Iron

What is it?

Iron is a mineral that is essential for the proper functioning of the body. It plays a vital role in the production of red blood cells and the transportation of oxygen throughout the body.

How does it work for medicinal purposes?

Iron works for medicinal purposes by assisting in the production of hemoglobin and myoglobin, proteins responsible for carrying oxygen in the blood and muscles, respectively. It also plays a role in various enzymatic reactions and supports a healthy immune system.

What are the active ingredients that are important for its medicinal properties?

The active ingredient in iron supplements is usually ferrous sulfate, ferrous gluconate, or ferrous fumarate. These compounds provide the elemental iron necessary for the body's physiological processes.

What forms does it come in?

Iron comes in various forms, such as tablets, capsules, liquid, and even intravenous injections for severe deficiencies or specific medical conditions.

What if I have an imbalance or deficiency?

An iron deficiency can lead to anemia, a condition characterized by fatigue, weakness, pale skin, and shortness of breath. In severe cases, it can cause heart problems, growth and development issues in children, and complications during pregnancy.

When was it first used for medicinal purposes?

Iron has been used for medicinal purposes for centuries. Ancient Egyptians, Greeks, and Romans recognized the importance of iron and used it to treat various ailments.

What does Iron help with?

Iron is a mineral your body needs to build red blood cells. Those cells carry oxygen to every part of you. People take it as pills, liquid drops or, at times, a drip.

• Low iron anemia (low red blood cell counts)
  Strong evidence — many human trials of oral iron in people with iron-deficiency anemia. This is the use iron supplements were built for. In trials, oral iron raised hemoglobin and red blood cell counts, most often within 6 to 8 weeks. Pale skin, breathlessness and deep tiredness eased as counts came back up.
  Evidence grade A · Traditional tier T3
• Iron needs in pregnancy
  Strong evidence — large, consistent human trials in pregnancy; one of the most studied steps in maternal care. Iron needs nearly double in pregnancy, since the body makes much more blood for the baby and placenta. Low iron in pregnancy has been linked to preterm birth, low birth weight and tiredness after birth. Trials of iron in pregnancy are among the strongest in maternal health.
  Evidence grade A · Traditional tier T3
• Growth and brain development in babies and young children
  Strong evidence — consistent human studies in children who were low in iron. Low iron in early life has been linked to slower thinking, weaker motor skills and poorer school work. In children who were deficient, iron supplements improved these outcomes across studies. Some of the early effects can last even after iron levels are fixed.
  Evidence grade A · Traditional tier T3
• Feeling drained and low on energy
  Good evidence — human trials in people who were iron-depleted but not yet anemic. Iron is well established as part of how cells make energy, though that is general nutrition science. In trials of people with low iron stores and no anemia, iron cut fatigue and improved daily function. Our file does not list the trial sizes or doses for this use.
  Evidence grade B · Traditional tier T3
• Restless legs at night
  Good evidence — human trials of oral and IV iron in people with low ferritin. In people with low ferritin (stored iron), both oral iron and IV iron lowered restless legs severity in trials. Low brain iron has been strongly linked to this problem, even when blood tests look near normal. Iron is known to help the body make dopamine, a brain signal chemical; that is basic biology, not trial proof.
  Evidence grade B · Traditional tier T3
• Brain fog and trouble focusing
  Good evidence — human studies in people who were iron deficient. In deficient people, iron improved attention, memory and speed of thinking in studies. The gains looked largest in women of childbearing age and in teens. Brain tissue is known to use a lot of oxygen, which is general biology rather than trial data.
  Evidence grade B · Traditional tier T3
• Stamina and sports performance when iron is low
  Good evidence — human studies in athletes with iron deficiency. Endurance athletes and women lose extra iron through sweat and foot-strike hemolysis, where red cells break during running. In iron-deficient athletes, fixing the shortfall raised VO2 max, a measure of fitness. Effort felt easier, and time to exhaustion got longer.
  Evidence grade B · Traditional tier T3
• Heavy monthly periods
  Early evidence — smaller human studies in women with heavy blood loss; no trial sizes on file. Women who lose a lot of blood each month are among the groups most likely to run low on iron. Studies show that regular iron helps replace what each cycle takes away. Steadier energy, mood and focus in the weeks after a heavy period are less firmly proven.
  Evidence grade C · Traditional tier T3
• Thinning hair linked to low iron
  Long traditional use · not yet tested in trials — mostly observed links between low ferritin and thinning hair; few treatment trials. Low ferritin shows up often in women with diffuse hair thinning. That link comes from observation, not from strong treatment trials. Building iron stores back up may slow or turn around this type of loss, but the human proof is weak.
  Evidence grade D · Traditional tier T3

What Iron has not been shown to do

• Iron has not been shown to lift energy in people whose iron stores are already normal.
• It has not been shown to work as a general immune booster; too much iron can itself harm immune defense.
• It has not been shown to help hair loss that is not caused by low iron.
• In athletes with normal iron, extra iron has not been shown to improve performance.
• Iron given later has not been shown to undo all the effects of low iron in early childhood.
• It is not a general tonic: the gains in these studies came from fixing a shortfall, not from taking extra.

How to read this:

The grades rate the evidence, not the strength of the pill. A means many human trials agree. B means at least one good human trial. C means small or mixed human studies. D means the human evidence is weak or clashing. Insufficient means no human study is on file. This page lists options, not advice, and it is not a diagnosis. A blood test is what shows whether you are low. Too much iron is harmful, and iron pills are a leading cause of poisoning in young children.

What can Iron help prevent?

• Iron-deficiency anemia in high-risk groups (pregnant women, infants, menstruating women with heavy periods)
• Cognitive impairment in iron-deficient children and adolescents
• Low birth weight and preterm birth when iron deficiency is corrected in pregnancy
• Exercise-induced performance decline in iron-depleted athletes

Which foods are rich in it?

Top 10 foods rich in iron include:

• Red meat (e.g., beef, lamb)
• Liver and other organ meats
• Shellfish (e.g., clams, oysters)
• Legumes (e.g., lentils, chickpeas, beans)
• Spinach and other leafy greens
• Fortified cereals and grains
• Tofu
• Pumpkin seeds
• Quinoa
• Dark chocolate

What are possible side effects?

Iron is generally well-tolerated, but side effects can occur, including:

Mild side effects (10-20% occurrence): constipation, diarrhea, nausea, stomach pain, and heartburn.

Rare side effects (<1% occurrence): allergic reactions, black or tarry stools, and vomiting.

What's the recommended daily dose?

Recommended daily dosage for adult men is 8 mg, while for adult women, it's 18 mg (age 19-50) and 8 mg (age 51+).

How many days does it take to work?

The number of days to see improvement depends on the individual and the severity of the deficiency, but most people experience improvements within 1-2 weeks of consistent supplementation.

What time of day is best to take it?

Iron supplements can be taken at any time of day, but absorption may be better when taken on an empty stomach.

Is it best to take it with or without food?

It is best to take iron supplements on an empty stomach, as this can enhance absorption. However, some people may experience gastrointestinal side effects such as nausea, stomach pain, or heartburn when taking iron without food. In such cases, taking the supplement with a small amount of food may help alleviate these side effects. Additionally, it is advisable to avoid consuming iron supplements with dairy products, tea, or coffee, as they may reduce iron absorption.