You're exhausted. Your hair is falling out. You feel cold all the time, struggle to concentrate, and get breathless climbing stairs. You go to your GP, get a blood test — and you're told everything looks normal.
Sound familiar? You may be experiencing iron deficiency without anaemia — one of the most common and most overlooked conditions affecting women in New Zealand.
What Is Iron Deficiency Without Anaemia?
Most doctors test for anaemia by measuring haemoglobin — the protein in red blood cells that carries oxygen. But iron depletion begins long before haemoglobin drops. Your body prioritises red blood cell production above all else, so it will quietly drain iron from your tissues, muscles, and organs to keep haemoglobin in the normal range.
By the time anaemia shows up on a blood test, your iron stores have often been depleted for months — sometimes years.
The key marker to ask for is serum ferritin — the storage form of iron. Many labs flag ferritin as "normal" at levels as low as 12–15 µg/L, but clinical research suggests optimal ferritin for symptom resolution is closer to 50–100 µg/L.
Who Is Most at Risk?
- Women with heavy or prolonged periods
- Pregnant or postpartum women
- Vegetarians and vegans
- Endurance athletes
- People with gut conditions affecting absorption (coeliac, IBD, low stomach acid)
- Regular blood donors
Symptoms to Watch For
Iron deficiency without anaemia can present with a wide range of symptoms that are easy to dismiss or attribute to stress or poor sleep:
- Persistent fatigue and low energy, even after rest
- Brain fog and difficulty concentrating
- Hair thinning or increased shedding
- Cold hands and feet
- Restless legs, especially at night
- Shortness of breath on exertion
- Brittle nails and dry skin
- Mood changes, anxiety, or low mood
- Reduced exercise tolerance
Getting the Right Test
If you suspect iron deficiency, ask your healthcare provider for a full iron panel, not just a full blood count. This should include:
- Serum ferritin — your iron stores
- Serum iron — circulating iron
- Transferrin saturation — how much iron is being transported
- TIBC (Total Iron Binding Capacity) — capacity to carry iron
A ferritin below 50 µg/L in the presence of symptoms warrants attention, even if haemoglobin is normal.
Dietary Sources of Iron
Iron comes in two forms: haem iron (from animal sources, highly bioavailable) and non-haem iron (from plant sources, less readily absorbed).
Haem iron sources: red meat, liver, oysters, sardines, chicken thigh
Non-haem iron sources: lentils, chickpeas, tofu, pumpkin seeds, dark leafy greens, fortified cereals
To enhance non-haem iron absorption, consume it alongside vitamin C-rich foods (e.g. capsicum, citrus, kiwifruit). Avoid tea, coffee, and calcium-rich foods within an hour of iron-rich meals, as these inhibit absorption.
When Diet Isn't Enough: Supplementation
For many women, dietary changes alone are insufficient to restore depleted iron stores — particularly if absorption is compromised or losses are ongoing. This is where targeted supplementation becomes important.
Not all iron supplements are equal. Common forms like ferrous sulphate are poorly tolerated, causing constipation, nausea, and gut irritation. Gentler, highly bioavailable forms include:
- Iron bisglycinate — chelated iron with superior absorption and minimal side effects
- Ferric pyrophosphate — well tolerated and suitable for sensitive stomachs
- Liposomal iron — encapsulated for enhanced absorption without GI upset
Supplementation should always be guided by a healthcare professional and monitored with follow-up testing. Iron overload is possible and carries its own risks.
Supporting Absorption
Even with the right supplement, absorption can be undermined by gut dysfunction. If you have low stomach acid, gut inflammation, or a history of digestive issues, addressing these underlying factors is essential for iron repletion to succeed.
Key co-factors for iron metabolism include vitamin C, vitamin A, copper, and B vitamins — all of which support red blood cell production and iron utilisation.
The Bottom Line
Iron deficiency without anaemia is real, common, and frequently missed by standard blood panels. If you're experiencing unexplained fatigue, hair loss, brain fog, or any of the symptoms above — and you've been told your bloods are fine — it's worth digging deeper.
Ask for a full iron panel including ferritin, work with a practitioner who understands functional reference ranges, and consider whether your current supplement form is actually being absorbed.
Our dispensary stocks practitioner-grade iron formulations selected for bioavailability and tolerability. Browse our dispensary or speak with our team for personalised guidance.