**Zinc-L-Carnosine** at 75mg per serving — right at the top of the clinically studied dose range for gut lining support. This is the patented PepZin GI form, a chelate that sticks to your stomach wall and delivers zinc and carnosine directly where they're needed. It's been used as a prescription gastroprotective in Japan since 1994, and the research supports its role in protecting your gut lining from stress- and NSAID-related damage.

You're also getting 16mg of elemental **zinc** per serving, which falls within the supplemental range and contributes to immune function and skin health. The zinc here isn't free-floating — it's bound to **L-carnosine** as part of the chelate, so it behaves differently than a standard zinc supplement and targets the GI tract specifically.

The 59mg of **L-carnosine** in this complex is far below standalone carnosine doses used for anti-aging or cognitive research (500–1,500mg), so don't expect those benefits here. This product is built for one job — stomach and gut lining support — and the dosing matches the clinical evidence for that purpose.

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Doctor's Best

PepZin GI

2 Capsules · 60 servings

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What it does

A combination of 3 label ingredients.

PepZin GI

zinc l-carnosinePremium

Some zinc-carnosine preparations may support stomach-ulcer healing; evidence does not establish relief for every digestive complaint.

Zinc

Form not confirmedGrade —

Label lists Zinc (16 mg). Benefit information is limited.

Immune
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Ingredients (3)

Other ingredients

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

HypromelloseCapsule

Plant-derived capsule material from cellulose

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Lab testing

How to take it

With food
Space it a couple of hours from Iron and Calcium

On the label

Suggested Adult Use: Take 2 capsules daily on an empty stomach, or as recommended by a nutritionally informed physician.

The label says to take it on an empty stomach. What's in this one sits better with food, and you give up little by taking it that way.

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

Not medical advice. Consult your healthcare professional.

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