Any symptoms, topics, or research discussed in this article are provided for general educational and informational purposes only. They do not constitute product claims. Mention of these scientific studies does not imply that any Ritual products are formulated to treat, mitigate, or prevent any medical condition or address every health topic mentioned in this text. Refer to individual product packaging for specific substantiated benefits.*

The internet is suddenly abuzz with talk of "ferritin face," a term used to describe the pale, washed-out appearance some people are attributing to their low ferritin levels. As science nerds, we're a bit obsessed with the fact that a biomarker is going viral. But if you've seen the trend and aren’t as singularly obsessed with nutrition science as we are, you might be wondering: WTF is ferritin, and why is everyone suddenly talking about it?

Here's the 411: Ferritin is a protein that stores iron, and ferritin levels can tell you how much iron your body has in its reserves.^1,2 Low ferritin can therefore signal iron deficiency, which may cause symptoms like fatigue, trouble concentrating, and reduced exercise tolerance, even before you develop anemia.^1,8

But ferritin isn't always included in routine bloodwork, and even when it is, iron deficiency can be missed.⁶ Part of the problem is that your ferritin can fall within the “normal” range on a lab report even when your iron stores are low enough to indicate iron deficiency. Newer recommendations are beginning to account for this, recognizing iron deficiency at ferritin levels that may previously have been considered normal.^5,6

So, what should your ferritin level actually be? Here's what your results can tell you, why ferritin levels drop, and when it’s worth talking to your healthcare provider.

What is ferritin?

Ferritin is the protein your body uses to store iron. It's found mostly in your liver, spleen, and bone marrow.^1,2

Your body needs iron to make hemoglobin, the protein in red blood cells that carries oxygen, and to produce cellular energy. But loose iron is reactive and can damage cells, so your body doesn't leave it circulating freely. Ferritin gives your body a safe place to store iron until it's needed.^1,2

Ferritin itself is not something you can supplement. Because ferritin reflects your body’s stored iron, replenishing depleted iron stores can raise ferritin levels.^1,2

What’s the difference between a ferritin test and a serum iron test?

Serum iron measures the amount of iron circulating in your blood at the time of the test, while ferritin reflects how much iron your body has stored.^2,15

When your body starts running short on iron, it draws from your stored supply first. As those reserves shrink, ferritin falls. This drop can happen before anemia develops, which is why a ferritin test can detect iron deficiency before a standard complete blood count (CBC) does.^2,17

One caveat: ferritin can also rise in response to inflammation, infection, or certain health conditions, so a normal or high ferritin result doesn't always mean you have enough iron stored.^1,2

What is a normal ferritin level?

What qualifies as a normal ferritin level can be a bit confusing, partly because the "normal range" printed on your lab report isn’t necessarily the same threshold used to diagnose iron deficiency.

Here are the reference ranges for ferritin used by Mayo Clinic Laboratories:³

Group	Reference range (ng/mL)3
Women 18–50	6–175
Women 51 and older	11–328
Men 18 and older	31–409

Based on these reference ranges, a 30-year-old woman with a ferritin level of 7 ng/mL could technically receive a result marked "in range." But "in range" just means her ferritin level is considered typical compared with the lab's reference population.⁶

Diagnostics use different numbers. Clinically, ferritin levels below 15 ng/mL have long been used as the cutoff for iron deficiency.⁴ But increasing evidence suggests that iron stores can become depleted at even higher ferritin levels. One study found that a quarter of women with no detectable iron in their bone marrow—the definitive confirmation of iron deficiency—still had ferritin levels above 15 ng/mL.¹

More recent research has estimated that iron stores become depleted at around 25 ng/mL in premenopausal women, and 33 ng/mL in men and postmenopausal women.⁵ Using those thresholds, about a third of women ages 15 to 49 would be considered iron deficient, compared with 17% using the older 15 ng/mL cutoff.⁵

In September 2026, the American Society of Hematology issued clinical guidelines specifically for diagnosing iron deficiency, and its recommendations reflect this shift toward higher ferritin thresholds.⁶

