Moderate Cosmetic Ingredient NOAEL Data

Benzimidazole

INCI: BENZIMIDAZOLE

CAS Number
51-17-2
Function
Skin conditioning agent
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status prohibited
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Permitted for cosmetic use under general safety provisions; not CIR-reviewed as standalone ingredient

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

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
moderate
Sensitization
low

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

5 study endpoints found for Benzimidazole. 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 250 mg/kg bw/day oral rat oral REACH
NOAEL 200 other oral rat oral REACH
NOAEL ca.176 mg/kg bw/day oral rat oral REACH
NOAEL ca.335 mg/kg bw/day oral rat oral REACH
NOAEL 250 mg/kg bw/day oral rat oral REACH

Expert Verdict

Parent heterocycle used mainly as a building block for derivatives such as UV filters like bisoctrizole; limited standalone cosmetic safety data; some in vitro mutagenicity flags for the base compound in non-cosmetic literature.

โš ๏ธ
Concern Level: Moderate

Frequently Asked Questions

Is Benzimidazole safe in cosmetics?

Parent heterocycle used mainly as a building block for derivatives such as UV filters like bisoctrizole; limited standalone cosmetic safety data; some in vitro mutagenicity flags for the base compound in non-cosmetic literature. The EU classifies Benzimidazole as "prohibited". Safety rating: MODERATE. 5 toxicological study endpoint(s) are available in our database.

Is Benzimidazole allowed in the EU?

Benzimidazole EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.

What does Benzimidazole do in cosmetics?

Benzimidazole functions as: Skin conditioning agent. It is classified as a cosmetic ingredient in our database. CAS number: 51-17-2.

What is the Margin of Safety for Benzimidazole?

not established 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 Benzimidazole?

The NOAEL (No Observed Adverse Effect Level) for Benzimidazole is 250 mg/kg bw/day based on a oral study via oral route in rat. A total of 5 study endpoints are available. Source: REACH.

๐Ÿ“ฑ

Is Benzimidazole in Your Products?

Scan any product label with Piro โ€” our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.

Try Piro Free โ†’

Analyze Your Full Ingredient List

Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Benzimidazole in your formulation.