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Rule 1 Proteins Casein Protein Powder supplement bottle
Rule 1 Proteins

Casein Protein Powder Review

What We Researched
2 active ingredients analyzed · 7 inactive ingredients decoded · 3 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
92
Brand Score Excellent

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

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium 580 mg 45%
Bioavailability Excellent

Absorption Rating

  • Calcium Good
Other Ingredients Excellent

Fillers & Additives

  • Natural and Artificial Flavors
  • Sunflower Lecithin
  • Cellulose Gum
  • Xanthan Gum
  • Sucralose
  • Salt
  • Acesulfame Potassium
Efficacy Excellent

Dosage Analysis

  • Calcium 580 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Protein 25 g 50%
Calcium 580 mg 45%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Natural and Artificial Flavors Generally_safe

It is used to improve the taste of the product.

Sunflower Lecithin Safe

Helps mix oil and water-based ingredients. Allergen-free alternative to soy lecithin.

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.

Salt Safe

It is used as a flavoring agent.

Acesulfame Potassium Generally_safe

It is used to provide sweetness without adding calories.

Brand Trust Report
Rule 1 Proteins

Founded 2014 · Aurora, IL, United States · ruleoneproteins.com/

Certifications

3 certifications
Informed Sport Source available Primary evidence
Nsf Gmp Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence

Transparency

4 claims
Third Party Testing Claim — Verified Evidence available Evidence
Testing Lab Disclosure — Verified Evidence available Evidence
In House Testing — Verified Evidence available Evidence

Violation History

2 incidents
Fda Warning Sale of an unregistered food product (RULE 1 Whey Blend 100% Whey Protein Naturally Rich in BCAAs Protein Powder Drink Mix Toasted Cinnamon Cereal).2025-06-12 Source available Primary source
Prop 65 Lead, Cadmium2019-01-07 Source available Primary source
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Frequently Asked Questions
Is Rule 1 Proteins Casein Protein Powder a good supplement?

Rule 1 Proteins Casein Protein Powder received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 57 servings per container. All 7 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Rule 1 Proteins, holds a brand trust score of 92/100.

What are the ingredients in Rule 1 Proteins Casein Protein Powder?

Rule 1 Proteins Casein Protein Powder contains 2 active ingredients: Protein (25 g), Calcium (580 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Rule 1 Proteins Casein Protein Powder safe to take?

GoodSupp reviewed the inactive-ingredient data available for Rule 1 Proteins Casein Protein Powder. All 7 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 Rule 1 Proteins a trustworthy supplement brand?

Rule 1 Proteins receives a brand trust score of 92/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2014 and headquartered in Aurora, IL, United States, Note: Rule 1 Proteins has 2 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.