---
title: "How to Raise Ferritin: Target Levels and When Iron Pills Fail"
description: "How to raise ferritin: what counts as low, why it drops, how to take iron tablets, what to do when they fail and what to track. Reviewed by a GP."
canonical_url: "https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin"
md_url: "https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin.md"
last_updated: "2026-11-11"
language: en
---

# How to Raise Ferritin: Target Levels and When Iron Pills Fail

What counts as low, why ferritin drops, how iron tablets are taken, and what happens when they don’t work.

![](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fmaureen-emeagi-headshot-v3.jpg&w=480)

Medically reviewed by [Dr Maureen Emeagi, MBBS MRCGP](https://junocompanion.com/reviewers/maureen-emeagi)10 November 2026

8 min read

## Quick answer

Low ferritin can lead to anaemia. To raise it, find the cause, take iron in a pattern you can tolerate (one tablet a day is the usual start), and have your blood rechecked. If tablets fail or are not tolerated, ask your health provider about an IV iron infusion.

## Key takeaways

-   Ferritin under 24 ng/mL in men and under 11 ng/mL in women usually means low iron stores.
-   One tablet a day of ferrous sulphate (200 mg), ferrous fumarate or ferrous gluconate is the usual start; every-other-day dosing absorbs better in some people and eases side effects. Side effects can include nausea, vomiting, abdominal pain and constipation.
-   Unexplained low iron needs its cause checked. Common causes include heavy periods, pregnancy, a vegan diet and bleeding from the gut.
-   If tablets fail or are not tolerated, the British Society of Gastroenterology says IV iron should be considered rather than persisting with oral iron.
-   A dated log of fatigue, side effects and function across treatment gives the recheck appointment what memory cannot.

Low ferritin can lead to anaemia. Anaemia is low blood levels. Symptoms of anaemia include shortness of breath, tiredness and headaches.[1](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-1)

Find the cause, take iron in a pattern you can actually tolerate, and if tablets fail or are not tolerated, ask your health provider about an IV iron infusion.

## What ferritin level counts as low?

Ferritin is the storage protein that holds your iron reserve, and the blood test for it is the closest thing medicine has to a fuel gauge. The number itself is simple: ng/mL and µg/L are the same unit, so a UK result and a US result read alike.

Guidelines disagree about where low starts: a 2026 review puts the cut-offs in use anywhere from about 12 to 50 ng/mL, and finds that a ferritin below 30 ng/mL is commonly endorsed as diagnostic of iron deficiency when there is no inflammation, precisely because older reference ranges were missing people whose stores were already empty.[2](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-2) Ferritin is also an acute-phase reactant: inflammation raises it, so with a chronic inflammatory illness your stores can be empty while the number reads reassuringly ordinary, and in that setting a ferritin up to 100 ng/mL can still mean deficiency.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) A transferrin saturation test helps decide between true ferritin deficiency and inflammation, because it can flag a false-normal ferritin.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3)

On your result, look at:

-   The ferritin value itself, remembering ng/mL and µg/L are identical units
-   Transferrin saturation, which helps when ferritin looks falsely reassuring
-   The lab’s normal flag, which describes a population range, not a threshold for feeling well

There is a name for this stage: iron deficiency without anaemia, where stores are depleted but haemoglobin still sits inside the reference range. It is estimated to affect 1-2 billion people, and it stays underrecognised because testing often focuses on haemoglobin rather than iron stores. It is associated with fatigue, impaired cognition and reduced exercise capacity, and trials of iron repletion in non-anaemic cohorts show clinically meaningful reductions in fatigue.[2](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-2)

## Why is your ferritin low in the first place?

The most common drivers of low ferritin are heavy periods and pregnancy, and heavy periods can be treated with medicine rather than endured. Bleeding from the gut is the other common route, and it has a long list of possible sources, from everyday painkillers to conditions that need their own care.[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)

| Cause | What it includes |
| --- | --- |
| Periods and pregnancy | Heavy periods and pregnancy, the most common causes |
| Bleeding from the gut | NSAIDs such as ibuprofen and aspirin, stomach ulcers, bowel inflammation, piles, and less commonly bowel or stomach cancer |
| Malabsorption | Including coeliac disease |
| Diet and blood donation | Low dietary intake and frequent blood donation[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) |

Unexplained low iron should always be investigated. In a significant proportion of men and postmenopausal women with iron deficiency anaemia there is an underlying abnormality, most often in the gut, which is why unexplained cases are an accepted indication for fast-track specialist referral in the UK.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) If the reason is not obvious, your GP may test a stool sample for hidden blood, called a FIT test, or refer you to a specialist.[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)

If your haemoglobin is normal and only your ferritin is low, the treatment is more conservative, and often tablets are the way to go.

