Low iron is one of the most common reasons women feel tired, foggy, and worn down, and it is also one of the most fixable. The catch is that iron is fussy about how it is tested and how it is absorbed. This one-page guide walks through the parts that make the biggest difference. Save it, print it, or keep it on your phone.

Step 1: Get your labs

Before you guess, get the full picture. Ask for:

Iron / TIBC: how much iron is circulating and how much capacity you have to carry it.
Ferritin: your iron storage, and usually the first number to drop.
CBC: shows whether low iron has started to affect your red blood cells.
CRP (bonus): a marker of inflammation. This one matters because high inflammation can falsely raise ferritin, so a “normal” ferritin can hide a real deficiency.

Know your iron types

Not all iron absorbs the same way.

Heme iron is the most absorbable form. It is animal-based, and beef liver supplements are a concentrated source.
Non-heme iron is plant-based and also the form used in most elemental supplements. It has lower bioavailability, so it needs more help to absorb.

For either one, pairing iron with vitamin C (a squeeze of citrus, a bell pepper, a small glass of orange juice) meaningfully boosts absorption.

How to take your supplement

Every other day is often better absorbed than daily dosing, and it is gentler on your stomach.
Take it 1 hour before or 2 hours after meals, on a fairly empty stomach.
If it upsets your stomach, have a light snack only with it rather than a full meal.
Stools may darken. This is normal and not a cause for concern.

Keep these away from your iron

These block absorption, so leave 1 to 2 hours between your iron and:

Dairy and calcium
Coffee and tea
High-fiber foods
Calcium supplements and antacids

Iron-rich foods

Heme sources (best absorbed): beef, lamb, chicken thighs, turkey, liver, oysters, clams, sardines.

Non-heme sources (plant-based): lentils, chickpeas, black beans, tofu, pumpkin seeds, spinach, quinoa, Swiss chard.

How to use this

You don’t need to do everything at once. Start with labs so you know where you stand, then use the timing and pairing tips to get more out of the iron you are already eating or supplementing. Small, consistent changes tend to add up.