Hair shedding without a clear cause is one of the most common reasons people end up at a blood test. Low iron stores, measured by ferritin, is one of the first things worth checking. Hair follicles are sensitive to iron supply and respond before red cells become anaemic.
What ferritin is and why hair cares
Ferritin is the protein that stores iron in your body. Blood ferritin reflects how much iron is in storage. When stores fall, hair follicles can struggle to support the growth phase, leading to shedding (telogen effluvium) within weeks to months. This happens before iron-deficiency anaemia shows up on a full blood count, so it can be missed if only haemoglobin is checked.
What ferritin level is associated with hair issues
Standard UK reference ranges classify ferritin below 15 ng/mL as deficient. But many trichologists and dermatologists report hair issues in women with ferritin under 30 to 50 ng/mL. The optimal range for active women with persistent shedding is often cited as 50 to 100 ng/mL.
Common causes of low ferritin
Heavy menstrual bleeding is the leading cause in women. Vegan or vegetarian diets without iron supplementation. Pregnancy and breastfeeding. Endurance running (foot strike haemolysis). Frequent blood donation. Gastrointestinal losses or absorption problems.
What to do with a low result
Address the underlying cause first. Iron rich foods (red meat, liver, oily fish, eggs, lentils, dark leafy greens) paired with vitamin C improve absorption. Iron supplementation under medical guidance can lift ferritin significantly over 3 to 6 months. Heavy menstrual bleeding may need a separate conversation with your GP. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional.
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Frequently asked questions
How long does it take to raise ferritin?
Consistent iron supplementation typically raises ferritin by 30 to 50 ng/mL over 3 months. Severe deficiency may need intravenous iron under medical supervision.
Can ferritin be normal but I still have hair loss?
Yes. Hair loss has many causes including thyroid issues, hormonal changes, autoimmune conditions and stress. If ferritin is in good range and hair shedding continues, see your GP for further investigation.
About this article. Educational content. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional. For medical advice about your health or results, please speak to a qualified clinician.
