Cosmetic Ingredient Safety: How Regulators Determine What's Banned

When a cosmetic ingredient gets banned in the EU or restricted in the US, it's not arbitrary — it's the result of rigorous scientific evaluation by expert committees. Understanding how this process works helps brands make better formulation decisions and stay ahead of regulatory changes.

The Key Regulatory Bodies

SCCS — Scientific Committee on Consumer Safety (EU)

The SCCS is the EU's independent scientific committee that evaluates the safety of cosmetic ingredients. When the European Commission considers restricting an ingredient, it asks the SCCS for a scientific opinion. SCCS opinions are publicly available and form the basis for changes to the EU Cosmetics Regulation annexes.

The SCCS evaluates ingredients based on:

Toxicological data (acute toxicity, irritation, sensitization, genotoxicity, reproductive toxicity, carcinogenicity)
Exposure assessment (how much of the ingredient consumers are exposed to through normal use)
Margin of Safety (MoS) calculation — typically requires MoS ≥ 100

SCCS opinions are available at the European Commission SCCS Opinions page.

CIR — Cosmetic Ingredient Review (US)

The CIR is an independent, industry-funded expert panel that assesses the safety of ingredients used in cosmetics in the United States. Unlike the SCCS, CIR assessments are voluntary — FDA does not require them. However, CIR findings carry significant weight in the industry and are often used as part of safety substantiation under MoCRA.

CIR reviews over 2,000 ingredients and publishes their findings in the International Journal of Toxicology. Assessments are available at cir-safety.org.

FDA (US)

Under MoCRA, FDA has new authority to review cosmetic ingredient safety. However, unlike the EU's positive-list approach, the US primarily maintains a short list of prohibited or restricted substances (21 CFR Parts 700-740). The burden of safety substantiation falls on the manufacturer.

How Safety Decisions Are Made

Step 1: Data Collection

The evaluating body collects all available scientific literature on the ingredient, including:

Published peer-reviewed studies (searchable via PubMed)
Industry-submitted safety data
Exposure data from consumer use studies
QSAR (Quantitative Structure-Activity Relationship) modeling data
In vitro and in vivo test results

Step 2: Hazard Assessment

Scientists evaluate the intrinsic hazards of the ingredient — what harmful effects it could cause at any dose. This includes reviewing data on skin irritation, sensitization (allergic reactions), systemic toxicity, genotoxicity, and carcinogenicity.

Step 3: Exposure Assessment

Critically, hazard alone doesn't determine safety — exposure matters. A substance that's toxic at high doses may be perfectly safe at the concentrations used in cosmetics. Exposure assessment considers:

Concentration in the finished product
Product type (leave-on vs. rinse-off)
Application area and frequency
Dermal absorption rate
Aggregate exposure from multiple product types

Step 4: Risk Characterization

The final step combines hazard and exposure data to determine the Margin of Safety (MoS):

MoS = NOAEL / SED

Where NOAEL is the No Observed Adverse Effect Level and SED is the Systemic Exposure Dose. A MoS of 100 or greater is typically considered safe.

Why Different Markets Have Different Rules

The same ingredient can be allowed in one market and banned in another. This happens because:

Different risk tolerance: The EU applies the precautionary principle more strictly than the US
Different evaluation criteria: The EU evaluates ingredients for the entire population, while the US may allow higher levels with appropriate labeling
Different regulatory speed: The EU updates its annexes more frequently than the US updates its CFR
Different product classification: Some products classified as cosmetics in one market are classified as drugs/quasi-drugs in another (e.g., sunscreens are OTC drugs in the US, cosmetics in the EU)

This is exactly why multi-market compliance checking matters — an ingredient legal in the US might violate EU Annex III limits.

Staying Ahead of Regulatory Changes

Regulatory changes don't happen overnight. An ingredient typically goes through this timeline:

Scientific concern raised (academic study, consumer complaint, or authority initiative)
SCCS/CIR review initiated (6-18 months)
Opinion published (public comment period)
Regulation amended (6-24 months after opinion)
Transition period (typically 6-12 months for reformulation)

By monitoring SCCS opinions and CIR reviews, brands can anticipate restrictions years before they take effect. Cosmetica's regulatory feed tracks these publications and alerts you when changes affect your product formulations.

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