CAS Number: 57-06-7

Description: Allyl Isothiocyanate, also known as mustard oil, is an organic compound that is sometimes used in cosmetics and personal care products. It is primarily known for its pungent odor and taste, which is characteristic of mustard and similar spices.

Other Names: Allyl Isothiocyanate is known by several other names or synonyms in the chemical and cosmetics industry, including:
Isothiocyanic acid, allyl ester

Uses in Cosmetics: Allyl Isothiocyanate is not commonly used as a direct ingredient in cosmetics due to its strong odor and potential irritant properties. However, it is sometimes found in very small quantities in products where its natural occurrence in certain botanical extracts or essential oils is utilized for fragrance purposes.

Skin Sensitivities and Allergies: Allyl Isothiocyanate is known to have a strong pungent odor and can cause skin and eye irritation in its concentrated form. While it's not a common allergen, individuals with very sensitive skin or fragrance allergies may experience skin reactions when exposed to products containing this ingredient.

Risks and Bans: Starting from January 1, 2027, Allyl Isothiocyanate is among the intentionally added ingredients that have been banned in cosmetic products in the state of California, according to Assembly Bill No. 496. This legislative action was taken to enhance cosmetic safety, especially for sensitive skin consumers, and to restrict the use of certain ingredients with potential risks. Therefore, cosmetic brands are required to remove products containing Allyl Isothiocyanate to comply with California's regulations, prioritizing consumer safety.

Please note that due to its potential irritant properties and strong odor, Allyl Isothiocyanate is generally not a preferred ingredient in cosmetics, particularly in products targeting sensitive skin. If you have sensitivity concerns or fragrance allergies, it's advisable to avoid products containing this ingredient.

How safe is it?

Hang tight. We're thinking.