What to do about iron deficiency? Your practical guide to more energy

12. Juli 2025 ca. 21 Minuten

At its core, treating iron deficiency is about specifically replenishing depleted iron stores. The way to do this is through two key pillars: an iron-rich diet, ideally combined with vitamin C for better absorption, and, if needed, taking iron supplements recommended by a doctor.

Understanding iron deficiency: More than just a little tired

Do you often feel sluggish and unfocused for no apparent reason? Have you perhaps even noticed that your hair is thinning or your nails are splitting? These signals from your body are often more than just the result of a demanding week. They can be classic signs of iron deficiency - a condition that affects your quality of life far more than you might think.

Iron is much more than just a mineral on a nutrition label. It’s an essential trace element responsible for countless processes in the body. Without enough iron, your cells can’t transport oxygen, your immune system can’t operate at full capacity, and your muscles can’t produce energy.

The ignition key to your energy

Imagine your body as a highly complex engine. Every single cell is a tiny power plant that must constantly produce energy so you can think, move, and simply live. In this picture, iron is the ignition key. Without it, the engine won’t start properly. Hemoglobin, the red pigment in blood, absolutely needs iron to carry oxygen from the lungs to every cell in your body.

Without this key, the whole engine only sputters or runs in emergency mode. You feel the result right away: exhausted and drained, with barely enough focus to concentrate. This fatigue is often the first and best-known symptom, but the effects of a deficiency go much further.

"Iron deficiency isn’t inevitable; it’s a treatable condition. Recognizing the symptoms is the first step toward regaining your energy and zest for life."

More than just fatigue

While persistent exhaustion is the most prominent sign, your body often sends other, subtler signals too. It’s important to watch out for these as well to piece together the puzzle. Unrecognized iron deficiency can show up in many ways:

Pale skin and mucous membranes: A quick look in the mirror or at the inside of your lower eyelids can reveal a lot. If they look unusually pale, it could be a sign.
Hair loss and brittle nails: When iron is lacking, the body starts conserving resources in less vital areas. Hair and nails are often the first to suffer.
Shortness of breath during exertion: If even climbing stairs becomes a challenge, impaired oxygen transport could be the cause.
Headaches and dizziness: Your brain also needs enough oxygen to function optimally. A deficiency can quickly become noticeable here.
Restless legs syndrome: This unpleasant tingling sensation or urge to move your legs, especially when resting, is often associated with iron deficiency.

Knowing these symptoms is essential. They help you interpret your body’s signals correctly and not simply dismiss them as a “bad day.”

Who is particularly at risk?

Although anyone can develop iron deficiency, some groups are at significantly higher risk. In Germany, iron deficiency is one of the most common nutrient deficiencies, with women particularly affected. Approximately 58% of women are affected, compared with only around 14% of men. This large difference is primarily due to monthly blood loss during menstruation, which significantly increases iron requirements. You can find more information about prevalence on Wikipedia.

If you suspect your symptoms may point to a deficiency, an iron or ferritin self-test can provide a helpful initial indication before you make a doctor’s appointment. These at-home nutrient tests quickly and easily give you an initial insight into your nutrient levels and help you stay on top of your health.

Why your ferritin level is your most important indicator

When it comes to iron deficiency, terms like hemoglobin and ferritin are often mentioned. But what do they really tell you about your energy and well-being in everyday life? It’s incredibly important to understand that not every value tells the same story. Long before iron deficiency shows up as low hemoglobin on a standard blood test, there’s a much earlier and more meaningful warning sign: your ferritin level.

Just think of the iron in your body as money. Hemoglobin is your checking account - the money you use every day for your expenses. It transports oxygen and keeps everything running. Your ferritin level, on the other hand, is your savings account. It’s the quiet reserve your body only draws on when it doesn’t get enough replenishment from food.

So an emerging iron deficiency doesn’t start with your checking account; it quietly and unnoticed drains your savings account first. Your hemoglobin level can still be completely within the normal range. You may look perfectly healthy on a standard blood test, even though your reserves are already running dangerously low.

Your body’s fuel gauge

Perhaps an even better analogy is your car’s fuel gauge.

