Can Low Iron Lower Your Sex Drive? What the Studies Actually Show

Low iron and sex drive do seem to be linked in women, though the evidence is thin and nobody has proven that one causes the other. In a small Iranian study of 129 women, those with iron-deficiency anemia scored lower on every part of a sexual-function questionnaire, desire included. In a Turkish before-and-after study of 207 women, scores rose once their anemia was corrected, with no comparison group. The randomized trials of iron in women who were tired but not anemic measured fatigue, and fatigue did ease a little. None of them measured desire.

One thing before anything else: never start iron without a blood test. Ask for ferritin and a full blood count together. Iron that builds up in the body does harm. A 2026 review of people with inherited or transfusion-related iron overload found hypogonadism, a shutdown of sex-hormone output, in 47.0% of 1201 men. That review has no data on supplement users, so read it as a warning about excess iron in general. The test is cheap. A 2023 review calls it "an inexpensive and simple step", and it tells you whether iron is even the question.

Figures from Xiao et al. 2026 (PMID 41926767), Nikzad et al. 2018 (PMID 30521614) and Houston et al. 2018 (PMID 29626044). The first two are cross-sectional; the third pools a small number of trials.

Tired all the time, and no desire to speak of

You drag yourself through the day, fall asleep on the sofa, and sex is the last thing on your mind. Someone online says it's your iron. It's a fair question, especially if you bleed heavily, had a baby in the last year, eat little or no meat, or give blood often.

The internet answer is usually confident: low iron kills libido, take iron, desire comes back. The studies are smaller and more mixed. They support a link between anemia and lower sexual-function scores in women. They cannot show that iron raises desire in women who are low on iron without being anemic, because those trials never asked about desire.

Two lab words matter here. Hemoglobin is the oxygen-carrying protein in red blood cells, and a low hemoglobin means anemia. Ferritin is a marker of stored iron. A normal blood count can sit alongside low ferritin, and many studies on this page enrolled women in exactly that gap. If you want the wider picture of what flattens desire in women, our guide to low libido in women walks through the usual suspects.

How common low iron is in women who still menstruate

Very common. Xiao and colleagues (2026) pooled US national survey data on 8,200 nonpregnant women aged 20 to 45 years, from 1999 to 2023. Using a strict cut-off, a ferritin level less than 15.0 micrograms/L, 17.3% had iron deficiency (95% CI 16.4 to 18.3%). That is about 5.70 million women. Anemia rose over the period from 8.0% to 14.2%, and iron-deficiency anemia from 4.3% to 9.1%. Iron deficiency itself held roughly steady, moving from 17.9% to 18.8%.

The figure depends on where you draw the line. Singh and colleagues (2026) used the World Health Organization's 2020 thresholds, adjusted for inflammation, on 3322 women aged 18 to 49 from 2015-2023. Among 3156 nonpregnant women, 27.4% had iron deficiency and 8% had iron-deficiency anemia. Obesity went with higher odds of iron deficiency (aOR 2.4, 95% CI 1.86 to 3.24). Both studies are cross-sectional snapshots, so they count how many women are low. They say nothing about how those women feel.

Periods are a large part of the story. A 2023 review names abnormal uterine bleeding as a common cause of iron deficiency in women. If your drive also rises and falls with your cycle, our piece on sex drive across the menstrual cycle separates the monthly rhythm from a drop that sticks around.

What the studies in women with anemia found

The clearest comparison comes from Nikzad and colleagues (2018), in Mahshahr, Iran. They compared 129 women aged 18 to 45: 52 with iron-deficiency anemia and 77 without. Hemoglobin, serum iron and ferritin were lower in the anemia group (p<0.01), as expected. On the Female Sexual Function Index, every domain, desire items included, scored lower in women with anemia (p<0.001). So did sexual satisfaction. The blood markers tracked the questionnaire scores, except for the pain domain against hemoglobin and ferritin.

