Supplement analysis backed by scientific evidence · PT

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Limited evidenceVitamins & minerals

Heme Iron Polypeptide

Iron in the heme form from animal blood, sold as better absorbed and gentler. Randomized trials find it no better than ferrous salts on haemoglobin or ferritin, at many times the price.

Evidence last reviewed: August 2026

What the science says

  • No better on the outcomes that matter Moderate evidence

    A 2025 randomized trial in 208 anemic infants found no difference from ferrous sulfate in the primary endpoints of haemoglobin and ferritin after 84 days, although several secondary markers (serum iron, transferrin saturation) favoured heme iron.

  • Small kidney-disease trial Limited evidence

    In 40 patients with non-dialysis chronic kidney disease, oral heme iron polypeptide maintained haemoglobin similarly to intravenous iron sucrose over 6 months, but ferritin rose far less (85 vs 244 µg/L). The trial was small and unblinded.

  • The tolerability claim is not demonstrated Limited evidence

    In both trials adverse events did not differ significantly between heme iron and its comparator, so the "gentler on the stomach" selling point rests largely on the much smaller amount of elemental iron each capsule delivers.

Dosage & safety

Studied doseProducts typically supply 11 mg heme iron polypeptide (roughly 1–2 mg elemental heme iron) taken one to three times daily — a fraction of the elemental iron in a standard ferrous salt.
SafetyGenerally well tolerated. Derived from bovine blood, so unsuitable for vegetarians and vegans and for some religious diets. Iron should not be supplemented without a confirmed deficiency; avoid in haemochromatosis. If anemia is significant, the low elemental dose may simply be inadequate.

Scientific references

Where to buy

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