Hemoglobin is basically the running engine. As long as there’s still a drop of gas in the system, it runs - maybe not quite smoothly, but it runs.
Ferritin is the fuel gauge itself. It shows you precisely how much reserve you really have left before the engine starts sputtering and eventually gives out completely.

Classic iron-deficiency anemia is often diagnosed only when the engine is already sputtering (that is, when hemoglobin is low). But the warning light (low ferritin) starts flashing much, much earlier. And you may already feel that flashing as constant fatigue, difficulty concentrating, or hair loss. That’s why ferritin is by far the most important indicator for detecting a deficiency in time and taking action before things get serious.

So if you want to know what to do about iron deficiency, you first need to know how full your storage tank is. Without your ferritin level, you’re in the dark.

What is a really good ferritin level?

Now things get interesting, because “normal” is not the same as “optimal.” Many labs give very generous reference ranges. But the truth is that even a value in the lower third of this official range can cause severe symptoms. For women between 18 and 45 years old, the normal ferritin range is often between 6.5 and 131 µg/l. Yet values below 50 µg/l can already cause noticeable exhaustion, even though they are still formally considered “normal.” You can read more about these reference ranges in this article on vitalarzt-marquardt.de.

For this reason, many experts in functional medicine recommend target levels that are significantly higher. The goal is not just to prevent a deficiency, but to achieve genuine vitality.

Below 30 µg/l: This is considered an absolute deficiency. Iron stores are depleted.
Between 30 and 50 µg/l: A gray area where many people already experience noticeable symptoms.
Between 70 and 100 µg/l: For most people, this is the optimal range for feeling good, having energy, and performing at your best.

These levels give you a much better point of reference when you have your blood test results in hand. Don't settle for a level that only just puts you above the deficiency threshold! To dive deeper into what the numbers mean, also read our comprehensive article on optimal ferritin levels.

Knowing your personal ferritin level empowers you to take proactive steps. An iron-ferritin self-test can be the first, simple step toward finally getting clarity. Instead of waiting until you're completely burned out, you can find out early whether your “fuel gauge” is flashing and take the right steps.

The path to diagnosis: how to shed light on the issue

Do you recognize yourself in these symptoms and suspect that there's more behind your constant fatigue than everyday stress? Good! This suspicion is the very first and most important step. But what now? Instead of continuing to guess and going around in circles, it's time to get clarity and take control of your levels.

The path to diagnosis doesn't have to be complicated. I know from personal experience how liberating it is to take the first, concrete step. For me, it was a simple test that finally pointed me in the right direction and prompted me to take a closer look. Today, you have two fantastic options for getting answers, and they complement each other perfectly.

Your first step toward understanding your levels: the self-test

Fortunately, you no longer have to wait weeks for a doctor's appointment to get an initial assessment of your iron levels. An at-home iron or ferritin test is a great way to quickly and easily get an initial overview. These tests are designed to be simple to do yourself - usually, all it takes is a small finger prick.

The benefits are clear:

Speed: You often get your result within just a few days, without having to wait ages for an appointment.
Discretion: You can take the test easily and privately in the comfort of your own home.
Taking responsibility: A test like this is a powerful tool. You take control instead of simply waiting passively.

Of course, a test like this is no substitute for a complete medical diagnosis, but it is an invaluable guide. If the iron-ferritin self-test shows a low level, you have solid evidence to help you have a focused conversation with your doctor. You take proactive action instead of simply reacting.

A self-test is like a first look at the map of your health. It shows you where you are and helps you decide which route to take next.

When a doctor’s visit is essential

A self-test is the perfect starting point, no question. But a visit to the doctor is essential for a definitive diagnosis and, above all, to investigate the underlying cause. Especially if the test indicates a deficiency or your symptoms are severe, don’t hesitate to make an appointment.

A doctor can not only confirm iron deficiency but also—and this is crucial—uncover its underlying cause. Is it due to your diet? Is there an undiscovered loss of blood in the gastrointestinal tract? Or is chronic inflammation blocking iron absorption? These questions need to be professionally investigated to find a lasting solution.

To be fully prepared for your doctor’s appointment, you should know exactly which values really matter. There’s much more to it than just the ferritin level.

