Understanding CAS# vs INCI Names – The Science Behind Ingredient Identity

When formulating personal care, skincare, household, or cosmetic products, ingredients are often listed using two identifiers: a CAS (Chemical Abstracts Service) number and an INCI (International Nomenclature of Cosmetic Ingredients) name. Although both refer to the same ingredient, they serve different roles. Together, they help businesses maintain transparency, traceability, and regulatory compliance.

At EZ Elements Canada, we prioritize clarity and documentation. Whether you’re purchasing Citric Acid, Carrier Oils, Shea Butter, Beeswax, Essential Oils, Surfactants, or Cosmetic Actives, each ingredient includes accurate CAS and INCI information for streamlined labeling and sourcing.

Why the INCI System Matters

INCI names are the standardized format required for labeling cosmetic and personal care products. This system ensures consistency across global markets, including Canada, the United States, and the European Union.

Examples:

IngredientCAS #INCI Name
Citric Acid77-92-9Citric Acid
Glycerin56-81-5Glycerin
Shea Butter91080-23-8Butyrospermum Parkii Butter

Using the correct INCI name ensures:

  • Clear ingredient labeling
  • Smooth regulatory reviews
  • Better ingredient recognition throughout the industry

At EZ Elements, products like Cold-Pressed Sweet Almond Oil, Coconut Oil, Niacinamide, and Beeswax are labeled with proper INCI terminology to help formulators stay compliant.

The Purpose of CAS Numbers

CAS numbers act as the permanent scientific identifier for a material — regardless of brand, grade, or supplier. They support:

  • SDS (Safety Data Sheet) creation
  • Import/export documentation
  • Purity validation
  • Quality assurance and safety audits

This level of identification is especially valuable when sourcing materials such as Cocamidopropyl Betaine, Niacinamide, Vegetable Glycerin, and surfactants where name variations can exist.

Why It Matters for Formulators

Understanding both systems helps ensure:

  • Compliance-ready labeling
  • Accurate ingredient sourcing
  • Reduced formulation errors
  • Confidence during scale-up or manufacturing

Explore Verified Ingredients

All EZ Elements products include a CAS number, INCI name, SDS, and COA. Popular items include: Citric Acid, Glycerin, Carrier Oils, Shea Butter, Beeswax, Essential Oils, Surfactants, and Niacinamide.

Ready to formulate? Shop now at EZ Elements Canada.

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