Group	Iron Deficiency Threshold	Higher Threshold (50 ng/mL) Applies When
Menstruating individuals	30 ng/mL or lower6	If they have heavy or abnormal uterine bleeding, symptoms of iron deficiency, other risk factors, upcoming surgery, or are planning pregnancy6
Other adults, including postmenopausal women	30 ng/mL or lower6	If they have signs or symptoms of iron deficiency or ongoing risk factors6
Pregnant individuals	30 ng/mL or lower6	If they also have anemia6

For most adults, that means ferritin at or below 30 ng/mL now meets ASH's criteria for iron deficiency, while a threshold of 50 ng/mL may be appropriate for people with certain symptoms or risk factors.⁶

What does low ferritin mean?

Low ferritin generally indicates that your body's iron stores are depleted, which is a sign of iron deficiency.¹ Iron deficiency is not the same thing as anemia.

Iron deficiency develops in stages. Your iron stores fall first, which shows up as low ferritin. As those stores become depleted, less iron becomes available to make hemoglobin, the protein in red blood cells that carries oxygen throughout the body. Eventually, hemoglobin can fall low enough to qualify as anemia.²

As a result of how this process plays out, ferritin can be low while hemoglobin is still normal. This stage is called iron deficiency without anemia, and it’s more common than iron-deficiency anemia.^5,7 It’s often missed on a standard complete blood count (CBC) because ferritin is measured separately.¹⁵

What are the symptoms of low ferritin?

Symptoms of low ferritin can include fatigue, trouble concentrating, dizziness, headaches, and reduced exercise tolerance, though some people with low ferritin report no symptoms at all.^1,8

Low iron stores may also play a role in restless legs syndrome. In fact, guidelines recommend considering oral iron supplementation for people with restless legs syndrome when ferritin is 75 ng/mL or lower.⁹

Low ferritin has been linked to some types of hair loss as well, though the evidence is mixed. While some studies have found an association between low iron stores and hair loss, others haven’t established a clear connection.¹⁰

As for “ferritin face,” there isn’t research specifically linking the complexion described on social media to low ferritin. However, pallor—a paler-than-usual appearance of the skin—can occur with iron-deficiency anemia.⁸

What causes low ferritin?

Ferritin levels fall when your body uses or loses iron faster than it can replace it.⁸ For women, some of the most common reasons include:

Menstruation, especially heavy periods

Menstrual bleeding is a major cause of iron deficiency in women of reproductive age.^8,13 Menstruating women lose roughly 1.7 mg of iron a day from menstrual and other iron losses, compared with about 1.1 mg in men and postmenopausal women. The body compensates by absorbing more iron and drawing down its reserves, which is part of why ferritin runs lower during the reproductive years.⁵

Heavier bleeding increases the risk.^2,8 At least 1 in 10 menstruating women have heavy periods.²

Pregnancy

Your iron needs increase significantly during pregnancy, from 18 mg to 27 mg per day. In national survey data, about 18% of pregnant women in the U.S. were iron deficient, and deficiency was more common later in pregnancy: 6.9% of women in their first trimester, 14.3% in their second, and 29.7% in their third.²

Diet

Iron from plant foods isn't absorbed as readily as iron from animal sources, which is why recommended iron intake is higher for people who follow vegetarian or vegan diets.² But getting enough iron isn't simply a matter of dietary preference. Access to nutritious food matters, too: Socioeconomic status has been linked to iron deficiency risk, and U.S. research has associated food insecurity with iron-deficiency anemia in children and teens and low iron stores in pregnant women.^2,16

Conditions that interfere with absorption

Celiac disease, inflammatory bowel disease (IBD), previous stomach or intestinal surgery, and long-term use of acid-reducing medications can make it harder to absorb enough iron.^2,8

Blood donation

Regularly donating blood removes iron along with red blood cells; an estimated quarter to a third of regular donors become iron deficient.²

