Ferrous Fumarate, Sulfate and Gluconate: What Is the Difference?
These iron salts contain different amounts of elemental iron—the iron available in the dose. The “300 mg” on a product name does not mean 300 mg of elemental iron. Check the label before comparing products or changing doses.
Why Do People Need Iron?
Iron is an essential mineral for human growth and development. Red blood cells carry oxygen from the lungs to every part of your body using hemoglobin, a protein produced by using iron. Iron is also necessary for the protein myoglobin, which supplies muscles with oxygen.
The amount of iron you need depends on your age, sex, diet, and other factors. Discuss your diet and iron needs with your clinician before starting a supplement. When consumed by food, iron is available in two forms. The two forms of iron are heme and non-heme. Heme iron is only naturally found in animal proteins, including lean meat, seafood, and poultry.
You can find non-heme iron in plant foods and iron-fortified foods. Some plant-based foods full of iron are white beans, lentils, spinach, kidney beans, and peas.
Iron deficiency can lead to anemia. People who eat little or no meat can obtain iron from plant foods and fortified foods; a clinician can help assess whether their intake and iron status are adequate.
How Should I Take Ferrous Fumarate?
Follow your prescribed or package instructions. If stomach upset makes treatment difficult, ask about taking it with food or changing the schedule. Iron can interact with other medicines and supplements; ask your pharmacist how to separate them. Keep iron away from children.
Source: NHS ferrous fumarate guidance.
Do I Need Testing?
Tiredness alone does not diagnose iron deficiency. A clinician can arrange appropriate blood tests and investigate causes such as blood loss, low intake or poor absorption. Discuss supplements before starting them.
A clinician can assess whether blood tests or treatment are appropriate for your symptoms.
Source: HealthLink BC.
What Is Ferrous Fumarate 300mg?
Ferrous fumarate is an iron salt used in supplements and medicines for iron deficiency. Check the package for its elemental iron content and follow the instructions for the exact product.
What Is Ferrous Sulfate 300mg?
Ferrous sulfate (or sulphate) is a medicine used to treat and prevent iron deficiency. Ferrous sulfate comes as tablets, or as drops that can be swallowed. There are modified-release tablets and capsules of ferrous sulfate, but they may not be absorbed as well.
What Is Ferrous Gluconate 300mg?
Ferrous gluconate is an iron salt used for iron deficiency. A 300 mg amount contains less elemental iron than the same salt weight of ferrous fumarate. Tolerability depends on the elemental dose, product and person; gluconate is not automatically better tolerated at equivalent elemental doses.
Compare Elemental Iron
Illustrative amounts for 300 mg of the iron salt:
- Ferrous fumarate: about 99 mg elemental iron (33%)
- Ferrous sulfate: about 60 mg (20%)
- Ferrous gluconate: about 36 mg (12%)
These are calculations from approximate salt percentages, not a product-specific prescribing table. The actual package label takes priority.
Source: NIH Office of Dietary Supplements.
Which Iron Supplement Should I Choose?
The choice depends on the elemental dose, how well you tolerate it and your treatment plan. More elemental iron can cause more stomach-related side effects. Your clinician or pharmacist can help compare products; do not switch tablet-for-tablet based only on the salt’s milligram amount.
Are There Other Supplements for Iron Deficiency Anemia?
There are other supplements you may take for iron deficiency. There are heme-based iron supplements on the market. In addition, there are polysaccharide-iron complex formulas available.
If oral iron is not tolerated or is ineffective, your clinician can reassess the dose, adherence and cause of deficiency. IV iron may be appropriate in selected situations.
A vegan or vegetarian diet does not automatically require an iron supplement. Include iron-containing foods such as lentils, beans, tofu and fortified cereals, and discuss supplementation if your intake, risk factors or test results indicate a need.
Those concerned about taking these iron deficiency medications should know that not all capsule shells are vegan. It is important to check the capsule’s ingredients to ensure they are.
Connect With an Online Doctor About Iron Deficiency
It is difficult to get through daily life with an iron deficiency – it makes life more challenging as you have to battle through fatigue. If you have risk factors for iron deficiency, it is best to see a doctor.
A clinician can assess whether iron deficiency is present, investigate the cause and discuss treatment and follow-up. Symptoms such as fatigue can have other causes.
Treatment depends on your symptoms, test results and the cause of any deficiency.
See a Virtual Doctor about Iron Deficiency Treatment
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