Symptoms of low ferritin leading to anaemia include:[1](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-1)

-   Shortness of breath
-   Lethargy
-   Headaches
-   Brain fog or cognitive dysfunction
-   Restless legs
-   Irritability
-   Poor concentration
-   Palpitations
-   Tinnitus

## How should iron tablets be taken?

The British Society of Gastroenterology’s starting point is one tablet a day of a standard ferrous salt: sulphate, fumarate or gluconate. If that is not tolerated, the guideline steps to one tablet every other day, a different preparation, or iron by infusion.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) These treatment options should be decided alongside your health care provider.

### Why every other day can absorb better

Iron absorption runs on a hormone called hepcidin. A dose of oral iron raises hepcidin, and that rise can blunt how much you absorb from the next dose for roughly 24 to 48 hours.[2](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-2) In iron-depleted women, a single morning dose every other day delivered 21.8% cumulative absorption, against 16.3% for the same total split across consecutive days.[5](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-5) Less often can lead to better iron absorption with fewer side effects.

## Do vitamin C and iron-rich foods help?

The British Society of Gastroenterology guideline finds vitamin C adds no clear benefit,[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) though the NHS notes that orange juice after a tablet may help absorption.[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4) The CKS guidance advises that if there is a dietary component to iron deficiency, a balanced intake with iron-rich foods such as green leafy vegetables, apricots, meat and raisins should be encouraged.[6](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-6)

What matters more is avoiding tea, coffee, milk, dairy and calcium less than 2 hours before or after the dose, because large amounts make iron harder to absorb.[7](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-7) Taking tablets with or soon after food can soften side effects like constipation, tummy pain and nausea.[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4) And food alone rarely rebuilds a real deficit: diet supports treatment, it does not replace it.

-   Note how you feel in the weeks after any change in dosing pattern, side effects included
-   Keep the dose away from tea, coffee and dairy
-   Expect a response check: a haemoglobin rise of at least 20 g/L within three to four weeks is considered a good response[6](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-6)
-   NHS guidance is usually around six months of tablets, with repeat blood tests over the following months[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)
-   Store tablets out of children’s reach: an overdose of iron in a young child can be fatal[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)

## When do iron pills fail?

There are two ways tablets fail. You could stop taking them because of the side effects: nausea, constipation, tummy pain, heartburn, the kind of side effects that turn every dose into a negotiation. Tablets may also fail if the cause of the blood loss is not adequately investigated and treated, such as heavy periods or blood in the stool.

-   Ongoing blood loss that outpaces what the tablets replace
-   Malabsorption, including undiagnosed coeliac disease or the after-effects of gut surgery
-   Bowel conditions such as inflammatory bowel disease, ulcerative colitis or Crohn’s
-   Ulcers
-   Heavy periods
-   Pregnancy
-   Side effects that make the prescribed pattern impossible to keep up

When oral iron is ineffective, not tolerated or contraindicated, the BSG guideline says parenteral iron, given by infusion, should be considered, and considered early if iron levels need correcting urgently.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) An infusion repletes stores faster than months of tablets, which matters when you are running on empty.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3) For restless legs, much of the evidence base involves infused iron rather than pills: a Cochrane review found iron better than placebo at reducing restless legs severity, with a low to moderate benefit, based mostly on injection studies.[8](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-8)

The decision stays with your clinician. And if you end up needing iron this way, that is not your body failing at a simple task. It is a well-mapped next step for exactly this situation.

## How do you track symptoms while ferritin recovers?

Iron stores rebuild over months, not days. Your GP will schedule a recheck over the following months, and by the time that appointment arrives, three hard weeks and one good weekend have blurred into “still tired, I think”. If you also manage a condition like ME/CFS, POTS or long COVID, tracking may feel more arduous; a paper diary on top is one more job. So keep it small, and keep it dated.

-   A date next to every entry, logged close to when things happen
-   Fatigue type and severity, in your own words
-   Side effects in the days after any change in dosing pattern
-   Restless legs nights, and what the nights cost you
-   Functional impact: what a symptom stopped, delayed or changed

If you would rather start on paper, a free printable [flare log](https://junocompanion.com/free-resources-and-worksheets/flare-episode-log) gives you the same structure offline, and a [treatment tracker](https://junocompanion.com/free-resources-and-worksheets/treatment-tracker) records what each medication change did to you. When the appointment comes, you bring the summary instead of rebuilding the story from scratch, and if [brain fog](https://junocompanion.com/blog/appointments-and-advocacy/medical-appointment-with-brain-fog) makes even that prep feel heavy, there is a guide to preparing for appointments with brain fog.

This is the work [Juno](https://junocompanion.com/) was built to carry. The app quietly logs what you tell it by text or voice, watches for patterns and triggers across the treatment window, and turns your timeline, trends and flare history into a PDF you can review before you share it. You decide what to share, and there is no direct doctor portal: the document goes where you send it. The ferritin number will move when it moves. Tracking it should be easy and timely.