Endurance exercise

Iron deficiency affects up to 35% of female elite athletes.⁸ Hard training can increase iron losses through sweat and small amounts of gastrointestinal bleeding, while exercise-related inflammation can reduce iron absorption.⁸

Gastrointestinal bleeding

After menopause, gastrointestinal blood loss is a major cause of iron deficiency, and it can occur without noticeable symptoms. This bleeding has a number of causes, including ulcers, long-term aspirin or anti-inflammatory use, polyps, and, less often, colorectal cancer.^8,13

If your ferritin is low, identifying the root cause is important. Sometimes the explanation is relatively straightforward, such as heavy periods, pregnancy, or inadequate iron intake. When there isn't an obvious explanation, further evaluation may be needed to look for an underlying source of iron loss or poor absorption.

How is low ferritin diagnosed?

Low ferritin is diagnosed with a blood test that measures ferritin directly.^1,2 While a complete blood count (CBC) measures hemoglobin and can identify anemia, it typically doesn't include ferritin.² The separate ferritin test can help detect iron deficiency at an earlier stage than the CBC, because ferritin falls before hemoglobin does.^2,6

Your provider may also check transferrin saturation (TSAT). Transferrin is the protein that transports iron in your blood, and TSAT shows how much of that protein is actually carrying iron. So, a low TSAT can be another sign that your body doesn't have enough available iron.^1,8 Specifically, a TSAT below 20% can indicate iron deficiency. This marker is especially useful when inflammation, which raises ferritin regardless of how much iron you have stored, makes ferritin levels harder to interpret.^1,6,8,13,14

How is low ferritin treated?

Treating low ferritin involves both replacing the iron your body has lost and figuring out what caused the deficiency in the first place. Your healthcare provider can help determine whether dietary inadequacies, blood loss, or problems with iron absorption may be contributing and recommend the appropriate approach.

Oral iron supplementation is usually the first-line treatment.¹³ IV iron may be an option when oral iron isn't tolerated or absorbed well, when iron deficiency is severe, or when iron needs to be replaced more quickly, such as later in pregnancy.^8,13 It's given in a clinical setting and can replace a large amount of iron in one or a small number of infusions.

Diet can help you support healthy iron levels, though correcting a diagnosed deficiency generally calls for supplementation.¹³ Heme iron from meat, poultry, and seafood is more readily absorbed than non-heme iron from foods such as beans, lentils, tofu, and fortified cereals. Eating plant sources of iron with vitamin C can increase iron absorption.²

How do you choose an iron supplement?

Before you choose an iron supplement, it’s important to distinguish between supplements designed to help you meet your daily needs and those designed to help correct a diagnosed deficiency.

The Recommended Dietary Allowance of iron for non-pregnant, non-lactating women ages 19 to 50 is 18 mg per day, and many women don't get enough iron from food alone to meet that recommendation.² A multivitamin containing iron can help fill that dietary gap.

To determine whether you need additional iron to treat a deficiency, have your iron status checked, including your ferritin level. Taking high-dose iron when you don't need it can cause side effects. The upper limit for adults is 45 mg per day, a threshold based on gastrointestinal side effects such as nausea and constipation.² Higher doses may be used to treat a diagnosed deficiency under the guidance of a healthcare provider.^2,13

If you are diagnosed with an iron deficiency, there are several things to consider when choosing a standalone iron supplement. First, check the Supplement Facts label for the amount of iron per serving. This is the amount of actual iron you’re getting, sometimes called elemental iron. Your healthcare provider can help determine the appropriate dose based on your iron status.¹³

Iron also comes in several forms, which vary in how they’re absorbed and tolerated. Some forms, including amino acid chelates like ferrous bisglycinate, may be gentler on your stomach than conventional iron salts.²

