HbA1c in Type 2 Diabetes mellitus patients (2019). *Pak J Med Sci*. [View Source](https://doi.org/10.12669/pjms.35.4.1003)
9. Fumeron F. Ferritin and transferrin are both predictive of the onset of hyperglycemia in men and women over 3 years (2006). *Diabetes Care*. [View Source](https://pubmed.ncbi.nlm.nih.gov/16936158/)
10. Liu L. The association between the levels of serum ferritin and sex hormones in a large scale of Chinese male population (2013). *PLoS One*. [View Source](https://doi.org/10.1371/journal.pone.0075908)
11. Mainous A. Relation of serum ferritin level to cardiovascular fitness among young men (2008). *American Journal of Cardiology*. [View Source](https://doi.org/10.1016/j.amjcard.2008.08.046)
12. Liu J.. Iron metabolism and type 2 diabetes mellitus: A meta-analysis and systematic review (2020). *Journal of Diabetes Investigation*. [View Source](https://pubmed.ncbi.nlm.nih.gov/31975563/)
13. Lee H. Psychiatric disorders risk in patients with iron deficiency anemia and association with iron supplementation medications: A nationwide database analysis (2020). *BMC Psychiatry*. [View Source](https://pubmed.ncbi.nlm.nih.gov/32393355/)
14. Kim BT. The association between higher serum ferritin level and lower bone mineral density is prominent in women ≥45 years of age (KNHANES 2008–2010) (2013). *Osteoporosis International*. [View Source](https://pubmed.ncbi.nlm.nih.gov/23592044/)
15. Smith S. Restless sleep associated with low ferritin levels: A retrospective study in a pediatric sleep center (2023). *Sleep*. [View Source](https://academic.oup.com/sleep/article/46/Supplement_1/A314/7182458)
16. Murray-Kolb LE. Iron treatment normalizes cognitive functioning in young women (2007). *American Journal of Clinical Nutrition*. [View Source](https://pubmed.ncbi.nlm.nih.gov/17344500/)
17. Cameli N. Restless sleep disorder and the role of iron in other sleep-related movement disorders and ADHD (2023). *Clin Transl Neurosci*. [View Source](https://doi.org/10.3390/ctn7030018)
18. Kell DB. Serum ferritin is an important inflammatory disease marker, as it is mainly a leakage product from damaged cells (2014). *Metallomics*. [View Source](https://pubmed.ncbi.nlm.nih.gov/24549403/)
19. Gulhar R, Ashraf MA, and Jialal I. Physiology, Acute Phase Reactants (2023). *StatPearls*. [View Source](https://www.ncbi.nlm.nih.gov/books/NBK519570/)
20. Donangelo CM. Supplemental zinc lowers measures of iron status in young women with low iron reserves (2002). *J Nutr*. [View Source](https://doi.org/10.1093/jn/132.7.1860)
21. van der Weyden MB. Red cell basic ferritin content of patients with megaloblastic anaemia due to vitamin B12 or folate deficiency (1984). *Scand J Haematol*. [View Source](https://doi.org/10.1111/j.1600-0609.1984.tb00710.x)
22. Babaei M. Serum ferritin levels and bone mineral density in the elderly (2018). *Caspian Journal of Internal Medicine*. [View Source](https://pmc.ncbi.nlm.nih.gov/articles/PMC6121340/)
23. Ayton S. Ferritin levels in the cerebrospinal fluid predict Alzheimer's disease outcomes and are regulated by APOE (2015). *Nature Communications*. [View Source](https://pubmed.ncbi.nlm.nih.gov/25988319/)
24. Liu W. Association between serum iron status and muscle mass in adults: Results from NHANES 2015–2018 (2022). *Frontiers in Nutrition*. [View Source](https://doi.org/10.3389/fnut.2022.941093)
25. Liu J.. The relationship between serum ferritin and insulin resistance in different glucose metabolism in nonobese Han adults (2015). *International Journal of Endocrinology*. [View Source](https://doi.org/10.1155/2015/642194)
26. Kryger MH. Low body stores of iron and restless legs syndrome: A correctable cause of insomnia in adolescents and teenagers (2002). *Sleep Medicine*. [View Source](https://pubmed.ncbi.nlm.nih.gov/14592231/)
27. Soppi E. Iron deficiency without anemia - a clinical challenge (2018). *Clin Case Rep*. [View Source](https://pubmed.ncbi.nlm.nih.gov/29881569/)
28. Kim BT. Iron overload accelerates bone loss in healthy postmenopausal women and middle-aged men: A 3-year retrospective longitudinal study (2012). *Journal of Bone and Mineral Research*. [View Source](https://pubmed.ncbi.nlm.nih.gov/22729843/)
29. Momeni A. Serum ferritin has correlation with HbA1c in type 2 diabetic patients (2015). *Advanced Biomedical Research*. [View Source](https://pmc.ncbi.nlm.nih.gov/articles/PMC4386204/)
30. Dignass A. Limitations of serum ferritin in diagnosing iron deficiency in inflammatory conditions (2018). *International Journal of Chronic Diseases*. [View Source](https://pubmed.ncbi.nlm.nih.gov/29744352/)
31. DePalma RG. Optimal serum ferritin level range: iron status measure and inflammatory biomarker (2021). *Metallomics*. [View Source](https://academic.oup.com/metallomics/article/13/6/mfab030/6287580)

### ⚠️ Important Medical Information

This reference page is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Reference ranges vary between laboratories. Always review your lab results with a qualified healthcare provider.