Quest Nutrition Protein Powder, Peanut Butter, 1.6 lb (726 g) supplement bottle
Quest Nutrition

Protein Powder, Peanut Butter, 1.6 lb (726 g)

What We Researched
15 active ingredients analyzed · 11 inactive ingredients decoded · 1 brand certification checked · 1 retailer compared · Last updated: Mar 2026
56
Product Score Poor

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vit. D 0 mcg 0%
Calcium 340 mg 25%
Iron 0.2 mg 2%
Potassium 380 mg 8%
Bioavailability Very Good

Absorption Rating

  • Calcium Good
  • Iron Fair
  • Potassium Good
Other Ingredients Good

Fillers & Additives

  • Protein blend (whey protein isolate, micellar casein, milk protein isolate)
  • Peanuts High
  • Natural flavors (contains peanuts)
  • Silicon Dioxide
  • Lecithin (Sunflower, Canola, and/or Soy Lecithin)
  • Salt
  • Cellulose Gum
  • Xanthan Gum
  • Sucralose
  • Stevia Sweetener
  • Tapioca syrup††
Efficacy Very Poor

Dosage Analysis

  • Calcium 340 mg Under-dosed
  • Iron 0.2 mg Under-dosed
  • Potassium 380 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 120
Total Fat 1.5 g 2%
Saturated Fat 0 g 0%
Trans Fat 0 g
Cholesterol 15 mg 5%
Sodium 200 mg 9%
Total Carbohydrate 2 g 0%
Dietary Fiber 0 g 0%
Total Sugars 1 g
Includes 0 g Added Sugars 0%
Protein 23 g 46%
Vit. D 0 mcg 0%
Calcium 340 mg 25%
Iron 0.2 mg 2%
Potassium 380 mg 8%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Protein blend (whey protein isolate, micellar casein, milk protein isolate) Unknown
Peanuts Avoid
Natural flavors (contains peanuts) Unknown
Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Lecithin (Sunflower, Canola, and/or Soy Lecithin) Generally_safe

It is used as an emulsifier to help mix oil and water-based ingredients.

Salt Safe

It is used as a flavoring agent.

Cellulose Gum Safe

Thickens and stabilizes supplement formulations.

Xanthan Gum Safe

Thickens and stabilizes liquid and semi-solid supplements.

Sucralose Generally_safe

Adds sweetness to chewables, gummies, and powdered supplements without calories.

Stevia Sweetener Generally_safe

It is used as a natural, low-calorie sweetener.

Tapioca syrup†† Unknown

Price Comparison

iHerb $44.46 $1.93 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$46$45$44$43$42 Mar 12 $44.00
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
Quest Nutrition

Founded 2010 · El Segundo, California, United States · 81 products · questnutrition.com

Certifications

1 certification
Consumerlab Verified Source

Transparency

1 claim

Violation History

3 incidents
Prop 65 Lead2022-06-27Source
Lawsuit Misleading labeling of the 'White Chocolate Raspberry Protein Bar' to suggest it contains white chocolate.2020Source
Fda Warning Details of the original warning letter were not immediately available in the search results, but the closeout letter indicates the violations were addressed.2015-07-29Source
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Frequently Asked Questions
Is Quest Nutrition Protein Powder, Peanut Butter a good supplement?

Quest Nutrition Protein Powder, Peanut Butter, 1.6 lb (726 g) received a product quality score of 56/100 in GoodSupp's independent analysis, indicating several areas of concern that consumers should review. The product contains 15 active ingredients with 23 servings per container. Of the 11 inactive ingredients, 4 are rated safe and 0 are flagged for review.

What are the ingredients in Quest Nutrition Protein Powder, Peanut Butter?

Quest Nutrition Protein Powder, Peanut Butter contains 15 active ingredients: Calories (120), Total Fat (1.5 g), Saturated Fat (0 g), Trans Fat (0 g), Cholesterol (15 mg), Sodium (200 mg), and 9 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Quest Nutrition Protein Powder, Peanut Butter safe to take?

Quest Nutrition Protein Powder, Peanut Butter, 1.6 lb (726 g) 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.

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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.