Octylisothiazolinone
Octylisothiazolinone is a preservative used in cosmetics and personal care products to prevent the growth of bacteria, yeasts, and molds. It helps to maintain product integrity and extend shelf life by protecting against microbial contamination. This ingredient is effective at very low concentrations.
NonePreservativeVeganEvidence: Medium
RiskHigh 2.5 / 4
Sensitization i2.5 / 4
Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.
Systemic exposure i1 / 4
Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.
Rated by SpottyLabs' ingredient methodology, independent of brands.
Things to watch
- May cause skin sensitization in some individuals
- Potential for allergic reactions
See how this matches your skin
Find out exactly what you put onto your skin. Scan any product before you buy. Free and independent — no brand is paying us. Available on both on Android and Apple
Frequently asked questions
- What is Octylisothiazolinone used for in cosmetics?
- Octylisothiazolinone is used as a preservative to prevent the growth of harmful microorganisms like bacteria, yeasts, and molds, ensuring the product remains safe and effective over time.
- Is Octylisothiazolinone safe for sensitive skin?
- Octylisothiazolinone has a known potential for skin sensitization and allergic reactions, especially in individuals with sensitive skin or pre-existing allergies. Patch testing is advisable.
Spotty Labs
