Moderate Active Ingredient NOAEL Data Dermal Penetration

Retinol

INCI: RETINOL

CAS Number
68-26-8
Function
retinoid / skin-renewing / active
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
EU Max Conc. 0.05% RE in body lotions; 0.3% RE in other leave-on and rinse-off products
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes No federal concentration limits for retinol in OTC cosmetics. FDA classifies retinol as a cosmetic ingredient (not drug) at typical cosmetic use levels. No mandatory pregnancy or age warnings required under US law, unlike EU Regulation 2024/996. Safety guidance relies on industry self-regulation (CIR); CIR has affirmed retinol safe as used. Aggregate exposure concern (diet + supplements + topical) applies equally but is not regulated at federal level.

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
low
Sensitization
none

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

10 study endpoints found for Retinol. NOAEL (No Observed Adverse Effect Level) values are used to calculate the Margin of Safety per SCCS methodology.

Endpoint Value Route Species Study Type Source
NOAEL 30 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 9 mg/kg bw/day oral rat Subchronic COSMOS_DB
NOAEL 137 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 51 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 39 mg/kg bw/day oral guinea pig Short Term Toxicity COSMOS_DB
NOAEL 0.48 mg/kg bw/day oral rat Subchronic COSMOS_DB
NOAEL 75 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 54 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 21 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB
NOAEL 300 mg/kg bw/day oral rat Short Term Toxicity COSMOS_DB

Dermal Penetration Profile

Skin absorption and penetration characteristics of Retinol, relevant to systemic exposure and MoS calculations.

Absorption %
8-12%
Penetration Level
dermis
Penetration Depth
epidermis/dermis
Molecular Weight
286.5 Da
Log P
5.68
Systemic Absorption
yes
Topical Bioavailability
2-5%
Safety Margin Factor
high
Vehicle Dependent
Yes โ€” absorption varies by formulation

Source: SCCS/1516/13, CIR

Expert Verdict

Retinol (CAS 68-26-8) is EU-restricted under Regulation 2024/996 with maximum concentrations of 0.05% RE in body lotions and 0.3% RE in other leave-on and rinse-off products. SCCS opinion SCCS/1639/21 found worst-case modeling reaches approximately 97% of the EFSA UL from cosmetics alone, creating meaningful concern for high consumers already at UL from diet or supplements. Products must carry mandatory label warnings for children under 12 years and pregnancy considerations.

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Concern Level: Moderate

Regulatory Flags

eu-restricted sccs-opinion pregnancy-warning age-restriction aggregate-exposure-concern fda_food_additive

Frequently Asked Questions

Is Retinol safe in cosmetics?

Retinol (CAS 68-26-8) is EU-restricted under Regulation 2024/996 with maximum concentrations of 0.05% RE in body lotions and 0.3% RE in other leave-on and rinse-off products. SCCS opinion SCCS/1639/21 found worst-case modeling reaches approximately 97% of the EFSA UL from cosmetics alone, creating meaningful concern for high consumers already at UL from diet or supplements. Products must carry mandatory label warnings for children under 12 years and pregnancy considerations. The EU classifies Retinol as "restricted". Safety rating: MODERATE. 10 toxicological study endpoint(s) are available in our database.

Is Retinol allowed in the EU?

Retinol EU regulatory status: restricted. Maximum allowed concentration: 0.05% RE in body lotions; 0.3% RE in other leave-on and rinse-off products. This is based on EU Regulation 1223/2009 and its amendments.

What does Retinol do in cosmetics?

Retinol functions as: retinoid / skin-renewing / active. It is classified as a Active Ingredient in our database. CAS number: 68-26-8.

What is the Margin of Safety for Retinol?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

What is the NOAEL for Retinol?

The NOAEL (No Observed Adverse Effect Level) for Retinol is 30 mg/kg bw/day based on a Short Term Toxicity study via oral route in rat. A total of 10 study endpoints are available. Source: COSMOS_DB.

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