How to raise your ferritin: what works and what does not

A low ferritin means your iron stores are running low, and then you want one thing: to get them back up. Why the cause matters more than the list of iron-rich foods, what really determines iron absorption and when tablets are and are not sensible.

First the cause, then the topping up

Raising ferritin without knowing why it is low is mopping with the tap open. Common explanations are blood loss (such as heavy periods), increased demand (growth, pregnancy, intensive sport), a diet low in absorbable iron or reduced uptake in the gut. Each cause asks for its own approach.

Unexplained blood loss deserves particular attention. In men and in women after the menopause, low iron stores are rarely a matter of diet; finding out where the iron goes then matters more than topping up. How to recognise a deficiency is covered in Ferritin too low? How to recognise an iron deficiency.

Iron from food: absorption makes the difference

Iron comes in two forms in food. Haem iron, from meat and fish, is absorbed relatively well. Non-haem iron, from plant sources such as legumes, whole grains, nuts and green vegetables, is absorbed less efficiently but counts fully in a varied diet. What you eat and drink alongside matters most:

• Combine plant-based iron with vitamin C, for example fruit or bell pepper with the meal: that noticeably improves absorption.
• Drink coffee and tea between meals rather than with them; compounds in them inhibit iron absorption.
• A lot of calcium with the same meal can also suppress absorption; spreading it across the day helps.

Do not count on a quick jump: with food alone, low stores rise slowly. Food is the foundation, not a sprint.

Iron tablets: sensible with a demonstrated deficiency

With a clear deficiency, supplementation is the fastest route. Do it guided by a measurement and preferably in consultation with a doctor: dose and duration are more precise than the drugstore shelf suggests, and stomach complaints or constipation are common reasons to adjust the intake.

Just as important: do not take iron for long periods as a precaution without a demonstrated deficiency. Your body can hardly get rid of excess iron, and stores that are too high are not harmless.

How fast does ferritin rise?

Your body first uses incoming iron for daily consumption, such as making red blood cells, and only then refills the stores. So think in months, not weeks. A common approach is topping up consistently for a few months and then measuring again; measuring earlier mainly shows fluctuations.

How you know it is working

For a check-up, measure under the same circumstances as the first time where possible. And mind one pitfall: inflammation can temporarily raise ferritin, making recovery look better than it is. The iron panel therefore measures transferrin saturation alongside ferritin, so a distorted picture stands out sooner.

Frequently asked questions