Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme, 3.97 lb (1.8 kg) supplement bottle
Optimum Nutrition

Gold Standard® 100% Casein, Chocolate Supreme, 3.97 lb (1.8 kg)

What We Researched
14 active ingredients analyzed · 10 inactive ingredients decoded · 9 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
78
Product Score Fair
92
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium 500 mg 40%
Iron 1.5 mg 8%
Potassium 230 mg 4%
Magnesium 85 mg 20%
Zinc 11 mg 100%
Bioavailability Very Good

Absorption Rating

  • Calcium Good
  • Iron Fair
  • Potassium Good
  • Magnesium Good
  • Zinc Fair
Other Ingredients Excellent

Fillers & Additives

  • Micellar Casein
  • Cocoa Powder (Processed with Alkali)
  • Natural and Artificial Flavor
  • Salt
  • Gum Blend (Guar Gum, Gum Acacia, Xanthan Gum)
  • Sunflower and/or Soy Lecithin
  • Magnesium Oxide
  • Acesulfame Potassium
  • Sucralose
  • Zinc sulfate monohydrate
Efficacy Fair

Dosage Analysis

  • Calcium 500 mg Effective
  • Iron 1.5 mg Under-dosed
  • Potassium 230 mg Under-dosed
  • Magnesium 85 mg Under-dosed
  • Zinc 11 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calories 120
Total Fat 1 g 1%
Cholesterol 15 mg 5%
Sodium 260 mg 11%
Total Carbohydrate 4 g 1%
Dietary Fiber 1 g 4%
Total Sugars 1 g
Includes 0 g Added Sugars 0%
Protein 24 g 48%
Calcium 500 mg 40%
Iron 1.5 mg 8%
Potassium 230 mg 4%
Magnesium 85 mg 20%
Zinc 11 mg 100%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Micellar Casein Generally_safe

It is used as a source of protein.

Cocoa Powder (Processed with Alkali) Generally_safe

It is used to add color and flavor to the supplement.

Natural and Artificial Flavor Generally_safe

It is used to improve the taste of the product.

Salt Safe

It is used as a flavoring agent.

Gum Blend (Guar Gum, Gum Acacia, Xanthan Gum) Generally_safe

It is used as a thickener and stabilizer.

Sunflower and/or Soy Lecithin Generally_safe

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

Magnesium Oxide Generally_safe

It is used to provide magnesium, an essential mineral.

Acesulfame Potassium Generally_safe

It is used to provide sweetness without adding calories.

Sucralose Generally_safe

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

Zinc sulfate monohydrate Unknown

Price Comparison

iHerb $120.99 $2.28 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$122$121$120$119$118 Mar 12 $120.00
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
Optimum Nutrition

Founded 1986 · Downers Grove, IL, United States · 95 products · optimumnutrition.com

Certifications

9 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Nsf Certified For Sport Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Nsf Gmp Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed Source
In House Testing — Verified Source

Violation History

5 incidents
Prop 65 Lead2025-07-21Source
Prop 65 Lead2024-11-22Source
Recall Various nutritional and beverage products2022-07-28Source
Prop 65 Lead2017-03-10Source
Lawsuit Deceptive claims about the plant-based enzyme 'Aminogen' and its effect on protein digestion and absorption.2013Source
Related Supplements
NOW Foods Eggshell Membrane, 500 mg, 60 Capsules
NOW Foods Eggshell Membrane, 500 mg, 60 Capsules
Product 100 Brand 100
NOW Foods Sports, D-Ribose Powder, 1 lb (454 g)
NOW Foods Sports, D-Ribose Powder, 1 lb (454 g)
Product 100 Brand 100
NOW Foods Sports, D-Ribose Powder, 8 oz (227 g)
NOW Foods Sports, D-Ribose Powder, 8 oz (227 g)
Product 100 Brand 100
Optimum Nutrition Glutamine Powder, Unflavored, 10.58 oz (300 g)
Optimum Nutrition Glutamine Powder, Unflavored, 10.58 oz (300 g)
Product 100 Brand 92
Optimum Nutrition Glutamine Powder, Unflavored, 2.2 lbs (1 kg)
Optimum Nutrition Glutamine Powder, Unflavored, 2.2 lbs (1 kg)
Product 100 Brand 92
Optimum Nutrition Micronized Creatine Powder, Unflavored, 10.58 oz (300 g)
Optimum Nutrition Micronized Creatine Powder, Unflavored, 10.58 oz (300 g)
Product 100 Brand 92
Frequently Asked Questions
Is Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme a good supplement?

Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme, 3.97 lb (1.8 kg) received a product quality score of 78/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 14 active ingredients with 53 servings per container. Of the 10 inactive ingredients, 1 are rated safe and 0 are flagged for review. The manufacturer, Optimum Nutrition, holds a brand trust score of 92/100 with 9 verified certifications including Consumerlab, Informed Sport, Labdoor, Nsf Certified For Sport.

What are the ingredients in Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme?

Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme contains 14 active ingredients: Calories (120), Total Fat (1 g), Cholesterol (15 mg), Sodium (260 mg), Total Carbohydrate (4 g), Dietary Fiber (1 g), and 8 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme safe to take?

Optimum Nutrition Gold Standard® 100% Casein, Chocolate Supreme, 3.97 lb (1.8 kg) 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 Optimum Nutrition a trustworthy supplement brand?

Optimum Nutrition receives a brand trust score of 92/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1986 and headquartered in Downers Grove, IL, United States, the company offers 95 products in their lineup. They hold 9 verified certifications including Consumerlab, Informed Sport, Labdoor, Nsf Certified For Sport. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Optimum Nutrition has 5 historical regulatory incidents on record, which are factored into the trust score.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Download on App Store Browse All Supplements
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.