Low Ferritin Hair Loss London. Why A Normal Result Can Still Be Too Low
Ferritin is the protein that stores iron, and low ferritin is one of the most common treatable causes of hair shedding, particularly in women. Many laboratories report ferritin from 15 micrograms per litre as normal for women, yet NICE confirms iron deficiency below 30. A result can be called normal while still being too low for healthy hair.
Key points
In the UK National Diet and Nutrition Survey, 49 percent of girls aged 11 to 18 and 25 percent of women aged 19 to 64 had iron intakes below the lowest recommended level.
NICE guidance uses a ferritin below 30 micrograms per litre to confirm iron deficiency, yet many laboratories report results from 15 as normal for women.
A 2021 study of 480 people found ferritin was lower in people with telogen effluvium, the most common type of diffuse shedding, and a level around 24.5 best separated them from healthy controls.
At The London PRP Clinic by The Wellness, a targeted blood panel through The Online GP by The Wellness is from £295, and a hair consultation with trichoscopy is from £300.
Told your iron is normal but still shedding? Message our doctors on WhatsApp or email team@thewellnesslondon.com.
What is ferritin and why does hair need it?
Ferritin stores iron inside cells and a small amount circulates in the blood, so a ferritin blood test is the most useful single measure of how much iron your body has in reserve. Iron is needed by rapidly dividing cells, and hair follicle cells divide faster than almost any others in the body.
When iron stores run low, the body protects essential functions such as making red blood cells. Hair is not essential, so follicles are among the first to feel the shortfall. More of them move into the resting phase, and the result is diffuse shedding a few months later. This can happen well before iron is low enough to cause anaemia, which is why a normal haemoglobin does not rule out iron as the cause.
Why can a normal ferritin result still be too low?
The reference range problem
Reference ranges describe what is common in the population, not what is ideal for hair. Many UK laboratories use a range for women that starts at 15 micrograms per litre. NICE guidance uses a ferritin below 30 to confirm iron deficiency. A woman with a ferritin of 18 may therefore be told her result is normal while meeting the NICE threshold for iron deficiency.
What the research shows for hair
A 2021 study by Cheng and colleagues in Clinical, Cosmetic and Investigational Dermatology compared 193 people with telogen effluvium, 104 women with female pattern hair loss and 183 healthy controls. Ferritin was lower in the telogen effluvium group, and a ferritin around 24.5 micrograms per litre best separated those with shedding from those without. The authors concluded that ferritin could be a useful marker for diagnosing telogen effluvium.
There is no single agreed ferritin target for hair, and studies disagree on the exact figure. Many hair specialists aim higher than the bottom of the reference range when shedding is present, and we interpret each result alongside your symptoms, history and other markers rather than against a number alone.
When ferritin can look falsely reassuring
Ferritin rises during inflammation, infection and some chronic conditions, so a result can look adequate while the iron available to the body is low. Measuring transferrin saturation and C-reactive protein alongside ferritin helps us read it correctly.
Want your ferritin read properly? Ask our doctors on WhatsApp.
Who is most at risk of low ferritin?
Women with heavy periods. Women in the year after pregnancy, when iron is often depleted, as we explain in postpartum hair loss. People who eat little or no red meat, including vegetarians and vegans, unless their diet is carefully planned. Endurance runners and athletes. People who have had weight-loss surgery, or who are losing weight quickly on medicines such as semaglutide or tirzepatide. People with coeliac disease or other conditions that affect absorption. Regular blood donors.
Low iron also commonly sits alongside an underactive thyroid, which can cause heavy periods. We cover that link in thyroid hair loss.
How do I know if iron is behind my hair loss?
Diffuse shedding across the whole scalp, often noticed in the shower or brush. Hair that feels thinner overall rather than receding at the temples. Tiredness, breathlessness on exertion, brittle or ridged nails, restless legs or craving ice. Shedding that began a few months after a period of heavy bleeding, illness, dieting or pregnancy. Our guide to hair loss after illness or surgery explains the timing.
How is low ferritin hair loss assessed?
You are assessed with a full scalp examination and trichoscopy, a magnified view that shows whether follicles are simply shedding or shrinking, so we can tell iron-related shedding from pattern hair loss or a mixture of both. We take standardised photographs so recovery can be measured.
A blood panel arranged by The Online GP by The Wellness and processed by an accredited partner laboratory checks ferritin, serum iron, transferrin saturation and C-reactive protein, alongside full thyroid function, vitamin D, B12, folate, zinc, full blood count and HbA1c. The reasoning behind each marker is in the hair loss blood panel.
