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Best Form of Iron

Question:
What is the best form of iron supplement?
Iron Supplements Reviewed by ConsumerLab.com
Answer:
Iron comes in many forms. If taken with just water, all are about equally well-absorbed, so less expensive forms, such as ferrous sulfate, are fine. However, with larger doses, some people experience gastric discomfort and/or constipation. Taking with food may reduce discomfort, but also reduces absorption of certain forms of iron, such as ferrous sulfate, while other forms are better-absorbed in the presence of food, such ferrous bisglycinate (sold as "Gentle Iron") and ferrous glycinate.

Note that some supplements include vitamin C to increase iron absorption but this is unlikely have a significant effect, and there is concern that slow- or timed-release products may lead to reduced absorption of iron. For more details see the Forms of Iron and Avoiding Stomach Upset section of our Iron Supplements Review. Also see our overall Top Picks among the iron supplements we tested.

Learn more about iron supplements:



Why is iron not in many multivitamins? How can I find one that does contain iron? >>

What are the signs of iron deficiency anemia? >>

Which supplements can cause constipation? >>

See other recent and popular questions >>
COMMENTS

Vicki17506   January 30, 2019
What about iron carbonyl such as EZ Melts?

ConsumerLab.com   February 4, 2019
Hi Vicki - You can find information about carbonyl iron in the "Forms of Iron and Avoiding Stomach Upset" section of the Iron Supplements Review: https://www.consumerlab.com/reviews/iron-supplements-review/iron/#carbonyl

Elizabeth17505   January 30, 2019
I am surprised you did not mention carbonyl iron. It is the only type of iron that I have been able to take without significant gastric discomfort.

ConsumerLab.com   February 6, 2019
Thank you for sharing this, Elizabeth, it may helpful to other members. As noted in our response above, carbonyl iron is discussed in the "Forms of Iron and Avoiding Stomach Upset" section of the Iron Supplements Review: https://www.consumerlab.com/reviews/iron-supplements-review/iron/#carbonyl


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This CL Answer initially posted on 1/30/2019.
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