How to request a complete blood count

Ask your doctor for a comprehensive blood test that goes beyond standard screening. This is the only way to get a complete picture of your iron status. It’s best to write down the following values to make sure everything important is checked:

Ferritin: As you know, this is your most important value. It shows how full your iron stores are.
CRP (C-reactive protein): This value is extremely important! It is an inflammation marker. Inflammation in the body can cause ferritin levels to be falsely high, even when a deficiency is present. A low CRP confirms that your ferritin level is truly meaningful.
Hemoglobin (Hb): This value shows whether anemia is already present.
Transferrin and transferrin saturation: These two values indicate how well iron is transported in the body. Low saturation is a clear sign of a deficiency.

With these results in hand, you can decide together what to do to address your iron deficiency. If you’d like to learn more about how to test for nutrient deficiencies in general, you’ll find more valuable information in our guide. Our goal is to give you the knowledge you need to actively and confidently manage your health.

Your shopping list for more energy

Okay, the diagnosis is in. That’s the first and most important step. But what now? How do you replenish your depleted iron stores and make sure they stay full?

In cases of a truly severe deficiency, iron supplements are often unavoidable—but that’s for your doctor to decide. In the long term, though, a carefully planned, iron-rich diet remains your strongest weapon. It’s the most sustainable strategy not only for replenishing your iron stores, but also for restoring your everyday energy.

But which foods are the real iron heroes? And—almost more importantly—how can you make sure your body actually absorbs this valuable trace mineral? Don’t worry, it’s easier than it sounds. Let’s put together your shopping list for more energy.

Not all iron is the same: What your body really needs

Before we head for the shelves, there’s one important distinction we need to know. Your body can handle two different types of iron, and that makes a huge practical difference.

Heme iron: Think of it as a “VIP pass” for your body. It comes exclusively from animal sources such as meat and fish. The big advantage: Your body can absorb it easily and directly.
Non-heme iron: This is the form of iron found in all plant-based foods, as well as in eggs and dairy products. It’s a little trickier to absorb, but with a few clever tricks, we can significantly improve how well your body uses it.

The top iron sources for your diet

Let’s focus on the foods that give you the biggest iron boost. Even small changes on your next grocery trip can make a huge difference.

Animal-based iron power (heme iron):

Beef and liver: Red meat, especially lean beef, is a true classic. Liver is the undisputed champion, but because of its high vitamin A content, it should only be on the menu from time to time.
Poultry (dark meat): Chicken thighs or turkey legs contain significantly more iron than white breast meat. An easy choice with a big impact.
Fish and seafood: Tuna and sardines are great, but oysters and mussels are the real stars when it comes to iron content.

Plant-based iron heroes (non-heme iron)

Legumes: Lentils (whether red, brown, or green), chickpeas, and black beans are nutritional powerhouses and extremely versatile.
Nuts and seeds: Pumpkin seeds, sesame (as tahini in hummus), and flaxseeds are fantastic sources of iron for your muesli, salads, or simply as a snack.
Whole grains: Oats, millet, and quinoa are a solid foundation for an iron-conscious diet.
Green leafy vegetables: Spinach, kale, and Swiss chard are good choices, but they also contain substances (oxalates) that slightly reduce absorption. That’s why the right pairing is crucial here.
Dried fruit: Dried apricots or figs make an ideal, iron-rich snack when you’re a little hungry between meals.

Clever helpers and stealthy thieves

Knowing the best sources of iron is only half the battle. The real key to success is maximizing absorption while avoiding the “iron thieves” that can thwart your efforts.

By far the most important helper for plant-based iron is vitamin C. It acts like a turbocharger and can increase absorption many times over. The rule is simple: always pair your iron-rich meals with a source of vitamin C.

At the same time, there are substances that can effectively block iron absorption. These include tannins (in coffee and black tea), calcium (in dairy products), and phytates (in whole grains).

Practical tip: Don’t drink coffee or black tea with your meal; it’s better to wait an hour. The same goes for a glass of milk or yogurt for dessert. Give your body time to absorb the iron first.

The following graphic gives you an overview of the common causes of iron deficiency.

