Home Ingredients Heme Iron Polypeptide (HIP)
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Heme Iron Polypeptide (HIP)

Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

Heme iron polypeptide (HIP, brand: Proferrin) is iron derived from animal hemoglobin — bound within a protein matrix exactly as iron exists in red meat. Distinguished by FUNDAMENTALLY DIFFERENT ABSORPTION PATHWAY from non-heme (ferrous salt) iron — uses heme transporter HCP1, not DMT1. Up to 21% absorbed (vs ~0.1% for ferrous gluconate when taken with meals). Much fewer GI side effects but expensive and animal-derived (not vegetarian/vegan).

Studied Dose 10-22 mg elemental heme iron/day; Proferrin Forte = 11 mg elemental iron per tablet
Active Compound Heme iron polypeptide (porcine or bovine hemoglobin-derived)

Benefits

Distinct Absorption Pathway (HCP1)

Heme iron uses the HCP1 (heme carrier protein 1) transporter — DIFFERENT from non-heme iron's DMT1 pathway. Means heme iron absorption is NOT affected by phytates, polyphenols, calcium, or PPI use. Reliable absorption with meals.

Supported by Trial 1

Up to 21% Absorption Rate

Heme iron polypeptide absorbed at ~21% efficiency vs ~0.1-2% for ferrous gluconate when taken WITH MEALS. Even compared to fasting ferrous sulfate (~10-15%), heme iron is substantially better-absorbed when timing is convenient (with meals).

Supported by Trial 1

Minimal GI Side Effects

Heme iron polypeptide causes substantially fewer GI symptoms than ferrous salts — less constipation, less nausea, less metallic taste. Bound iron means no free Fe²⁺ irritating mucosa.

Supported by Trial 1, Trial 2

No Drug Interaction with Calcium/PPIs

Unlike ferrous salts, heme iron absorption is NOT meaningfully reduced by calcium, PPIs, antacids, coffee, or tea. Patients on chronic acid suppression (very common) maintain iron absorption.

Supported by Trial 1, Trial 2

IBD/Crohn's/Bariatric Surgery Patients

Heme iron may be preferred form for IBD patients (gentler), bariatric surgery patients (altered iron absorption pathways), and chronic PPI users — populations where ferrous salt absorption is problematic.

Supported by Trial 1

Mechanism of action

1

HCP1 (Heme Carrier Protein 1) Transport

Heme iron is absorbed intact via HCP1 transporter on duodenal enterocyte apical membrane. Inside the cell, heme oxygenase releases iron from the porphyrin ring; the iron is then exported via ferroportin like other iron sources.

2

Bypass of Iron Absorption Inhibitors

Phytates, polyphenols, calcium, oxalates inhibit DMT1 absorption of non-heme iron. Heme is absorbed intact through HCP1, bypassing all these inhibitors.

3

Animal Source Polypeptide Matrix

HIP is derived from animal (typically porcine or bovine) hemoglobin — partially digested to produce a heme-peptide complex. Mimics dietary heme iron from red meat (the most bioavailable dietary iron form).

4

Reduced Mucosal Irritation

No free Fe²⁺ in GI lumen means no oxidative damage to mucosal cells — basis for substantially better tolerability.

Clinical trials

1
Heme Iron Polypeptide vs Ferrous Fumarate — Seligman 2003
PubMed

RCT comparing heme iron polypeptide vs ferrous fumarate for absorption when taken with meals.

Adults with iron deficiency.

When taken with meals, HIP iron absorption was significantly higher than ferrous fumarate. Side effects substantially fewer with HIP. Established HIP's value for meal-time iron supplementation.

2
Proferrin Use in Pregnancy — Open-Label
PubMed

Open-label studies of HIP in pregnant women with IDA who could not tolerate ferrous salts.

Pregnant women with IDA + sulfate intolerance.

HIP raised hemoglobin in pregnancy IDA with minimal side effects. Open-label limitation; not direct comparison to bisglycinate or sulfate at equivalent elemental doses.

