ferrous sulfate
noun
: a salt obtained usually in its bluish-green hydrated form FeSO4·7H2O that is used especially in making inks, pigments, and other iron salts and in medicine for treating anemia caused by iron deficiency
Examples of ferrous sulfate in a Sentence
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For example, ferrous sulfate contains roughly 20% elemental iron compared to ferrous fumarate, which is 33% elemental iron.
—
Amy Brownstein, Ms, Rdn, Verywell Health, 25 Feb. 2025
In addition to ferrous sulfate and ferrous gluconate, other ferrous iron forms in a supplement include ferrous fumarate and ferrous bisglycinate.6
2.
—Melissa Nieves, Verywell Health, 9 Jan. 2025
Many iron supplements use a different form of iron called ferrous sulfate, which can cause unpleasant gastrointestinal symptoms like digestive upset, nausea, diarrhea, and constipation.
—Isabel Vasquez Rd Ldn, Verywell Health, 13 Sep. 2024
Nature Made Iron tablets contain 65 milligrams, 361% Daily Value, of ferrous sulfate iron.
—Tamar Kane, Ms, Rd, Verywell Health, 16 July 2024
Other forms of iron, like ferrous sulfate and ferrous fumarate, are not as gentle and may cause stomach issues for some.
—Tamar Kane, Ms, Rd, Verywell Health, 16 July 2024
However, the most common type of iron supplement—ferrous sulfate—is known to cause digestive problems, including constipation, diarrhea, and nausea, leading many people to avoid iron supplements.
—Sarah Anzlovar, Ms, Rd, Verywell Health, 4 June 2024
But Take Note Take note this supplement contains iron in the form of ferrous sulfate, which may cause gastrointestinal discomfort for some people.
—Casey Seiden, Parents, 26 Feb. 2024
Factors to Consider When Selecting an Iron Supplement When choosing an iron supplement for pregnancy, several factors should be taken into consideration:
Type of Iron: Look for supplements that contain elemental iron in forms such as ferrous fumarate or ferrous sulfate.
—Amber Smith, Discover Magazine, 10 Aug. 2023
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Amy Brownstein, Ms, Rdn, Verywell Health, 25 Feb. 2025
In addition to ferrous sulfate and ferrous gluconate, other ferrous iron forms in a supplement include ferrous fumarate and ferrous bisglycinate.6
2.
—Melissa Nieves, Verywell Health, 9 Jan. 2025
Many iron supplements use a different form of iron called ferrous sulfate, which can cause unpleasant gastrointestinal symptoms like digestive upset, nausea, diarrhea, and constipation.
—Isabel Vasquez Rd Ldn, Verywell Health, 13 Sep. 2024
Nature Made Iron tablets contain 65 milligrams, 361% Daily Value, of ferrous sulfate iron.
—Tamar Kane, Ms, Rd, Verywell Health, 16 July 2024
Other forms of iron, like ferrous sulfate and ferrous fumarate, are not as gentle and may cause stomach issues for some.
—Tamar Kane, Ms, Rd, Verywell Health, 16 July 2024
However, the most common type of iron supplement—ferrous sulfate—is known to cause digestive problems, including constipation, diarrhea, and nausea, leading many people to avoid iron supplements.
—Sarah Anzlovar, Ms, Rd, Verywell Health, 4 June 2024
But Take Note Take note this supplement contains iron in the form of ferrous sulfate, which may cause gastrointestinal discomfort for some people.
—Casey Seiden, Parents, 26 Feb. 2024
Factors to Consider When Selecting an Iron Supplement When choosing an iron supplement for pregnancy, several factors should be taken into consideration:
Type of Iron: Look for supplements that contain elemental iron in forms such as ferrous fumarate or ferrous sulfate.
—Amber Smith, Discover Magazine, 10 Aug. 2023
Cite this Entry
“Ferrous sulfate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ferrous%20sulfate. Accessed 8 Jul. 2025.
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