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Who Should Take Iron Supplements?


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Iron is a nutrient that plays many important roles in your body, including keeping you healthy and full of energy.

Low iron levels are common, and they can cause unpleasant symptoms like tiredness, poor concentration, and frequent bouts of illness. However, iron deficiency is not always easy to spot, especially in its early stages. 

Iron supplements are a great way to reverse a deficiency, especially if diet changes alone are unsuccessful.

This article discusses iron supplements, who may benefit from them, as well as the best ways to get your iron levels tested. 

Symptoms of low iron levels 

Low iron levels are common, especially in certain subsets of the population. If left untreated, they may develop into a more serious condition known as iron deficiency anemia (IDA).

IDA is a condition in which your blood doesn’t contain enough healthy, oxygen-carrying red blood cells. As a result, you may experience the following symptoms:

  • tiredness
  • a lack of energy
  • shortness of breath
  • difficulty concentrating
  • more frequent bouts of illness 
  • difficulty regulating your body temperature or often feeling cold
  • pale skin
  • heart palpitations
  • headaches
  • hearing ringing, hissing, or buzzing noises inside your head
  • itchiness
  • a sore tongue or difficulty swallowing
  • changes in the way food tastes
  • hair loss
  • cravings for non-food items, such as ice or dirt — also known as pica
  • painful open sores in the corners of the mouth
  • spoon-shaped nails
  • an uncontrollable urge to move your legs — also known as restless leg syndrome

If you’re experiencing any of these symptoms, consider discussing diagnostic testing options with your healthcare provider to identify or rule out low iron levels or IDA. 

Keep in mind that these symptoms are typically most noticeable when low iron levels progress to IDA. Thus, you may have low iron levels without experiencing any of these signs, especially in the early stages of iron depletion.

Getting your iron levels tested regularly can be a great way to identify and treat low iron levels before they potentially develop into IDA. 

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When may iron supplements be helpful 

Iron supplements can help reverse low iron levels or treat iron deficiency anemia. They can produce results quicker than diet interventions and are often considered the treatment method of choice.

These supplements can be particularly helpful among people who are prone to low iron levels, especially if they’re unable to maintain a good iron status through diet alone, including:

  • pregnant people
  • infants and young children
  • people experiencing heavy periods
  • frequent blood donors
  • people with cancer
  • people with gastrointestinal disorders, such as celiac disease, ulcerative colitis, or Crohn’s disease
  • those who have undergone gastric surgery
  • people with heart failure
  • those taking iron-depleting medications, such as those used to reduce stomach acid
  • people regularly partaking in heavy exercise
  • those following a vegetarian or vegan diet
  • people with blood disorders, such as thalassemia or sickle cell anemia
  • people with alcoholism

Therefore, always speak to your healthcare professional about getting your or your child’s iron status tested before taking iron supplements, and always follow your healthcare provider’s dosage recommendations. 

Getting tested for low iron 

Getting your blood tested is one of the best ways to diagnose low iron levels or IDA, as the conditions can be difficult to diagnose based on symptoms alone.

One complementary approach is to consider how your dietary and supplemental iron intakes compare with the recommended iron intakes.

To understand the importance of requesting certain blood tests over others, it may be useful to understand the three main stages of iron deficiency.

Stages of iron deficiency

  1. Mild iron deficiency. This condition consists of low iron stores with ferritin levels between 10–30 mcg/L, as well as a normal red blood cell (RBC) count with hemoglobin above 12 g/dL and hematocrit above 36% for women and 41% for men. 
  2. Mild functional iron deficiency. This condition consists of depleted iron stores with ferritin levels lower than 10 mcg/L but a normal RBC count with hemoglobin above 12 g/dL and hematocrit above 36% for women and 41% for men. 
  3. Iron deficiency anemia (IDA). This condition consists of depleted iron stores with ferritin levels lower than 10 mcg/L, plus an RBC count falling below normal range with hemoglobin below 12 g/dL and hematocrit below 36% for women and 41% for men. 

Best tests to diagnose your iron status

Identifying the earlier stages of depletion is beneficial, as doing so allows you to address the problem immediately — be it through diet modifications or supplements — rather than letting it progress to IDA before taking action.

Serum ferritin is currently considered the most cost-effective and efficient test for diagnosing an iron deficiency, especially in its early stages.

However, few medical professionals routinely test for ferritin levels, so you may have to request this test specifically, in addition to hemoglobin and hematocrit tests, when visiting your doctor’s office. 

How often should you get tested?

Those with no history of low iron levels may choose to get their levels tested once per year as a way to detect a potential iron deficiency in its early stages. 

Therefore, people currently taking supplements to treat an iron deficiency should wait at least 3 months after beginning treatment, if not slightly longer, before getting their hemoglobin and ferritin levels retested.

That said, a small proportion of people either do not respond to oral iron supplements or experience side effects. As such, they may need other treatments.


Getting your hemoglobin, hematocrit, and ferritin levels tested is the best way to identify an iron deficiency before it potentially develops into IDA. How often you should get your iron levels tested depends on your current iron status. 

The bottom line

Iron supplements can help reverse an iron deficiency when dietary changes alone are unsuccessful.

Certain people, including pregnant women, infants, young children, heavy exercisers, and those with certain medical conditions are more prone to low iron levels and should get their iron levels tested regularly.

If you’re contemplating getting your iron levels tested, make sure to request a hemoglobin and hematocrit test along with a ferritin test. This combination is most effective at identifying an iron deficiency, even in its early stages.


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