As you can see, it’s not always just about diet. Menstruation plays a key role, especially for women, and explains why their iron requirements are often higher.

Iron-rich foods and what to pair them with

To help you get started, I’ve put together a table. It shows you not only top sources of iron, but also how easy it is to boost absorption by pairing them with vitamin C-rich foods.

Iron source (animal-based/plant-based)	Iron content per 100 g (approx.)	Perfect pairing (source of vitamin C)	Preparation tip
Beef tenderloin (animal-based)	2.5 mg	Fresh bell pepper salad	Serve the steak with a side of steamed broccoli or red bell pepper.
Red lentils (plant-based)	7.5 mg	A glass of orange juice or lemon juice in the dressing	Cook a delicious lentil soup and add a generous squeeze of fresh lemon juice at the end.
Pumpkin seeds (plant-based)	8.8 mg	Fresh berries (e.g., strawberries, raspberries)	Top your morning muesli with a handful of pumpkin seeds and fresh berries.
Spinach (plant-based)	2.7 mg	Tomatoes or a squeeze of lemon	Make yourself a green smoothie with spinach, an orange, and a spoonful of flaxseeds.

This list is just the beginning and is meant to inspire you. The principle is always the same: combine foods wisely and keep the blockers at a distance. That way, your diet becomes your strongest weapon against fatigue and helps you feel noticeably more energetic in everyday life.

How to use iron supplements correctly and avoid side effects

Sometimes iron stores are so depleted that even the best diet can’t keep up. If your doctor has confirmed a clear deficiency, iron supplements are often the fastest and most effective way to replenish those empty stores and get your energy back. I know from personal experience: after my diagnosis, it was targeted supplementation that finally banished the debilitating fatigue.

But the supplement market is a real jungle. Finding the right product, and above all knowing how to take it, is crucial. When used incorrectly, iron supplements can cause quite unpleasant side effects or simply not work. But don’t worry, I’ll show you what matters.

Which iron compound is right for you?

When you look at different iron supplements, you’ll quickly come across terms like iron sulfate, gluconate, or bisglycinate. These are simply different chemical “packaging” for iron, and that packaging determines how well your body can absorb it and how well you tolerate it.

Iron sulfate: This is the classic - tried and tested, and inexpensive. It works, but it is also notorious for its side effects. Many people complain of nausea, stomach pain, or constipation and give up taking it out of frustration.
Iron gluconate: This form is considered a little gentler on the stomach than sulfate, but it can still cause digestive problems in sensitive people.
Iron bisglycinate: My personal favorite and also recommended by many experts. Here, the iron is bound to two amino acids. This clever trick protects it as it passes through the stomach and helps it reach the small intestine much more effectively - with significantly fewer side effects.

Practical tip: If you have a sensitive stomach or simply want to make sure your body uses the iron optimally, iron bisglycinate is usually the best choice. Even if it costs a few euros more, the improved tolerability is often worth the investment.

The golden rules for taking it

The best supplement won’t help if you take it incorrectly. To maximize absorption and be gentle on your stomach, there are a few simple but extremely important rules. They’re the key to how much of this valuable iron actually gets into your body.

Always take it on an empty stomach: It’s best to take your iron tablet 30 to 60 minutes before breakfast. That way, no other foods interfere with absorption.
Combine it with vitamin C: A small glass of orange juice or simply water with a squeeze of lemon is perfect. Vitamin C is the ultimate boost for iron absorption.
Keep your distance from iron blockers: Wait at least two hours after taking iron before having coffee, black tea, dairy products, or whole-grain products. These contain substances that bind to iron and carry it out of the body unused.
Caution with other minerals: Don’t take iron supplements at the same time as zinc, magnesium, or calcium. They compete for the same transport pathways in the gut.

Following these rules consistently helps your body get the most out of every dose and avoid unpleasant side effects.

How long to take it and the importance of checkups

When it comes to “What should I do about iron deficiency?”, patience is key. Taking the tablets for just a few weeks isn’t enough. Even if you may feel more energetic after a short time, replenishing your deep stores (your ferritin levels) is a marathon, not a sprint. Depending on the severity of the deficiency, it can easily take three to six months or even longer.