Keep it in proportion. It is one small observational study from one town. The summary gives no mean scores, so you cannot tell how big the gap was, and it does not say whether mood, sleep, heavy bleeding or relationship stress were accounted for. A woman worn down by anemia may also be worn down by the bleeding that caused it. The study shows the two travel together. It cannot show the anemia came first.

The before-and-after evidence comes from Gulmez and colleagues (2014), a study its own title calls preliminary. They enrolled 207 women with iron-deficiency anemia at a family medicine clinic in Turkey, mean age 33.6. The women filled in an anxiety inventory, the same sexual-function questionnaire and a quality-of-life form, before and after their anemia was corrected. Their blood markers improved. Anxiety scores fell, and sexual-function scores rose (P < 0.001). Quality of life improved too, though without statistical significance.

That sounds strong until you look at the design. There was no control group and no placebo, and anxiety dropped over the same stretch. The summary leaves out the form of iron, the dose, the duration, the actual scores and any desire-only result. It is a reason to check iron when desire is low and you feel wiped out. It does not prove that iron lifts desire.

Two more studies complicate the picture. Keşkek and colleagues (2020), also in Turkey, compared 87 women with beta-thalassemia minor, an inherited trait that often causes only mild anemia, with 96 healthy women. Sexual-function scores were lower in the trait group, 19.1 versus 25.2 (p < 0.001). This is a different kind of anemia from iron deficiency, and the authors pointed to metabolic problems such as insulin resistance as the likely drivers.

Then the null result. Hartmann and colleagues (2019) ran a small pilot study in Switzerland with 45 healthy middle-aged women, measuring ferritin and hemoglobin alongside questions on sexuality. Their empirical findings "failed to demonstrate any correlation" between iron deficiency and sexual problems. Menopausal status mattered more. It is a pilot, too small to settle anything, and the one study here that looked in a general group of women and came up empty.

The review often quoted online, Serati and colleagues (2023), summarised a 2022 symposium and concluded that the two are related. It contains no new data, and one author lists a company affiliation. Its testing advice is sound. Its confidence runs ahead of the studies underneath it.

The iron trials measured fatigue, and only fatigue

This is where the best evidence sits, and it answers a narrower question. These trials enrolled tired women with low ferritin and no anemia, and asked whether iron eased the tiredness. None asked about sex.

Verdon and colleagues (2003) ran a double-blind trial in Swiss primary care. 144 non-anaemic women aged 18 to 55, with unexplained fatigue, took oral ferrous sulphate, 80 milligrams of elemental iron a day, or a placebo for four weeks. Fatigue on a 10 point scale fell by 29% on iron and 13% on placebo, a difference of 0.95 points (95% CI 0.32 to 1.62). Only women with ferritin at or below 50 micrograms per litre improved. It was one month long, the scores were self-rated, and the ferritin result came from a subgroup.

Vaucher and colleagues (2012) repeated the test in 198 French women aged 18-53 with fatigue, ferritin below 50 ug/L and hemoglobin above 12.0 g/dL, for 12 weeks at the same iron dose. Fatigue scores fell 47.7% on iron and 28.8% on placebo (difference -18.9%, 95% CI -34.5 to -3.2). Quality of life, depression and anxiety did not change significantly. Women could tell which pill they had, so expectation may have played a part.

The intravenous trials tell a similar story with more caveats. Krayenbuehl and colleagues (2011) gave 90 premenopausal women with fatigue and ferritin at or below 50 ng/mL either 800 milligrams of intravenous iron or a placebo. Over 6 weeks, fatigue fell 1.1 points on iron and 0.7 on placebo (P = .07), which missed significance. The gain showed up only in women with ferritin at or below 15 ng/mL: 82% improved on iron versus 47% on placebo. Side effects ran 21% versus 7%, none serious.

