Zinc Carnosine (PepZin GI)
Zinc carnosine (also sold as PepZin GI or polaprezinc) is a chelated compound of zinc and L-carnosine that adheres to the stomach lining and supports mucosal repair. It has good evidence for protecting gut integrity, reducing stomach inflammation, and supporting recovery from gastric damage.
Quick Verdict
A well-targeted gut supplement with good evidence for protecting and repairing the stomach and intestinal lining.
If you have gastritis, take NSAIDs regularly, or experience exercise-related gut issues, zinc carnosine is a well-supported option used medically in Japan. More targeted than general zinc supplements for GI complaints.
At a Glance
Dose
75-150mg per day (providing 16-34mg zinc + 59-116mg carnosine)
When to Take
On an empty stomach or between meals for direct gastric contact
Best Form
Zinc carnosine capsules
Evidence
56% avg
What It Is
Zinc carnosine is a chelated compound where zinc is bound to the dipeptide L-carnosine in a 1:1 molecular ratio. Unlike regular zinc supplements that are rapidly absorbed, this chelation causes the compound to dissociate slowly in the stomach, allowing prolonged contact with the gastric mucosa. It was developed in Japan (as polaprezinc) and is prescribed there for gastric ulcers. In Western markets, it is sold as the supplement PepZin GI. The unique slow-release property distinguishes it from other zinc forms — it provides both the mucosal-protective effects of zinc and the antioxidant properties of carnosine directly at the site where they are most needed. It has gained popularity among those with gastritis, H. pylori infection recovery, and exercise-induced gut damage.
How It Works
Zinc carnosine protects the gastrointestinal lining through multiple mechanisms. The compound adheres to ulcerated or damaged mucosal tissue, creating a protective coating. It stimulates mucus secretion and prostaglandin E2 production, enhancing the stomach's natural defense barrier. Zinc carnosine also stabilizes the mucosal membrane, reduces inflammatory cytokine expression (IL-8, TNF-alpha), and inhibits NF-kB activation in gastric epithelial cells. At the cellular level, it promotes cell migration and proliferation for wound healing. It also reduces oxidative stress in gastric tissue and may inhibit H. pylori adhesion. For exercise-induced gut permeability, zinc carnosine helps maintain tight junction integrity in intestinal epithelial cells exposed to heat stress and reduced blood flow.
Evidence by Goal
stomach lining
Moderate-to-good evidence for stabilizing and repairing the stomach lining, reducing gastric inflammation, and protecting against NSAID-induced damage.
gut health
Good evidence for protecting gastric mucosa, reducing gut permeability, and supporting ulcer healing. Used medically in Japan for decades.
Dosage & Usage
Standard Dose
75-150mg per day (providing 16-34mg zinc + 59-116mg carnosine)
Loading Protocol
No loading phase; protective effects begin within days of supplementation
Timing
On an empty stomach or between meals for direct gastric contact; twice daily dosing
Best Form
Zinc carnosine capsules (PepZin GI or polaprezinc)
📅 What to Expect
Week 1-2
Zinc-carnosine complex adhering to stomach lining. Protective coating forming.
Week 4-8
Stomach ulcer healing accelerating. Gut permeability decreasing.
Week 8-12
Intestinal barrier fully restored in most studies. H. pylori damage repaired.
Month 3+
Typical course is 8-12 weeks. Can discontinue once gut lining healed.
🎯 How to Know It's Working
Stomach discomfort reduced
Gut lining feels protected
Less heartburn or gastric irritation
If not working: If no gut improvement after 8 weeks at 75-150mg/day, investigate other causes of stomach issues (H. pylori, food sensitivities, etc.).
🏷️ Buying Guide
✓ Look For
- • Zinc carnosine (PepZin GI branded preferred)
- • 75mg zinc carnosine per serving
- • Designed for GI mucosal support
✗ Avoid
- • Substituting regular zinc for zinc carnosine
- • Taking long-term without monitoring copper levels
🥗 Get It From Food
🛡️ Safety Profile
Common Side Effects
- • mild nausea
- • metallic taste (rare)
- • constipation (rare)
⚠️ Contraindications
- 🚫 copper deficiency (zinc can deplete copper with long-term use)
- 🚫 zinc allergy
💊 Drug Interactions
- • tetracycline antibiotics (zinc reduces absorption — separate by 2 hours)
- • quinolone antibiotics
- • penicillamine
Long-Term Safety
Polaprezinc has been used medically in Japan for over 25 years with excellent safety. Standard doses provide moderate zinc amounts. With prolonged use (>6 months), monitor copper levels as zinc can inhibit copper absorption.
👥 Who Benefits Most
Best For
- ✓ individuals with gastritis or stomach discomfort
- ✓ those taking NSAIDs regularly
- ✓ athletes with exercise-induced GI issues
- ✓ people recovering from H. pylori treatment
Less Effective For
- — those without stomach or gut issues
- — individuals seeking general zinc supplementation (better options exist for that purpose)
📚 Key Research
3 peer-reviewed studies supporting this supplement's effects.
Zinc carnosine as protective agent for gut permeability: a human and in vitro study
Mahmood A, FitzGerald AJ, Marchbank T, et al. · Gut (2007)
Zinc carnosine stabilized gut integrity and reduced NSAID-induced increases in intestinal permeability by 3-fold in human volunteers.
Mechanism of the anti-ulcer effect of polaprezinc
Matsukura T, Tanaka H · European Journal of Pharmacology (2000)
Polaprezinc demonstrated gastric cytoprotective effects through stimulation of mucus glycoprotein synthesis and inhibition of oxidative damage to gastric cells.
Zinc carnosine works with bovine colostrum in truncating heavy exercise-induced increase in gut permeability
Davison G, Marchbank T, March DS, et al. · European Journal of Applied Physiology (2016)
Zinc carnosine significantly reduced exercise-induced gut permeability, maintaining intestinal barrier integrity during strenuous exercise.
💰 Cost & Forms
Estimated Monthly Cost
$15-30
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