Side effects and drug interactions

Common Potential side effects

Generally very well-tolerated.
Mild GI distress at high doses (uncommon).
Dark/normal stools (less staining than ferrous salts).
Cost — significantly more expensive than ferrous salts.
ANIMAL-DERIVED — not appropriate for vegetarians/vegans.

Important Drug interactions

Very few drug interactions vs ferrous salts.
Calcium — does NOT meaningfully reduce heme iron absorption (advantage).
PPIs/H2 blockers/antacids — do NOT meaningfully reduce heme iron absorption (advantage).
Coffee/tea tannins — do NOT meaningfully reduce heme iron absorption.
Tetracyclines/quinolones — not chelated by heme; minimal interaction (advantage).
Levothyroxine — minimal interaction (advantage).
Vitamin C — enhances ferrous salt absorption but minimal effect on heme iron (already well-absorbed).
MAIN PRACTICAL ADVANTAGE: heme iron can be taken with calcium, dairy, PPIs, coffee, with meals — without absorption loss.
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Frequently asked questions about Heme Iron Polypeptide (HIP)

What is Heme Iron Polypeptide (HIP)?

Heme iron polypeptide (HIP, brand: Proferrin) is iron derived from animal hemoglobin — bound within a protein matrix exactly as iron exists in red meat.

What does Heme Iron Polypeptide (HIP) do?

Heme iron is absorbed intact via HCP1 transporter on duodenal enterocyte apical membrane. Inside the cell, heme oxygenase releases iron from the porphyrin ring; the iron is then exported via ferroportin like other iron sources. In clinical research, Heme Iron Polypeptide (HIP) has been studied for distinct absorption pathway (hcp1), up to 21% absorption rate, minimal gi side effects.

Who should take Heme Iron Polypeptide (HIP)?

Heme Iron Polypeptide (HIP) may be most relevant for people interested in bone health, immune support. It has been clinically studied for distinct absorption pathway (hcp1), up to 21% absorption rate, minimal gi side effects. As with any supplement, consult your healthcare provider before starting, especially if you have medical conditions or take prescription medications.

How long does Heme Iron Polypeptide (HIP) take to work?

Most clinical trial effects appear over weeks of consistent use; individual response varies. Acute or same-day effects (where applicable) typically appear within hours, but most cumulative benefits — particularly those affecting biomarkers, mood, sleep quality, or chronic symptoms — require 4-12 weeks of regular use to fully assess. If you don't notice benefit after 12 weeks at the appropriate dose, it may not be your responder.

When is the best time to take Heme Iron Polypeptide (HIP)?

Heme Iron Polypeptide (HIP) can typically be taken with breakfast or dinner — taking with food reduces GI sensitivity for most supplements. Specific timing matters less than daily consistency for cumulative effects. Always check product labeling and follow personalized guidance from your healthcare provider.

Is Heme Iron Polypeptide (HIP) worth taking?

Heme Iron Polypeptide (HIP) has moderate clinical evidence (Evidence Level 3/5 on NutraSmarts) — meaningful trial support exists, though results are less consistent than top-tier ingredients. Whether it's worth taking depends on your specific goals, what you've already tried, your budget, and your overall supplement strategy. The honest framing: no supplement is essential for most people, and lifestyle factors (sleep, exercise, diet, stress management) typically produce larger effects than any single supplement. Heme Iron Polypeptide (HIP) is most worth trying if its evidence-supported uses align with your specific goals.

What is the recommended dosage of Heme Iron Polypeptide (HIP)?

The clinically studied dose for Heme Iron Polypeptide (HIP) is 10-22 mg elemental heme iron/day; Proferrin Forte = 11 mg elemental iron per tablet. Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is Heme Iron Polypeptide (HIP) used for?

Heme Iron Polypeptide (HIP) is studied for distinct absorption pathway (hcp1), up to 21% absorption rate, minimal gi side effects. Heme iron uses the HCP1 (heme carrier protein 1) transporter — DIFFERENT from non-heme iron's DMT1 pathway. Means heme iron absorption is NOT affected by phytates, polyphenols, calcium, or PPI use. Reliable absorption with meals.