Favrat and colleagues (2014), in the PREFER trial, gave 290 fatigued women with low iron a single infusion of 1000 milligrams of iron or saline. Fatigue fell in 65.3% on iron and 52.7% on placebo (OR 1.68, 95% CI 1.05 to 2.70). That trial was industry-funded, with a company employee among the authors. It was single-blind, and over half the placebo group improved too.

The pooled reviews agree on direction and size. Houston and colleagues (2018) pooled randomized trials in adults who were iron deficient without anemia. Self-reported fatigue fell, SMD -0.38 (95% CI -0.52 to -0.23), across only 4 trials and 714 participants, and physical capacity did not change. Yokoi and colleagues (2017) found a significant effect across 6 trials, though in the same paper the population link between low iron and fatigue was not significant. Modest relief from tiredness, in women who were actually low, is a fair summary.

Mood, sleep and focus: the links in between

Desire runs on energy, mood, sleep, safety and wanting the person in front of you. The useful question is whether low iron touches any of those, and how well each link has been tested.

Mood first. Fiani and colleagues (2025) pooled 18 studies of iron in people who were not anemic, mostly menstruating adults with a mean age of 34.6. In the placebo-controlled trials, iron improved anxiety (d = 0.34), fatigue (d = 0.34) and short-term memory (d = 0.53), but not depression or attention. The uncontrolled before-and-after studies showed bigger gains, including depression at d = 0.93, as studies with no comparison group tend to. The effects disappeared when people without iron deficiency were analysed alone, so any benefit seemed to depend on actually being low.

Gupta and colleagues (2025) pooled observational studies of depression in people with any kind of anemia and found a prevalence of 36% (95% CI 28 to 45%), with 20% in iron deficiency anemia. There was no comparison group, so the review counts how often the two overlap. It cannot say anemia raises the risk. Low mood and low desire feed each other, and our piece on depression and low libido covers that loop.

Sleep next. Restless legs, the urge to move your legs at night, is linked to low iron in some people. Trotti and colleagues (2019), in a Cochrane review of 10 trials, found iron improved restless legs scores versus placebo (MD -3.78, 95% CI -6.25 to -1.31), at moderate certainty. Subjective sleep quality did not differ, SMD 0.19 (95% CI -0.18 to 0.56). One study of 110 people found less daytime tiredness on a single item. If nights are broken for any reason, how sleep shapes libido is worth a read.

So the chain people describe, from low iron to tiredness to low mood to no desire, is part tested and part guesswork. Fatigue and anxiety showed small benefits. Depression and sleep quality showed no difference in the controlled trials. Desire in women who are not anemic has never been tested.

After a baby, and when periods are heavy

New mothers are a special case. Blood loss at birth, broken nights and a body still recovering all stack up. Moya and colleagues (2022) reviewed 27 studies on anemia after birth. In 7 observational studies, iron-deficient or anemic new mothers were 1.66 times more likely to report depression (RR 1.66, 95% CI 1.28 to 2.16). In 3 randomized trials, iron lowered fatigue scores (MD -1.85, 95% CI -3.04 to -0.67). The depression link is observational, there were only 3 trials for fatigue, and the review did not look at desire.

Low desire after a baby is common for reasons that have nothing to do with iron, from sleep loss to feeding to a body that feels borrowed. Anemia is one thing worth ruling out, especially after heavy bleeding at delivery. If periods are heavy or irregular month after month, that is worth raising too, and our piece on PCOS and sex drive covers one common cause of irregular cycles.

Six studies, six different questions

Read side by side, the studies show where the gaps are.

Low iron and desire, link by link: the best evidence, what it found, and whether desire itself was measured.

