ferrous sulfate

Mineral

Ferrous sulfate is iron in its plainest clothes — essential for red blood cells, routine in food, and dangerous mainly from the human medicine cabinet.

Also appears on labels as: iron sulfate · ferrous sulphate · ferrous sulfate monohydrate

What it is

The standard inorganic iron supplement — the same compound as human iron tablets. Iron builds hemoglobin; deficiency means anemia; complete foods carry a calculated dose.

Why it's in pet food

Meeting the iron requirement, particularly in recipes lighter on red meat and organ content, which carry iron naturally. Formulated levels are conservative and boring — as they should be.

How Bowlmark scores it

Scores are deterministic math over the printed label — the rules below apply to every product identically, and nothing estimates or fills in a blank.

Neutral. The real-world iron hazard isn't in pet food at all: HUMAN iron supplements are a classic dog-poisoning story — prenatal vitamins and iron pills are potent, tasty-coated, and seriously toxic in quantity. The pantry, not the kibble, is where iron deserves your vigilance; a raided pill bottle is a call-the-vet-now event.

For dogs

Iron pill ingestion causes GI injury first and organ damage later — quantity matters, so bring the bottle's strength and count to the phone call.

Read the full methodology

Foods that list ferrous sulfate

Ranked by score where scores exist. Placement here is never sold.

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Sources

Cite this page

Bowlmark. "Ferrous sulfate in pet food — what it is and how it scores." https://www.bowlmark.com/ingredient/ferrous-sulfate

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Verified: Last verified August 12, 2026

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