Science
Mechanism of Action
Operating as a broad-spectrum microbicide, Octylisothiazolinone disrupts microbial viability by irreversibly reacting with the crucial thiol groups within enzymes and proteins of microorganisms. This interaction compromises vital cellular functions, leading to definitive cell death and thus effectively preventing unwanted microbial proliferation.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
While an effective biocide, Octylisothiazolinone is identified as a relevant sensitizer. The European Union has not approved its use as an active substance in pesticides, and products containing 0.05% (500 ppm) or more require labeling due to its sensitization potential. Its presence in skincare is highly uncommon and generally discouraged due to these significant risks, making its inclusion in such products a potential 'dusting' concern if alternative, safer preservatives are available.
The Formula
Formulation
Stability
Octylisothiazolinone demonstrates robust stability across a wide range of temperatures and pH levels, specifically within a pH range of 4 to 10 in aqueous and industrial systems. Optimal performance is typically observed under acidic pH conditions. It is important to note that stability in highly concentrated formulations may vary, necessitating thorough pre-commercialization testing.
Conflicts
- Strong reducing agents (e.g., sulfides, mercaptans, bisulfites, metabisulfites)
- Strong oxidizing agents (e.g., hypochlorites)
- Amines (compatibility may vary by type, concentration, and pH)
Safety
Safety Profile
Octylisothiazolinone is identified as a relevant sensitizer with moderate potency, capable of inducing skin irritations and allergic contact dermatitis. There is no specific safety assessment by the Cosmetic Ingredient Review (CIR) for its use in cosmetics. The Scientific Committee on Consumer Safety (SCCS) has not explicitly reviewed it for cosmetic applications, and it is no longer approved for certain uses within the European Union, being listed as 'not approved' in the EU Pesticides Database. Products containing 0.05% (500 ppm) or more necessitate specific labeling due to potential sensitization. It is generally not found in skin care products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Due to its moderate sensitization potential, lack of cosmetic-specific safety review, and general absence from skincare formulations, Octylisothiazolinone is an ingredient best avoided in precision skincare.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources