Ferritin and Hair Loss: What Your Blood Result Really Means
Ferritin and hair loss are linked through iron: ferritin shows how much iron your body has in storage, and it is one of the first blood results worth looking at when hair starts shedding. This guide explains what the number means, the threshold NICE guidance uses, why a result can mislead, how low iron fits with hair shedding, and what to ask your GP, so you can read your own result with more confidence.
If you already know your result is low and want to raise it, our separate guide on how to increase ferritin, linked further down, covers food and supplements; this page is about understanding ferritin and hair loss. Women weighing up a supplement can read our guide to hair vitamins for women, which covers iron, pregnancy and menopause.
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Ferritin and hair loss are connected because ferritin is the protein that stores iron, and a blood test for it is the most reliable single guide to your body's iron stores, according to NICE guidance. NICE CKS says a ferritin result below 30 micrograms per litre confirms iron deficiency, but that inflammation or infection can push ferritin up even when iron is low. The NHS lists iron deficiency among the causes of hair loss, usually as shedding that settles once iron is restored.
Key takeaways
- Ferritin reflects stored iron. NICE CKS calls it the test that most reliably tracks total body iron stores.
- A ferritin below 30 micrograms per litre confirms iron deficiency, according to NICE CKS.
- Infection and inflammation can raise ferritin, so a normal result does not always rule out low iron.
- Ferritin and hair loss are linked through shedding: low iron typically causes hair shedding, not permanent hair loss, and the NHS lists it among the causes of hair loss.
- Do not self-supplement at high doses. The NHS says 17mg or less of iron a day from supplements is unlikely to cause harm.
What are ferritin levels and what do they measure?
Ferritin levels measure the amount of ferritin in your blood, a protein that stores iron inside the body, and they are used as a guide to how full your iron stores are. NICE Clinical Knowledge Summaries describe serum ferritin as the blood test that most reliably correlates with total body iron stores. In other words, it shows your reserves rather than the iron in use today.
That difference matters. Haemoglobin, the iron-carrying part of red blood cells, can still look normal while your stores are running down, because the body raids its reserves to keep red cells going. So a low ferritin can show up before full anaemia does. When a GP checks for iron problems, the NHS explains, the blood test also looks at red blood cells and checks for other types of anaemia such as vitamin B12 or folate deficiency, so ferritin is usually read alongside other results rather than on its own.
What ferritin result counts as low?
A ferritin result below 30 micrograms per litre confirms iron deficiency in all people, according to NICE Clinical Knowledge Summaries. That is the clearest threshold in UK guidance, and it is the one to anchor on when you read your result. Laboratories print their own reference ranges on reports, so the "normal" range you see may look slightly different, but the 30 microgram per litre point is the one NICE uses to confirm low iron.
You may read online that hair needs a much higher ferritin than this. Some hair specialists do argue for higher targets, but the NHS and NICE sources checked for this page do not set a separate hair-specific figure, and the research on an ideal number for hair is not settled. Be cautious about any single "perfect ferritin for hair" figure you see, and ask your GP how your own result fits with your symptoms.
| Result | What NICE CKS says | What to do |
|---|---|---|
| Below 30 micrograms per litre | Confirms iron deficiency | Your GP will look for the reason and advise on iron |
| Within range, but you have symptoms | May be misleading if you have infection or inflammation | Mention any recent illness or inflammatory condition |
| During pregnancy | Ferritin may be less reliable | Follow your midwife or GP's advice |
| High | Can be raised by infection or inflammation, even with low iron | Your GP will read it alongside other results |
Why can a normal ferritin result be misleading?
A normal ferritin result can be misleading because ferritin also rises during infection and inflammation, so NICE CKS warns that levels can be high even when iron deficiency is present. A recent cold, a flare of an inflammatory condition, or any active infection can nudge the number up and hide low stores underneath.
