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Optimum Nutrition Serious Mass supplement bottle
Optimum Nutrition

Serious Mass Review

What We Researched
· 5 inactive ingredients decoded · 10 brand certifications checked · Page generated: Sep 2026
58
Product Score Poor
100
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Fair

Supplement Facts

No supplement facts data available.

Bioavailability N/A

Absorption Rating

No ingredient forms matched our reference database.

Other Ingredients Excellent

Fillers & Additives

  • Cocoa (Processed with Alkali)
  • Natural and Artificial Flavor
  • Sunflower and/or Soy Lecithin
  • Acesulfame Potassium
  • Sucralose
Efficacy N/A

Dosage Analysis

Dosage data not available for assessment.

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cocoa (Processed with Alkali) Generally_safe

It is added to supplements to provide flavor and color.

Natural and Artificial Flavor Generally_safe

It is used to improve the taste of the product.

Sunflower and/or Soy Lecithin Generally_safe

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

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.

Brand Trust Report
Optimum Nutrition

Founded 1986 · Downers Grove, IL, United States · 311 products · optimumnutrition.com

Certifications

10 certifications
Consumerlab Source available Primary evidence
Informed Sport Source available Primary evidence
Labdoor Source available Primary evidence
Nsf Certified For Sport Source available Primary evidence
Usda Organic Source available Primary evidence
Vegan Certified Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Non Gmo Project Source available Primary evidence
Nsf Gmp Source available Primary evidence
Informed Choice Supporting evidence unavailable

Transparency

5 claims
Third Party Testing Claim — Verified Evidence available Evidence
Testing Lab Disclosure — Claimed Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Contains Proprietary Blend — True Brand claim; evidence unavailable

Violation History

5 incidents
Prop 65 Lead2025-07-21 Source available Primary source
Prop 65 Lead2024-11-22 Source available Primary source
Recall Various nutritional and beverage products2022-07-28 Source available Primary source
Prop 65 Lead2017-03-10 Source available Primary source
Lawsuit Deceptive claims about the plant-based enzyme 'Aminogen' and its effect on protein digestion and absorption.2013 Source available Primary source
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Frequently Asked Questions
Is Optimum Nutrition Serious Mass a good supplement?

Optimum Nutrition Serious Mass received a product quality score of 58/100 in GoodSupp's independent analysis, indicating several areas of concern that consumers should review. All 5 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Optimum Nutrition, holds a brand trust score of 100/100.

Is Optimum Nutrition Serious Mass safe to take?

GoodSupp reviewed the inactive-ingredient data available for Optimum Nutrition Serious Mass. All 5 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. 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 100/100 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 311 products in their lineup. Note: Optimum Nutrition has 5 historical regulatory incidents on record, which are factored into the trust score.

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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 — read our methodology. 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.