Where iron deficiency is confirmed, we also think about why. Heavy periods, diet and absorption problems each need a different response, and unexplained iron deficiency, especially in men or after the menopause, needs investigating by your GP.
How do you recover from low ferritin hair loss?
Replacing iron
Oral iron is the usual first step. Taking it on alternate days rather than every day can improve absorption and reduce stomach side effects, and vitamin C or a small glass of orange juice can help. Avoid tea, coffee and calcium supplements at the same time. We recheck ferritin after about 3 months to confirm stores are recovering. Intravenous iron is an option for people who cannot absorb or tolerate tablets. Do not take iron supplements without a blood test, because too much iron is harmful.
What to expect
Shedding usually slows a few months after iron stores recover, and visible thickening follows over the next 6 to 12 months, as new hair grows at roughly 1 centimetre a month.
When to add treatment
If shedding has settled but hair remains thin, pattern hair loss may also be present. PRP works best on follicles that are not held back by a deficiency, which is why we correct iron first. Correcting low ferritin is also one of the most common reasons a second course of PRP succeeds where a first did not, as we explain in why didn't my PRP work. Our full guides are PRP for women's hair loss and PRP hair treatment London.
How much does an iron and hair check cost in London?
At The London PRP Clinic by The Wellness, there are 3 ways to begin.
A targeted blood panel through The Online GP by The Wellness is from £295, or a comprehensive panel from £495, including full iron studies, thyroid function and vitamins.
A hair consultation with full scalp examination and trichoscopy is from £300, included at the first session if you go on to a course of PRP.
If treatment is right for you, PRP is from £450 per session or £1,200 for a course of 3.
Ask about an iron and hair check. Message us on WhatsApp.
Why people choose The London PRP Clinic by The Wellness
Every treatment is performed by a GMC-registered doctor, and no clinician treats a patient here until they have completed 100 supervised treatments. Every hair plan begins with trichoscopy and a full blood panel, and we read ferritin against what hair needs rather than only against the reference range. When correcting a deficiency is all you need, we say so.
We see patients across our London clinics, including 10 Portman Square in Marylebone and The Wellness at The Light Centre in Belgravia. Across our work we report an 87 percent patient success rate and more than 187 five-star reviews. How we practise is set out in our clinical standards.
Book your hair consultation. Message us on WhatsApp, email team@thewellnesslondon.com, or call +44 20 3951 3429.
Frequently asked questions about low ferritin and hair loss
Can low ferritin cause hair loss?
Yes. Low iron stores are one of the most common treatable causes of diffuse hair shedding, and hair can be affected before iron is low enough to cause anaemia.
What ferritin level is needed for hair growth?
There is no single agreed figure. NICE uses a ferritin below 30 micrograms per litre to confirm iron deficiency, and a 2021 study found a level around 24.5 best separated people with shedding from those without. We interpret each result alongside symptoms and other markers.
Why was I told my ferritin is normal?
Many laboratories report ferritin from 15 micrograms per litre as normal for women, which is below the NICE threshold for iron deficiency. A normal result is not always an adequate one for hair.
How long does hair take to grow back after low ferritin?
Shedding usually slows a few months after iron stores recover, and visible thickening follows over 6 to 12 months.
Should I take iron supplements for hair loss?
Only after a blood test confirms low iron, because too much iron is harmful. Alternate-day dosing can improve absorption, and ferritin should be rechecked after about 3 months.
Does PRP work if my ferritin is low?
PRP works best when deficiencies are corrected first. Low ferritin is a common reason PRP underperforms, so we check and correct it before or alongside treatment.
References
Public Health England and Food Standards Agency. National Diet and Nutrition Survey. Results from years 9 to 11 combined. gov.uk
National Institute for Health and Care Excellence. Clinical Knowledge Summary. Anaemia, iron deficiency. cks.nice.org.uk
Cheng T, Fang H, Wang Y, et al. The diagnostic value of serum ferritin for telogen effluvium. A cross-sectional comparative study. Clinical, Cosmetic and Investigational Dermatology. 2021;14:137-141. doi.org/10.2147/CCID.S291170
This article is for information and does not replace personal medical advice. All treatments at The London PRP Clinic by The Wellness are performed by GMC-registered doctors. Reviewed by a GMC-registered doctor at The London PRP Clinic by The Wellness. Last updated October 2026.