How you take iron matters, too, especially at higher doses. After a dose of 60 mg or more, levels of hepcidin, a hormone that regulates iron absorption, can remain elevated for about 24 hours. While hepcidin is elevated, the amount of iron your body can absorb is temporarily limited.^8,11 For this reason, researchers have explored whether spacing higher doses farther apart, such as every other day, can improve absorption and tolerability. In one clinical study, iron-depleted women taking 60 mg every other day absorbed more iron than women taking the same dose on consecutive days.¹¹ A longer randomized clinical study found fewer gastrointestinal side effects with alternate-day dosing.¹²

Iron is generally best absorbed on an empty stomach. Taking it with a meal can substantially reduce absorption, and calcium, antacids, coffee, and tea can all interfere.^2,13 Nausea and constipation are common side effects, particularly with higher doses and certain forms of iron, such as ferrous sulfate. If side effects are a problem, your healthcare provider may recommend adjusting the dose or schedule.¹³

How long does it take to raise ferritin levels?

With oral iron supplementation, replenishing depleted iron stores can take several months. The specific duration depends on how depleted your iron stores are, how much iron you're able to absorb, and whether you're continuing to lose iron through things like heavy menstrual bleeding.^8,13 Your healthcare provider may repeat your bloodwork during treatment to see whether you're responding and adjust your treatment if needed.¹³

For people with iron-deficiency anemia, hemoglobin may return to normal before iron stores are fully replenished. That’s why guidelines recommend continuing oral iron for around three months after hemoglobin normalizes in order to give the body time to replenish its iron stores. But treatment length can vary depending on the cause of the deficiency and whether iron loss is ongoing.¹³

IV iron can replenish iron stores and raise ferritin more quickly than oral iron and may be used when faster replacement is needed or oral iron isn’t effective or well tolerated.^8,13

What does high ferritin mean?

High ferritin doesn't necessarily mean you have too much iron. Ferritin levels can also rise in response to inflammation and may be elevated with infections, autoimmune conditions, liver disease, heavy alcohol use, obesity, metabolic syndrome, and some cancers.^1,14 In fact, iron overload is a relatively uncommon cause of elevated ferritin compared with inflammation, liver disease, and other conditions.¹⁴

The WHO uses ferritin above 150 ng/mL in menstruating women and above 200 ng/mL in men and non-menstruating women as thresholds that may indicate a risk of iron overload in otherwise healthy adults.⁴ But ferritin alone shouldn’t be used to identify iron overload. An elevated result requires further evaluation, usually including transferrin saturation (TSAT), to help establish the cause.^4,14

When high ferritin does reflect iron overload, one possible cause is hereditary hemochromatosis, a genetic condition that causes the body to absorb too much iron. Over time, that excess can build up in organs including the liver, heart, and pancreas.^1,2 In women, the condition often doesn't surface until after menopause because menstruation removes iron each month, which can delay iron accumulation. Once periods stop, iron can accumulate more readily.^1,2,14 If ferritin is elevated and TSAT is also high, further testing for hemochromatosis may be recommended.^1,14

When should you talk to a healthcare provider about your ferritin levels?

Ferritin isn't always included in routine bloodwork, and interpreting the result isn’t always straightforward. Talk to your healthcare provider about your ferritin levels if:

• You have symptoms that could point to iron deficiency: persistent fatigue, trouble concentrating, dizziness, restless legs, or unexplained hair loss.^8,9
• You have a higher risk of iron deficiency: heavy periods, pregnancy, a vegetarian or vegan diet, regular blood donation, endurance training, or a condition that affects iron absorption can all raise risk.^2,6
• Your ferritin falls within your lab's reference range but below the newer ASH thresholds. Ask your healthcare provider how they interpret your result.⁶
• You're taking iron for a diagnosed deficiency. Your healthcare provider can repeat your labs to see whether your iron stores are recovering and determine how long you should continue treatment.¹³
• Your ferritin is high. Your provider may repeat the test and check TSAT to help determine whether excess iron, inflammation, or something else is responsible.¹⁴
• You develop iron deficiency after menopause or without a clear explanation. Your healthcare provider may need to investigate other sources of blood loss, including bleeding from the digestive tract.^8,13

Understanding your iron status

Your iron status can impact your quality of life, and ferritin levels can offer important insight into whether yours needs attention. Because iron stores can run low before you develop anemia, knowing your ferritin level can help you and your healthcare provider get a more complete picture of your iron status and determine whether treatment is needed.

