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Feosol® FAQ


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About Feosol

  • When is the best time to take Feosol®?

    Feosol®  is best taken with water or other beverage on an empty stomach, about one hour before or two hours after meals. Iron in the form of ferrous sulfate is most efficiently absorbed in the absence of food. However, to lessen the possibility of stomach upset, Feosol®  may be taken with food or immediately after meals. Some foods, such as coffee, tea or milk, interfere with the absorption of ferrous iron, but orange juice can increase it.  Since oral iron products interfere with absorption of certain antibiotics, these products should not be taken within two hours of each other.

  • Should you take Feosol® with fluid? If so, how much?

    Iron is best absorbed when taken with an 8 oz glass of water or juice on an empty stomach.

  • How long does it take for Feosol® to dissolve in the stomach?

    Feosol® will dissolve in approximately 20-30 minutes.

  • Where is the iron absorbed?

    Iron, whether from food sources or supplements, is absorbed at mucosal sites in the upper intestine.

  • Are the Feosol caplets or tablets time released?

    No, none of the Feosol® Iron Supplements are time released.

  • Can the Feosol® caplets and tablets be crushed for easier swallowing?

    Yes, Feosol  tablets and caplets can be crushed for easier swallowing. The coating on the tablets and caplets is not a functional coat; therefore it does not enhance or impede dissolving of the product.

  • Can I take more than the recommended dose of Feosol®?

    It is important that you take Feosol® according to the directions on the packaging, unless otherwise directed by your physician. 

  • What is the difference between the Carbonyl Iron and the ferrous Sulfate?

    Carbonyl Iron Caplets - Carbonyl iron is pure iron micro particles. It is 100% elemental iron and may be gentler on the system then iron salts.* Each Carbonyl Iron Caplet contains 45mg of elemental iron.

    Ferrous Sulfate Tablets - Ferrous Sulfate is an iron salt. It is 20% elemental iron and is the type of iron most familiar to doctors, making it the most commonly recommended. Each Ferrous Sulfate Tablet contains 65mg of elemental iron.

  • What is elemental iron?

    Elemental iron is the amount of iron in a supplement that is available for absorption.

  • What are the most commonly reported side effects of using Feosol®?

    Feosol® contains iron which may produce side effects such as constipation, diarrhea, nausea, stomach cramps, or upset stomach. If any of these effects persist or worsen, contact your doctor or pharmacist. In addition iron may cause your stools to turn black due to unabsorbed iron in the intestines. Some individuals may experience local throat pain and heartburn due to possible contact irritation from the iron and its preparation.

  • Can I take Feosol® with other medications or if I have a specific medical condition?

    Ask your health care provider regarding any specific medical conditions or if Feosol® may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.


    Iron should not be given with antacids because they may decrease the absorption of iron. Also since oral iron products interfere with absorption of certain antibiotics, these products should not be taken within two hours of each other.

  • Is the iron in Feosol® Tablets and Caplets Heme or Non-Heme?

    The iron in Feosol® Tablets and Caplets is non-heme. Heme is a natural form of iron derived from animal sources. The iron source used in the tablets is Ferrous Sulfate, a mineral, and the iron source used in the Caplets is Carbonyl Iron.

  • Can I be tested for anemia?

    If you are concerned about iron deficiency anemia, talk to your healthcare provider. He or she may assess the iron in your blood with two common blood tests:
    1. A test to measure the hemoglobin in your blood
    2. A hematocrit to determine the percent of red blood cells in your blood


    If your hemoglobin and your hematocrit are low, you may have iron deficiency anemia. Your healthcare provider will rule out serious health problems that could have caused low iron in your blood, and discuss ways you can get rid of your iron deficiency.

  • Can you overdose on Feosol®?

    Yes, you can overdose on iron products such as Feosol®. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under age 6. In case of accidental overdose, call a doctor or call poison control center immediately. Treatment is effective if instituted early enough and should be sought immediately if overdose is suspected.

  • How much elemental iron do Feosol® products contain?

    Feosol Caplets contain 45 mg of elemental iron per caplet and Feosol® Tablets contain 65 mg of elemental iron.

  • What is the source of iron in Feosol®?

    Feosol® Caplets contain Carbonyl iron.


    Feosol® Tablets contain Ferrous Sulfate.

  • What do you mean by "pure iron micro particles" on the Feosol® Caplet package?

    The source or iron in Feosol® Caplets is carbonyl iron. Carbonyl iron is a very fine powder that has to be absorbed onto a carrier and is therefore referred to as "pure iron micro particles." The definition of pure in regards to carbonyl iron means that all of the iron is elemental iron, it is pure iron.

  • How can 200mg. of dried Ferrous Sulfate be the same as 325 mg. of Ferrous Sulfate?

    Ferrous Sulfate weighs more than dried Ferrous Sulfate because it contains a few molecules of water. It does not weigh more because it contains more iron; they both contain the same amount of iron. An analogy would be potato flakes which are light before you add water and much heavier after they become mashed potatoes even though they contain the same about of “potato”.