Optimum Nutrition Serious Mass supplement bottle
Optimum Nutrition

Serious Mass

What We Researched
4 active ingredients analyzed · 16 inactive ingredients decoded · 9 brand certifications checked · Last updated: Mar 2026
62
Product Score Fair
92
Brand Score Excellent

Product Analysis

Transparency Very Poor

Supplement Facts

IngredientAmount% DV
Creatine Monohydrate
L-Glutamine
Inositol
L-Ascorbic Acid
Bioavailability Very Good

Absorption Rating

  • Creatine Monohydrate Good
  • L-Glutamine Good
  • Inositol Good
  • L-Ascorbic Acid Fair
Other Ingredients Excellent

Fillers & Additives

  • Maltodextrin
  • Whey protein concentrate (milk)
  • Calcium caseinate (milk)
  • Flavorings
  • Milk Mineral Complex
  • Medium chain triglycerides (milk)
  • Egg albumin
  • Dipotassium Phosphate
  • Sodium Chloride
  • Glutamine peptides (wheat gluten)
  • Magnesium Oxide
  • Whey powder (milk)
  • Sweetener (sucralose)
  • Antioxidant (tocopherol-rich extract)
  • Calcium D-pantothenate
  • Pteroylmonoglutamic acid
Efficacy N/A

Dosage Analysis

Dosage data not available for assessment.

Supplement Facts

Ingredient Amount % Daily Value
Creatine Monohydrate
L-Glutamine
Inositol
L-Ascorbic Acid

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Whey protein concentrate (milk) Unknown
Calcium caseinate (milk) Unknown
Flavorings Unknown
Milk Mineral Complex Unknown
Medium chain triglycerides (milk) Unknown
Egg albumin Unknown
Dipotassium Phosphate Generally_safe

It is used to maintain the pH of supplements.

Sodium Chloride Safe

Provides sodium, stabilizes formulations.

Glutamine peptides (wheat gluten) Unknown
Magnesium Oxide Generally_safe

It is used to provide magnesium, an essential mineral.

Whey powder (milk) Unknown
Sweetener (sucralose) Unknown
Antioxidant (tocopherol-rich extract) Unknown
Calcium D-pantothenate Unknown
Pteroylmonoglutamic acid Unknown
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
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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 62/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 4 active ingredients Of the 16 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 Serious Mass?

Optimum Nutrition Serious Mass contains 4 active ingredients: Creatine Monohydrate, L-Glutamine, Inositol, L-Ascorbic Acid. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Optimum Nutrition Serious Mass safe to take?

Optimum Nutrition Serious Mass 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.

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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.