Taking Iron Supplements But Your Ferritin Is Still Low? Here's Why

"I've been iron deficient my whole life. I don't think it'll ever change."

One of the most common things I see as a Naturopath and Nutritionist is women who have been taking iron supplements for months, sometimes YEARS, but their ferritin barely moves.

And while iron supplementation can absolutely help, taking iron doesn't automatically mean you're absorbing it or addressing why your levels are low in the first place.

Here's what I want you to know.

1. Your iron supplement might not be right for you

Not all iron supplements are created equal.

Different products contain different forms and amounts of elemental iron, and the way you take them can significantly influence absorption.

Interestingly, higher doses aren't always better.

Larger doses of oral iron can increase hepcidin, a hormone that temporarily reduces iron absorption. This is one reason why dosing frequency and timing can be just as important as the amount you're taking.

The goal isn't necessarily to take more iron. It's to find the right formulation, dose and schedule for your individual needs.

2. You might be losing iron faster than you're replacing it

Heavy menstrual bleeding is one of the most common contributors to iron deficiency in women.

But it's not the only possibility.

Frequent blood donation, gastrointestinal blood loss and other underlying conditions can contribute to ongoing iron depletion.

If your ferritin improves with supplementation but drops again shortly afterwards, it's important to investigate why.

3. Your gut might not be absorbing iron effectively

Iron absorption primarily occurs in the small intestine.

Conditions such as coeliac disease, gastrointestinal inflammation and certain digestive disorders can affect how well your body absorbs iron.

Some medications, including acid-suppressing medications, may also reduce the absorption of particular iron formulations.

If you're consistently taking iron without seeing improvement, absorption is worth investigating.

4. Your blood tests might not be telling the full story

One of my biggest frustrations is seeing women told their iron is "normal" because their haemoglobin is within range.

You can have depleted iron stores without being anaemic.

Ferritin helps us understand stored iron, while haemoglobin tells us about the oxygen-carrying capacity of your red blood cells.

I also like to review transferrin saturation, transferrin, serum iron and the full blood count together.

Ferritin can also increase during inflammation, meaning interpretation isn't always as straightforward as looking at one number.

5. Your iron intake and absorption habits matter

Small changes can make a difference.

Pairing plant-based iron sources with vitamin C can improve non-haem iron absorption, while tea and coffee consumed alongside iron-rich meals can reduce it.

Calcium supplements can also interfere with iron absorption when taken at the same time.

And while foods like red meat, legumes, tofu and pumpkin seeds can help maintain healthy iron intake, food alone may not be enough to correct established iron deficiency.

So, what should you do if your ferritin isn't improving?

Rather than continuing the same supplement indefinitely, it's worth reviewing your full iron studies, current supplement, dosing schedule, dietary intake and potential causes of ongoing iron loss.

Persistent iron deficiency deserves proper investigation, particularly when levels aren't responding to treatment.

Download my FREE Iron Deficiency Guide

I've put together a free guide called Why Is My Iron Still Low? to help you understand your results and what might be getting in the way of improving your iron stores.

Inside, we cover the key blood markers, iron absorption, common supplement mistakes and the iron formulas I regularly recommend in clinic.

DOWNLOAD YOUR FREE IRON GUIDE → 

Want help understanding your blood results?

Not quite ready for a full naturopathic consultation?

My Blood Test Interpretation Report is a great place to start.

For $69, I'll review your existing bloodwork from the past six months and provide a written interpretation to help you understand your results and identify areas worth investigating further.

EXPLORE BLOOD TEST INTERPRETATION →

You can also browse my Low Iron & Iron Support Collection to explore some of the iron supplements available at Shay Health Hub.

Emma x

Emma Shay | Naturopath & Nutritionist | Shay Health Hub, Shorncliffe, Brisbane