NICE CKS also notes that ferritin may be less reliable in pregnancy. That is why a single result is best read in context. If you were unwell around the time of the test, say so, and ask whether a repeat test later or other iron markers would help. This is one of the reasons it is worth seeing a GP rather than relying on a home finger-prick kit and a number with no interpretation.
Tell your GP about recent illness
If you had a cold, a flare-up or any infection in the weeks before your blood test, mention it. It can raise ferritin and make low iron stores look normal.
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How are ferritin and hair loss linked?
Ferritin and hair loss are linked because iron deficiency is one of the recognised triggers for telogen effluvium, the medical name for diffuse shedding, so a low ferritin result is a common finding behind a sudden rise in hair fall. DermNet lists nutritional deficiency, including iron deficiency, alongside illness, surgery, stress and thyroid disorders among its causes. The NHS hair loss page also names iron deficiency as one of the things that can cause hair loss. Blood pressure is the other circulatory worry readers raise here, and our guide to whether high blood pressure causes hair loss sets out what the evidence actually shows.
The shedding tends to arrive late. DermNet explains that increased hair fall is usually noticed two to four months after a trigger, because hairs that stopped growing stay in the scalp for around three months before new hairs push them out. It then usually tapers back to normal over six to nine months once the cause is dealt with, and DermNet advises correcting any problem with iron, thyroid function, vitamin B12 or folic acid. Our guide to what causes telogen effluvium covers the other common triggers.
Is it hair loss, hair shedding or hair breakage?
Low iron usually causes hair shedding rather than permanent hair loss, and it has nothing to do with hair breakage, so it helps to know which one you are seeing. Hair shedding is whole hairs falling early, each with a small white bulb at the root, spread across the scalp. Hair loss in the pattern sense is gradual thinning in a pattern, such as a widening parting, over months or years. Hair breakage is the fibre snapping from heat, colour or rough handling, leaving short pieces with no bulb.
The NHS says losing 50 to 100 hairs a day is normal. If you are losing far more, with bulbs on the ends, and it started a few months after heavy periods, pregnancy, a diet change or an illness, low iron is a sensible thing to check. If the pieces are short and bulb-free, look at your styling habits instead. Our page on how long telogen effluvium lasts sets out the typical recovery time.
What causes low ferritin?
Low ferritin is usually caused by blood loss, pregnancy or not getting enough iron from food, and the NHS names heavy periods and pregnancy as very common causes of iron deficiency anaemia. In pregnancy, the NHS says it is most often due to a lack of iron in the diet. Bleeding in the stomach or bowel is another common cause, which is one reason a GP looks for the underlying reason rather than just handing out iron.
The NHS lists bleeding linked to regular use of anti-inflammatory painkillers such as ibuprofen and aspirin, stomach ulcers, inflammation of the bowel or food pipe, and piles as possible sources. Less commonly, bowel or stomach cancer can be the cause, which is why unexplained low iron, especially in men and in women after the menopause, always deserves a proper look from a GP. Diet alone is a common cause in people who eat little meat and few iron-rich plant foods.
| Group | Daily iron need (NHS) |
|---|---|
| Men 19 and over | 8.7mg |
| Women 19 to 49 | 14.8mg |
| Women 50 and over | 8.7mg (more if periods continue) |
How do you raise ferritin levels safely?
You raise ferritin safely by finding and fixing the cause with your GP and, where needed, taking iron in the way they advise, rather than self-supplementing at high doses. The NHS says that when a blood test shows iron deficiency anaemia, iron tablets are usually recommended and taken for about six months, with repeat blood tests to check progress. Stores refill slowly, which is also why hair takes months to settle.
Food helps, especially for prevention. The NHS lists good sources of iron as red meat, beans such as kidney beans, edamame and chickpeas, nuts, dried fruit such as apricots, fortified breakfast cereals and soy bean flour, and liver, which should be avoided in pregnancy. Be careful with supplements: the NHS says taking 17mg or less a day of iron supplements is unlikely to cause harm, high doses over 20mg can cause constipation, sickness and stomach pain, and very high doses can be fatal, particularly for children. For food-first ideas, see our guide on how to increase ferritin.