If iron deficiency is diagnosed, supplementation can help replenish depleted iron stores. Your healthcare provider can help determine the right dose and schedule for you, while also addressing whatever is causing the deficiency in the first place.

FAQs

Is ferritin the same as iron?

No. Iron is the mineral; ferritin is the protein that stores it. A ferritin test measures how much iron you have in reserve. A serum iron test measures the iron circulating in your blood at that moment, which can change from day to day.^1,2,15

Is low ferritin the same as anemia?

No, but some people with low ferritin may have anemia. Low ferritin means your iron stores are depleted. Iron-deficiency anemia means your iron stores are depleted and your hemoglobin levels have dropped. Stores are depleted first, causing ferritin to fall; anemia develops later if iron deficiency progresses.²

Can you have low ferritin with normal hemoglobin?

Yes, and it's relatively common. This is called iron deficiency without anemia. A standard complete blood count (CBC) can miss it because your hemoglobin may still be normal; a ferritin test can identify iron deficiency earlier.^2,5,7,17

Can low ferritin cause hair loss?

Possibly. Low ferritin has been associated with some types of hair loss, but the evidence is inconclusive. Research also hasn’t clearly shown whether iron supplementation improves hair loss.¹⁰

Can your period cause low ferritin?

Yes. Menstrual bleeding is a major cause of low ferritin in women of reproductive age, and some evidence suggests that heavy periods may account for a third or more of iron-deficiency anemia in that group.²

How can I raise my ferritin levels quickly?

Raising ferritin usually takes time. With oral iron, replenishing depleted iron stores can take several months, depending on how low your stores are, how well you absorb iron, and whether you’re continuing to lose it. IV iron can replenish iron stores and raise ferritin more quickly than oral iron, but it’s typically reserved for situations where oral iron isn’t tolerated, isn’t working, or the deficiency is severe.^8,13

Can ferritin be high even if you don't have enough iron?

Yes. Ferritin rises with inflammation, infection, and liver disease regardless of iron status, so a normal or high reading can actually mask iron deficiency. If ferritin is high, your healthcare provider may also check transferrin saturation (TSAT) to help determine whether the elevation reflects iron overload or something else.^1,6,14

Can low ferritin affect your face?

"Ferritin face" is a social media term used to describe changes such as pale or grey-looking skin and dark under-eye circles that are attributed to low ferritin levels. While pallor can occur with iron-deficiency anemia, there isn't a specific set of facial changes that can tell you your ferritin is low.⁸ Dark circles and changes in skin tone can have many causes, so the only way to know whether low ferritin is contributing is with a blood test.⁶

If you and your healthcare provider decide iron supplementation makes sense for you, Ritual’s Iron BioSeries™ is the world’s first every-other-day iron dosing routine designed with hepcidin in mind. It’s formulated with ferrous bisglycinate chelate and vitamins A and C for optimal absorption and minimal GI discomfort.*

The information mentioned above is provided for educational purposes only, and does not constitute product claims related to Iron BioSeries™. Refer to individual product packaging or https://ritual.com/products/iron-bioseries for specific substantiated benefits.*