Link	Best evidence	Result	Desire measured?
Anemia and sexual-function scores	Nikzad 2018, 129 women	Every domain lower with anemia (p<0.001)	Yes, as one domain; observational
Correcting anemia	Gulmez 2014, 207 women	Overall score rose (P < 0.001)	No desire-only result; no control group
Low iron in healthy women	Hartmann 2019, 45 women	No correlation found	Not reported separately; pilot
Iron and fatigue, no anemia	Houston 2018, 4 trials, 714 participants	SMD -0.38 (95% CI -0.52 to -0.23)	No
Iron and mood	Fiani 2025, 18 studies	Anxiety d = 0.34 in trials; no change in depression in trials	No
Iron and sleep	Trotti 2019, 10 trials	Restless legs improved; sleep quality SMD 0.19 (95% CI -0.18 to 0.56)	No
Iron in men	Mehta 2018, 25 men	Testosterone improved after anemia was corrected (p<0.01)	No

Low iron in men is a question for a doctor

Men rarely run low on iron without a reason, and the reason matters more than the number. A low result in a man is a cue to see a doctor and find out why. It is never a cue to pick up a supplement.

The one study we found on iron and male sex hormones is small. Mehta and colleagues (2018) followed 25 men in India with untreated iron-deficiency anemia, given intravenous iron and retested 6 weeks later. Mean hemoglobin went from 5.66 to 11.96 gm/dl, which means these men started out very anemic. Testosterone, two pituitary hormones and sperm measures all improved (p<0.01), most in the men who started low. There was no control group, and the study did not ask about desire or sex at all.

Excess iron matters for men too: in the 2026 overload review, erection problems commonly came with the hypogonadism. Nobody should take iron on a hunch. For the wider picture, see our guide to low libido in men.

"My numbers are fine and I still feel flat"

This is the most common version of the story. You had blood work, someone said it was normal, and you still feel flat. Sometimes normal means a hemoglobin in range with nobody checking ferritin. The studies above drew different lines: 50 micrograms per litre in one trial, 15 ng/mL in another, and less than 15.0 micrograms/L in the US survey. With no single agreed number, your own doctor needs to read yours.

A few specifics help at the appointment.

1. Ask for ferritin and a full blood count together, and ask for the actual numbers.
2. Bring your bleeding history: how heavy, how many days, and whether it has changed.
3. Mention anything that cuts iron intake or raises loss, such as a vegetarian diet, giving blood or a recent birth.
4. Ask whether thyroid function was checked, since an underactive thyroid also brings tiredness and low drive.
5. Describe your sleep, your mood and how long desire has been low.
6. If iron is prescribed, ask how long to take it and when the blood test will be repeated.

If your iron comes back fine, that rules one thing out. Our piece on normal labs and low libido covers what to look at next, and the thyroid and low libido explains the thyroid side in more depth.

Where a botanical fits, and what it cannot do

Start with what NUUD is not for. NUUD does not fix, correct or address iron deficiency or anemia in any way, and its formula contains no iron. If your ferritin is low, the answer is a conversation with your doctor about iron. Our label also carries a caution, quoted here word for word: avoid use if you are on blood pressure medication, have cardiovascular, renal, or pulmonary conditions, or if you are sensitive to any of the ingredients.

A few ordinary things move desire in most people, and the free ones do more work than the internet admits.

• Sleep, in quantity and quality, since tiredness drains wanting faster than almost anything.
• Food that covers the basics, and our piece on zinc, vitamin D and libido looks at two more nutrients people ask about.
• Care for your mood, named out loud and taken as seriously as your labs.
• Time with a partner, or alone, with nothing expected at the end.
• A botanical supplement, if you want one, as the smallest lever on the list.

NUUD is a botanical supplement built around desire in general. The formula is anchored by the NUUD Mushroom Complex™, with Muira Puama, Boiled Rehmannia Root, Tribulus Terrestris, and Piper Nigrum for absorption. Onset is roughly 30 to 60 minutes. If you take blood-pressure medication or have a heart, kidney or lung condition, the label says no. If your iron has been checked and your doctor has no objection to the label, that is what our women's libido gummies and women's libido capsules are for. There is a men's version too.

Nothing is wrong with you

If you are tired all the time and your drive is nowhere to be found, that is a signal worth listening to. Blaming yourself misreads it. Low iron is common and easy to check. If it is low, there is a clear next step with your doctor. If it is fine, you have ruled something out.