How should you care for your hair while iron recovers?
While iron recovers, hair care should focus on keeping the hair you have and helping it look fuller, because shedding from low iron usually takes months to settle. Wash gently as often as your scalp needs. Condition every time. Detangle wet hair slowly from the ends with a wide-tooth comb. Keep heat low and use protection, and loosen tight styles that pull at the roots.
Shed hairs will still fall, because they were already on their way out, but breakage on top of shedding makes the problem look worse than it is. A calm, consistent routine keeps the lengths strong while your stores rebuild, and it makes it easier to see when the shedding genuinely eases. Our guide to what genuinely helps with shedding covers the day-to-day habits in more depth.
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When should you see a GP about ferritin and hair loss?
You should see a GP if you are shedding heavily, feel unusually tired or breathless, or have heavy periods, because the NHS advice is that a GP will usually arrange a blood test and look for the cause of any iron deficiency. See a GP promptly if you are a man or a woman past the menopause with unexplained low iron, or if you notice changes in your bowel habits or blood in your stool.
A GP visit is also the right place to discuss iron tablets, since the right amount and duration depend on your result and the cause. If your question is about products or a routine rather than a medical one, you can talk to Gail Waterman, our co-founder, as an AI avatar on the Watermans homepage. Zinc is the other mineral people ask about, and our zinc supplementation guide explains the NHS limit and the copper risk.
What are the frequently asked questions about ferritin and hair loss?
What ferritin level is considered low?
NICE CKS says a serum ferritin below 30 micrograms per litre confirms iron deficiency. Laboratories print their own ranges, so ask your GP how your result reads.
Can low ferritin cause hair loss?
Yes, through shedding. Ferritin and hair loss are linked by telogen effluvium: DermNet lists iron deficiency among its triggers, and the NHS names iron deficiency as a cause of hair loss. It usually settles once iron is restored.
Can my ferritin be normal even if my iron is low?
Yes. NICE CKS warns that infection or inflammation can raise ferritin even when iron deficiency is present, so a normal result is not always the full story.
How long does hair take to recover after low iron?
DermNet says shedding usually tapers back to normal over six to nine months once the trigger is dealt with. The NHS says iron tablets are usually taken for about six months.
Is there an ideal ferritin for hair?
The NHS and NICE sources checked for this page do not set a hair-specific figure, and the research is not settled. Ask your GP how your result fits your symptoms.
Should I take iron supplements for my hair?
Only on advice. The NHS says 17mg or less a day from supplements is unlikely to cause harm, while high doses can cause side effects and very high doses can be dangerous.
What foods are high in iron?
The NHS lists red meat, beans and pulses such as kidney beans and chickpeas, nuts, dried fruit, fortified breakfast cereals and soy bean flour among good sources.
Can a shampoo fix low iron?
No. Low iron needs its cause found and fixed with your GP. A gentle shampoo and conditioner help hair look fuller and reduce breakage while it recovers.
What is the bottom line on ferritin and hair loss?
The bottom line on ferritin and hair loss is that ferritin is the most useful single guide to your iron stores, with NICE CKS using 30 micrograms per litre as the point that confirms deficiency. Read a result in context, since inflammation can hide low iron, and let your GP find the cause. Low iron usually causes shedding that settles over months once stores refill.
While that happens, protect the hair you have with a gentle routine. A mild hair growth shampoo used alongside conditioner is a simple way to keep hair looking fuller during the months it takes iron to recover.
Sources & references
- NICE Clinical Knowledge Summaries, Anaemia: iron deficiency, checked 18 September 2026.
- NHS, Iron deficiency anaemia, checked 18 September 2026.
- NHS, Iron (vitamins and minerals), checked 18 September 2026.
- NHS, Hair loss, checked 18 September 2026.
- NHS, Blood tests, checked 18 September 2026.
- DermNet, Telogen effluvium (hair shedding), checked 18 September 2026.
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