Low iron is rarely about iron

For 30 years I've watched the same story play out. Iron tablets or an infusion, ferritin climbs for a few months, then quietly falls again. That's because chronic low iron isn't usually a lack of iron. It's a regulation problem — and copper, magnesium and nitric oxide sit at the centre of it.

Iron is everywhere

By mass, iron is the most abundant element on Earth. Most Australians and New Zealanders eat several times more than the body needs to absorb.

More importantly, we recycle it. Red blood cells live for about 120 days, and when they retire, immune cells called macrophages return their iron to build new ones. That recycling supplies around 20–25mg of iron a day. From food, we only need to replace 1–2mg.

So the body isn't short of iron. The question is why it can't use what it has.

Iron gets stuck, not lost

The gatekeeper is a liver hormone called hepcidin. When hepcidin is high, the gates close: absorption drops and iron gets locked inside storage cells.

The biggest driver of high hepcidin is inflammation — the slow, everyday kind that comes with poor metabolic health, gut problems, stress, poor sleep and ageing blood vessels. The blood test says low iron, but the iron hasn't gone anywhere. Taking more iron is delivering more stock to a warehouse with the doors shut.

It's also why ferritin can mislead. Ferritin rises with inflammation too, so a normal ferritin doesn't mean the body can actually use its iron.

The three keys

Copper: the key that releases iron

Iron can only travel in the blood once it has been converted by two copper enzymes — hephaestin in the gut, and ceruloplasmin from the liver. Without enough copper, iron gets stuck in the gut lining, the liver and the macrophages. Copper deficiency can look almost identical to iron deficiency on a blood test, and it doesn't respond to iron. Long-term zinc supplements and high-dose iron both push copper down.

Magnesium: the power behind the system

Copper is loaded into ceruloplasmin by a pump that runs on ATP, and ATP only works bound to magnesium. Magnesium also protects red blood cells, helps calm inflammation and supports nitric oxide production. It's one of the most under-consumed minerals in the modern diet.

Nitric oxide: the regulator

Nitric oxide signals directly to the iron sensors inside every cell, helps keep inflammation — and hepcidin — in balance, and delivers the oxygen iron carries. By around 40, most adults make roughly half the nitric oxide they did at 20. When inflammation comes down, minerals rebalance and circulation improves, iron so often sorts itself out.

Why more iron isn't the answer

Iron tablets and infusions have their place, but they're not benign. Most of a high-dose tablet isn't absorbed; the rest can disturb the gut and microbiome. Each large dose raises hepcidin for about 24 hours, blocking the next one, and high-dose iron competes with copper. Infusions bypass the gatekeeper entirely and some commonly lower blood phosphate. Neither changes why regulation failed — which is why so many people end up back for more.

When it really is about iron: heavy periods, pregnancy, coeliac disease, blood donation and bleeding from the gut must always be ruled out with your doctor. If you've been prescribed iron, don't stop it without talking to them.

What's in the protocol

1. Test, don't guess — the full panel that shows why iron is low
2. Rule out genuine iron loss
3. Lower the inflammatory load
4. Restore magnesium
5. Restore copper
6. Include retinol
7. Optimise nitric oxide
8. Use iron wisely
9. Retest at 8–12 weeks

Plus a daily checklist and a results tracker you can print.

Jeff Butterworth N.D — Specialist Naturopath, 30 years in clinical practice

This information is for general education and is not a substitute for individual health advice. Always work with your health professional to investigate low iron, and do not stop or change prescribed treatment without speaking to them.