Hydroxyisoleucine

CAS Number
55399-93-4 (racemic); L-4-Hydroxyisoleucine: 781658-23-9
Function
Humectant; Softener and conditioner
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Permitted โ€” no FDA restriction

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.

Expert Verdict

Neat compound carries GHS skin and eye irritant classifications; diluted cosmetic use likely safe but lacks published dermal toxicity and sensitization data at cosmetic concentrations. Primarily studied as a nutraceutical insulin sensitizer rather than topical ingredient.

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Concern Level: Moderate

Regulatory Flags

potential-allergen

Frequently Asked Questions

Is Hydroxyisoleucine safe in cosmetics?

Neat compound carries GHS skin and eye irritant classifications; diluted cosmetic use likely safe but lacks published dermal toxicity and sensitization data at cosmetic concentrations. Primarily studied as a nutraceutical insulin sensitizer rather than topical ingredient. The EU classifies Hydroxyisoleucine as "permitted". Safety rating: MODERATE.

Is Hydroxyisoleucine allowed in the EU?

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

What does Hydroxyisoleucine do in cosmetics?

Hydroxyisoleucine functions as: Humectant; Softener and conditioner. It is classified as a cosmetic ingredient in our database. CAS number: 55399-93-4 (racemic); L-4-Hydroxyisoleucine: 781658-23-9.

What is the Margin of Safety for Hydroxyisoleucine?

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.

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