**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.

BioStacks
Doctor's Best

PepZin GI

2 Capsules · 60 servings · $0.38/serving

iHerbAmazon

Best for

Immune

Ingredients (3)

PepZin GI

100%

Dose

75 mg

Target

37.5–75 mg

Form

Premium

Zinc

100%

Dose

16 mg

Target

15–30 mg

Form

Not listed

L-Carnosine

12%

Dose

59 mg

Target

500–1500 mg

Form

—

Other Ingredients (4)

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

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and 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. clinical 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.

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