Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex, 120 Veggie Caps supplement bottle
Doctor's Best

PepZin GI®, Zinc-L-Carnosine Complex, 120 Veggie Caps

What We Researched
3 active ingredients analyzed · 4 inactive ingredients decoded · 1 brand certification checked · 3 retailers compared · Last updated: Mar 2026
70
Product Score Fair
61
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Zinc(from PepZin GI® Zinc-L-Carnosine) 16 mg 145%
Zinc-L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 75 mg
L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 59 mg
Bioavailability Fair

Absorption Rating

  • Zinc(from PepZin GI® Zinc-L-Carnosine) Fair
  • Zinc-L-Carnosine(from PepZin GI® Zinc-L-Carnosine) Fair
  • L-Carnosine(from PepZin GI® Zinc-L-Carnosine) Fair
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Hypromellose (Vegetarian Capsule)
  • Magnesium Stearate (Vegetable Source)
  • Silicon Dioxide
Efficacy Poor

Dosage Analysis

  • Zinc(from PepZin GI® Zinc-L-Carnosine) 16 mg Effective
  • Zinc-L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 75 mg Under-dosed
  • L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 59 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Zinc(from PepZin GI® Zinc-L-Carnosine) 16 mg 145%
Zinc-L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 75 mg
L-Carnosine(from PepZin GI® Zinc-L-Carnosine) 59 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hypromellose (Vegetarian Capsule) Safe

It is used as a material for making vegetarian capsules.

Magnesium Stearate (Vegetable Source) Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$25$24$23$22$21 Mar 12 $22.99
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Doctor's Best

Founded 1990 · Tustin, California, USA · 186 products · doctorsbest.com

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source

Violation History

1 incident
Recall Red Yeast Rice2014-06-26Source
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Frequently Asked Questions
Is Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex a good supplement?

Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex, 120 Veggie Caps received a product quality score of 70/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 3 active ingredients with 60 servings per container. Of the 4 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Doctor's Best, holds a brand trust score of 61/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex?

Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex contains 3 active ingredients: Zinc(from PepZin GI® Zinc-L-Carnosine) (16 mg), Zinc-L-Carnosine(from PepZin GI® Zinc-L-Carnosine) (75 mg), L-Carnosine(from PepZin GI® Zinc-L-Carnosine) (59 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex safe to take?

Doctor's Best PepZin GI®, Zinc-L-Carnosine Complex, 120 Veggie Caps has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Doctor's Best a trustworthy supplement brand?

Doctor's Best receives a brand trust score of 61/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1990 and headquartered in Tustin, California, USA, the company offers 186 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Doctor's Best has 1 historical regulatory incident on record, which are factored into the trust score.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.