Feosol Natural Release FAQ

What is the type of iron in Feosol® Natural Release?

feosol natural release iron

The typeof iron in Feosol® Natural Release caplets is a form of iron called carbonyl iron, which is a non-heme iron. Carbonyl iron is a very fine powder often referred to as micro-particles.

Carbonyl iron is also sometimes referred to as “pure iron” because it is entirely elemental iron. That means the iron present is 100% available for absorption by your body.

What’s the difference between carbonyl iron and ferrous sulfate?

While both forms of iron are available from Feosol in high potency doses, these two irons are absorbed differently by the body:

  • Carbonyl iron (found in Feosol® Natural Release):
    feosol natural release iron

    Carbonyl iron is 100% elemental iron and is gentler on the system than iron salts, such as ferrous sulfate. The absorption is regulated naturally by the body, so it may be prolonged. Each carbonyl iron caplet contains 45 mg of elemental iron, which is the iron available for absorption.

  • Ferrous sulfate (found in Feosol® Original):
    feosol original iron

    Ferrous sulfate is an iron salt, and it is 20% elemental iron. For many years, ferrous sulfate has been the type of iron most familiar to doctors, making it the most commonly recommended. Each ferrous sulfate tablet contains 65 mg of elemental iron, which is the iron available for absorption.

How much elemental iron does Feosol® Natural Release contain?

Each caplet of Feosol® Natural Release with carbonyl iron contains 45 mg of elemental iron and delivers 250% of the recommended daily value for iron.

Don’t worry if you are confused by elemental iron – it’s complicated! Simply put, elemental iron is defined as the amount of iron available for absorption by your body. Not all irons are 100% absorbable. For example, ferrous gluconate is 12% elemental iron, while carbonyl is 100% elemental iron. That’s why carbonyl is often referred to as “pure iron.”

Are the Feosol® Natural Release iron caplets or tablets slow-released or time-released?

No, Feosol® Natural Release iron supplements are not time-released caplets.

feosol slow release

Supplements and vitamins that claim to have a slow-release mechanism usually rely on a chemical coating to slow down the absorption in your stomach and digestive track. For example, many probiotic supplements have an enteric coating to protect them from dissolving in your stomach acid.

On the other hand, Feosol® Natural Release with carbonyl iron requires no special coating or additives to achieve a gradual and gentle absorption of iron. That’s because the type of iron itself – carbonyl – is naturally regulated by your body, which must produce gastric acid to facilitate absorption.

Because of this prolonged, gradual absorption, many people find that it is a well-tolerated iron alternative with milder GI side effects when compared to other non-heme forms of iron.

What are the most common side effects of taking carbonyl iron?

Because of its gradual, gentle and prolonged absorption, carbonyl iron is milder on the system than iron salts such as ferrous sulfate or ferrous gluconate. However, taking any iron supplement may produce GI side effects such as: constipation, diarrhea or upset stomach/nausea. If any of these side effects persist or worsen, call your doctor.

Is the iron in Feosol® Natural Release a heme iron or non-heme iron?

iron in lentils

The iron in Feosol® Natural Release is non-heme iron. Dietary iron comes in two forms: heme and non-heme.

Heme iron comes from an animal, like the iron you would find in chicken or steak. On the other hand, non-heme iron can be an iron salt or plant-derived, like the iron in spinach, vegetables, lentils and beans.