Low desire rarely has a single cause. Heavy periods, a new baby, broken sleep, a stressful job and a relationship on autopilot can pile up at once. None of that means something in you is broken. It means you are carrying a lot.

If you just want to feel normal again, start with the plain things. Get the blood test. Protect your sleep. Say out loud to someone that you miss wanting sex. The wanting is often still there, waiting for the tiredness to lift.

Frequently asked questions

Can low iron lower your sex drive?
It may, though the evidence is small and observational. In one Iranian study of 129 women, those with iron-deficiency anemia scored lower on every part of a sexual-function questionnaire, desire included. In a Turkish study of 207 anemic women, scores rose after the anemia was corrected, with no control group. A Swiss pilot of 45 healthy midlife women found no correlation at all. Low iron can leave you tired all the time, and tiredness drains desire, but no trial has tested iron against desire directly.

Does iron deficiency cause low libido?
Nobody has shown that it does. The studies show an association between anemia and lower sexual-function scores in women, and an association cannot tell you which came first. Heavy bleeding, anxiety, poor sleep and low mood often travel with low iron and could explain part of the link. The randomized trials in women with low ferritin but no anemia measured fatigue, and iron eased it a little. They never asked about desire, so the honest answer is that the cause has not been tested.

Will taking iron bring my sex drive back?
If you are not low on iron, there is no reason to expect it to, and taking it untested is unsafe. If you are low, iron may ease tiredness: across 4 trials and 714 participants, self-reported fatigue fell modestly. One uncontrolled study of 207 anemic women saw sexual-function scores rise after the anemia was corrected, while anxiety fell at the same time. Get ferritin and a full blood count first, and let your doctor decide whether iron is the next step.

What ferritin level counts as low iron?
There is no single agreed number, and your doctor should read yours. The studies on this page drew different lines. A large US survey defined iron deficiency as a ferritin level less than 15.0 micrograms/L. One Swiss trial found that only women at or below 50 micrograms per litre felt less tired on iron. An intravenous iron trial found the benefit only at or below 15 ng/mL. Ask for the actual number and how your lab defines its range.

Can I take NUUD if my iron is low?
Ask your doctor first, and bring the label. NUUD contains no iron and does not fix, correct or address iron deficiency or anemia in any way. If your iron is low, that needs its own plan with your doctor. NUUD is a botanical supplement built around desire in general. No interaction studies exist for this formula. Its label says to avoid use if you are on blood pressure medication, have cardiovascular, renal, or pulmonary conditions, or if you are sensitive to any of the ingredients.