## Frequently asked questions

### What ferritin level is considered low?

Guidelines disagree about where low starts, with cut-offs in use from about 12 to 50 ng/mL. A ferritin below 30 ng/mL is commonly endorsed as diagnostic of iron deficiency when there is no inflammation. With inflammation, a ferritin up to 100 ng/mL can still mean deficiency.[2](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-2)[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3)

### How long does it take for iron tablets to raise ferritin?

Iron stores rebuild over months, not days. NHS guidance is usually around six months of tablets, with repeat blood tests over the following months. A haemoglobin rise of at least 20 g/L within three to four weeks is considered a good response.[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)[6](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-6)

### Why is my ferritin not going up on iron tablets?

Tablets may fail if side effects make you stop taking them, or if the cause of the blood loss is not adequately investigated and treated, such as heavy periods or blood in the stool. Malabsorption, including undiagnosed coeliac disease, is another reason. Talk to your health care provider.

### Is it better to take iron every other day?

It can be. A dose of oral iron raises hepcidin, which can blunt absorption from the next dose for roughly 24 to 48 hours. In iron-depleted women, a single morning dose every other day delivered 21.8% cumulative absorption, against 16.3% on consecutive days. Decide this with your health care provider.[2](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-2)[5](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-5)

### Should I take iron tablets with orange juice?

The British Society of Gastroenterology guideline finds vitamin C adds no clear benefit, though the NHS notes that orange juice after a tablet may help absorption. What matters more is avoiding tea, coffee, milk, dairy and calcium less than 2 hours before or after the dose.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3)[4](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-4)

### When is IV iron used instead of tablets?

When oral iron is ineffective, not tolerated or contraindicated, the BSG guideline says iron given by infusion should be considered, and considered early if iron levels need correcting urgently. The decision stays with your clinician.[3](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin#source-3)

## Tools that go with this article

-   [Free treatment tracker](https://junocompanion.com/free-resources-and-worksheets/treatment-tracker)
-   [Free flare log](https://junocompanion.com/free-resources-and-worksheets/flare-episode-log)
-   [Free energy and fatigue tracker](https://junocompanion.com/free-resources-and-worksheets/energy-fatigue-tracker)
-   [Free symptom tracker](https://junocompanion.com/chronic-illness-support/tracker/symptoms)

## Sources

1.  [NICE Clinical Knowledge Summaries: Anaemia, iron deficiency: signs and symptoms](https://cks.nice.org.uk/topics/anaemia-iron-deficiency/diagnosis/signs-symptoms/)
2.  [Raja NP, Kandagari N. Iron deficiency without anemia: an underrecognized and undertreated clinical condition, with special focus on colorectal cancer. Clinical Hematology International, 2026](https://chi.scholasticahq.com/article/165952-iron-deficiency-without-anemia-an-underrecognized-and-undertreated-clinical-condition-with-special-focus-on-colorectal-cancer)
3.  [Snook J, et al. British Society of Gastroenterology guidelines for the management of iron deficiency anaemia in adults. Gut, 2021](https://pmc.ncbi.nlm.nih.gov/articles/PMC8515119/)
4.  [NHS: Iron deficiency anaemia](https://www.nhs.uk/conditions/iron-deficiency-anaemia/)
5.  [Stoffel NU, 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. The Lancet Haematology, 2017](https://pubmed.ncbi.nlm.nih.gov/29032957/)
6.  [NICE Clinical Knowledge Summaries: Anaemia, iron deficiency: management](https://cks.nice.org.uk/topics/anaemia-iron-deficiency/management/management/)
7.  [NHS: How and when to take ferrous sulfate](https://www.nhs.uk/medicines/ferrous-sulfate/how-and-when-to-take-ferrous-sulfate/)
8.  [Trotti LM, Becker LA. Iron for the treatment of restless legs syndrome. Cochrane Database of Systematic Reviews, 2019](https://pmc.ncbi.nlm.nih.gov/articles/PMC6353229/)

## Turn day-to-day notes into a clearer health story

Juno helps you track symptoms through conversation, notice patterns, and prepare a structured summary for appointments. [Try Juno’s free symptom tracker.](https://junocompanion.com/chronic-illness-support/tracker/symptoms) [Download Juno on the App Store.](https://apps.apple.com/us/app/juno-chronic-illness-support/id6749455368)

[Back to Treatments and medication](https://junocompanion.com/blog/treatments-and-medication)

This article is for general information only and does not replace advice from your own clinician. Juno is a health assistant, not a medical provider.

Last updated 11 November 2026

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Source: [How to Raise Ferritin: Target Levels and When Iron Pills Fail](https://junocompanion.com/blog/treatments-and-medication/how-to-raise-ferritin)