That’s why one thing is absolutely non-negotiable: medical supervision. Never take iron on your own for an extended period.

An iron overdose can be harmful. Regular blood tests every 8–12 weeks are essential to monitor your ferritin level and adjust the dose. This helps ensure you replenish your iron stores without going too far in the other direction.

Medical supervision is essential, especially for chronic diseases that can cause blood loss, such as Crohn's disease or ulcerative colitis. You can find more information about treating iron deficiency in inflammatory bowel diseases on norgine.de. In fact, around 7 to 13 per 1,000 person-years in Germany are affected by iron deficiency, with women and older people at higher risk.

By the way, iron deficiency rarely occurs on its own. It's often useful to keep an eye on other nutrients, too. In our guide, you'll learn how to recognize and treat a vitamin B12 deficiency, as these two nutrients work closely together in blood formation.

Frequently asked questions about iron deficiency

Do you still have questions about iron deficiency? Perfect, because the more you know about it, the better you can look after yourself and your health. I've gathered the most frequently asked questions here and answered them briefly so you can get an overview quickly.

How quickly will I notice an improvement after taking iron?

Patience is your best friend here, but the first improvements often come sooner than you might think. Many people report that the debilitating fatigue and lack of motivation noticeably ease after just two to three weeks. You simply feel more alert and have more energy for everyday life.

However, that's just the beginning. Fully replenishing your depleted iron stores—that is, raising your ferritin level into an optimal range—is a marathon, not a sprint. Depending on your starting point and dosage, expect three to six months or sometimes even longer. Sticking with it is the key to long-term success.

Should I take iron supplements on suspicion, without a blood test?

A clear and resounding no. I can't stress this enough: never take iron supplements based only on a vague suspicion. As vital as iron is for us, too much can harm the body and put strain on the organs. This is known as iron overload.

Supplementation should always be based on a well-founded diagnosis through a blood test. An iron-ferritin home test is a great first step toward getting clarity. However, the final decision about the dosage and duration of use should always be made in consultation with your doctor to be on the safe side.

What role does iron deficiency play for athletes?

For anyone who trains regularly, good iron levels aren’t just important - they’re essential for performance. Think of iron as the star of the show when it comes to oxygen transport. It carries oxygen throughout your body via hemoglobin in your blood, and directly to your muscles via a protein called myoglobin.

A deficiency has these concrete effects on you:

Less endurance: Your muscles don’t get enough oxygen and tire much faster.
Reduced performance: You simply don’t have the energy for intense training sessions.
Slower recovery: Your body takes longer to recover after exercise.

So if you’re stuck at a performance plateau despite training hard or constantly feeling exhausted, you should definitely get your ferritin levels checked. The question “What should I do about iron deficiency?” is one of the key questions for athletes who want to succeed in training.

Can I get all the iron I need from plant-based foods?

Yes, absolutely! It’s a persistent myth that a vegetarian or vegan diet automatically leads to iron deficiency. It just takes a little more know-how and careful planning when cooking and eating. The key is choosing the right combinations.

Plant-based iron (non-heme iron) is absorbed a little less efficiently than animal-based iron. But with a simple trick, you can boost absorption many times over: always pair iron-rich plant-based foods such as lentils, tofu, pumpkin seeds, or oats with a source of vitamin C.

A few simple examples from everyday life:

Lentil salad with a dressing made from fresh lemon juice.
Oatmeal porridge with a handful of berries.
Enjoy whole-grain bread with hummus and a red bell pepper.

At the same time, try to have “iron blockers” such as coffee, black tea, or dairy products about an hour apart from your meals. So the question isn’t whether to get enough iron from plant-based foods, but how. Fatigue isn’t always just about iron; to get the full picture, read our article about nutrient deficiencies that cause fatigue and low energy.

Are you ready to take the first step and finally get clarity about your iron levels? With the MYBODY Lab GmbH iron and ferritin self-test, you can quickly and easily find out where you stand. Order your test kit straight to your home, take the test, and receive a scientifically sound analysis from our ISO-certified lab. Take control of your health - get started now at https://mybody-x.com.