References

1. Nikzad Z, Iravani M, Abedi P, Shahbazian N, Saki A (2018). The relationship between iron deficiency anemia and sexual function and satisfaction among reproductive-aged Iranian women. PloS one. PMID 30521614.
2. Gulmez H, Akin Y, Savas M, Gulum M, Ciftci H, Yalcinkaya S, Yeni E (2014). Impact of iron supplementation on sexual dysfunction of women with iron deficiency anemia in short term: a preliminary study. The journal of sexual medicine. PMID 24754331.
3. Houston BL, Hurrie D, Graham J, Perija B, Rimmer E, Rabbani R, Bernstein CN, Turgeon AF, Fergusson DA, Houston DS, Abou-Setta AM, Zarychanski R (2018). Efficacy of iron supplementation on fatigue and physical capacity in non-anaemic iron-deficient adults: a systematic review of randomised controlled trials. BMJ open. PMID 29626044.
4. Carlomagno F, Tenuta M, Sansone A, Rastrelli G, Sciarra F, Cangiano B, Isidori AM, Gianfrilli D, Krausz C (2026). Iron overload disorders in adults: a comprehensive review of gonadal function, reproductive, and sexual health. Human reproduction update. PMID 42101252.
5. Xiao MZX, Bentley J, Leavitt AD, Butwick AJ (2026). Trends in Anemia and Iron Deficiency Among Nonpregnant U.S. Women of Reproductive Age, 1999-2023. Obstetrics and gynecology. PMID 41926767.
6. Singh P, Saad-Omer S, Galvez C, Gupta S (2026). Iron Deficiency and Iron-Deficiency Anemia Among Reproductive-Age Women in the United States: Prevalence and Disparities, 2015-2023. Anemia. PMID 42662160.
7. Keşkek ŞÖ, Demirtaş D, Uysal G, Başaran E (2020). Sexual dysfunction in female subjects with beta-thalassemia minor. International journal of impotence research. PMID 32341453.
8. Hartmann CJ, Sutter B, Fehr M, Stute P (2019). Impact of body iron store on sexual function: a comprehensive review and pilot cohort study in midlife women. Archives of gynecology and obstetrics. PMID 31172305.
9. Serati M, Espuña-Pons M, Mouton-Puglisi A, Padoa A (2023). Iron deficiency and sexual dysfunction in women. Sexual medicine reviews. PMID 37433756.
10. Verdon F, Burnand B, Stubi CL, Bonard C, Graff M, Michaud A, Bischoff T, de Vevey M, Studer JP, Herzig L, Chapuis C, Tissot J, Pécoud A, Favrat B (2003). Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial. BMJ (Clinical research ed.). PMID 12763985.
11. Vaucher P, Druais PL, Waldvogel S, Favrat B (2012). Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial. CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne. PMID 22777991.
12. Krayenbuehl PA, Battegay E, Breymann C, Furrer J, Schulthess G (2011). Intravenous iron for the treatment of fatigue in nonanemic, premenopausal women with low serum ferritin concentration. Blood. PMID 21705493.
13. Favrat B, Balck K, Breymann C, Hedenus M, Keller T, Mezzacasa A, Gasche C (2014). Evaluation of a single dose of ferric carboxymaltose in fatigued, iron-deficient women: PREFER a randomized, placebo-controlled study. PloS one. PMID 24751822.
14. Yokoi K, Konomi A (2017). Iron deficiency without anaemia is a potential cause of fatigue: meta-analyses of randomised controlled trials and cross-sectional studies. The British journal of nutrition. PMID 28625177.
15. Fiani D, Chahine S, Zaboube M, Solmi M, Powers JM, Calarge C (2025). Psychiatric and cognitive outcomes of iron supplementation in non-anemic children, adolescents, and menstruating adults: A meta-analysis and systematic review. Neuroscience and biobehavioral reviews. PMID 40945632.
16. Gupta B, Goel R, Satodiya V, Gupta K, Mittal A (2025). Association of Anaemia and Depression: A Systematic Review and Meta-analysis. Nigerian medical journal : journal of the Nigeria Medical Association. PMID 41472978.
17. Trotti LM, Becker LA (2019). Iron for the treatment of restless legs syndrome. The Cochrane database of systematic reviews. PMID 30609006.
18. Moya E, Phiri N, Choko AT, Mwangi MN, Phiri KS (2022). Effect of postpartum anaemia on maternal health-related quality of life: a systematic review and meta-analysis. BMC public health. PMID 35189871.
19. Mehta S, Goyal L, Meena ML, Gulati S, Sharma N, Harshvardhan L, Jain G, Mehta S (2018). Assessment of Pituitary Gonadal Axis and Sperm Parameters in Anemic Eugonadal Males Before and After Correction of Iron Deficiency Anemia. The Journal of the Association of Physicians of India. PMID 31321929.

This article is for general education and is not medical advice. Iron deficiency and anemia are medical conditions that only a licensed clinician can diagnose and manage, and iron should only be taken after a blood test and with your doctor's guidance. NUUD is a botanical supplement and has no role in diagnosing, treating, curing, or preventing iron deficiency, anemia, or any other disease, and these statements have not been evaluated by the Food and Drug Administration. Talk with your doctor before starting any new supplement.