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

References

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2. Office of Dietary Supplements. Iron: fact sheet for health professionals [Internet]. Bethesda (MD): National Institutes of Health; [updated 2025 Sep 4; cited 2026 Sep 24]. Available from: https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/
3. Mayo Clinic Laboratories. Test ID FERR1: ferritin, serum [Internet]. Rochester (MN): Mayo Clinic Laboratories; [cited 2026 Sep 24]. Available from: https://www.mayocliniclabs.com/test-catalog/overview/FERR1
4. World Health Organization. WHO guideline on use of ferritin concentrations to assess iron status in individuals and populations. Geneva: World Health Organization; 2020.
5. Mei Z, Addo OY, Jefferds MED, Brittenham GM. Physiologically based serum ferritin thresholds for iron deficiency in US older adolescents and adults. Blood Red Cells Iron. 2026;2(1):100029. doi:10.1016/j.brci.2025.100029
6. Powers JM, Lim MY, Achebe MO, Akpan IJ, Auerbach M, Brown MC, et al. American Society of Hematology 2026 guidelines for diagnosis of iron deficiency. Blood Adv. 2026 Aug 24:bloodadvances.2025015950. doi:10.1182/bloodadvances.2025015950. Epub ahead of print. Available from: https://pubmed.ncbi.nlm.nih.gov/42747316/
7. Weyand AC, Chaitoff A, Freed GL, Sholzberg M, Choi SW, McGann PT. Prevalence of iron deficiency and iron-deficiency anemia in US females aged 12-21 years, 2003-2020. JAMA. 2023;329(24):2191-3. doi:10.1001/jama.2023.8020
8. Pasricha SR, Tye-Din J, Muckenthaler MU, Swinkels DW. Iron deficiency. Lancet. 2021;397(10270):233-48. doi:10.1016/S0140-6736(20)32594-0
9. Allen RP, Picchietti DL, Auerbach M, Cho YW, Connor JR, Earley CJ, et al. Evidence-based and consensus clinical practice guidelines for the iron treatment of restless legs syndrome/Willis-Ekbom disease in adults and children: an IRLSSG task force report. Sleep Med. 2018;41:27-44. doi:10.1016/j.sleep.2017.11.1126
10. Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. The role of vitamins and minerals in hair loss: a review. Dermatol Ther (Heidelb). 2019;9(1):51-70. doi:10.1007/s13555-018-0278-6
11. Stoffel NU, Cercamondi CI, Brittenham G, Zeder C, Geurts-Moespot AJ, Swinkels DW, et al. Iron absorption from oral iron supplements given on consecutive versus alternate days and as single morning doses versus twice-daily split dosing in iron-depleted women: two open-label, randomised controlled trials. Lancet Haematol. 2017;4(11):e524-33. doi:10.1016/S2352-3026(17)30182-5
12. von Siebenthal HK, Gessler S, Vallelian F, Steinwendner J, Kuenzi UM, Moretti D, et al. Alternate day versus consecutive day oral iron supplementation in iron-depleted women: a randomized double-blind placebo-controlled study. eClinicalMedicine. 2023;65:102286. doi:10.1016/j.eclinm.2023.102286
13. Snook J, Bhala N, Beales ILP, Cannings D, Kightley C, Logan RPH, et al. British Society of Gastroenterology guidelines for the management of iron deficiency anaemia in adults. Gut. 2021;70(11):2030-51. doi:10.1136/gutjnl-2021-325210
14. Cullis JO, Fitzsimons EJ, Griffiths WJH, Tsochatzis E, Thomas DW; British Society for Haematology. Investigation and management of a raised serum ferritin. Br J Haematol. 2018;181(3):331-40. doi:10.1111/bjh.15166
15. MedlinePlus. Iron tests [Internet]. Bethesda (MD): National Library of Medicine (US); [updated 2024 Apr 10; cited 2026 Oct 7]. Available from: https://medlineplus.gov/lab-tests/iron-tests/
16. Linus Pauling Institute Micronutrient Information Center. Subpopulations at risk for micronutrient inadequacy or deficiency [Internet]. Corvallis (OR): Oregon State University; [updated 2026 Jan 2; cited 2026 Oct 7]. Available from: https://lpi.oregonstate.edu/mic/micronutrient-inadequacies/subpopulations-at-risk
17. MedlinePlus. Complete blood count (CBC) [Internet]. Bethesda (MD): National Library of Medicine (US); [updated 2024 Oct 15; cited 2026 Oct 7]. Available from: https://medlineplus.gov/lab-tests/complete-blood-count-cbc/