OH DAISEY INGREDIENT LIBRARY
Methylisothiazolinone
A potent skin sensitizer associated with allergic contact dermatitis, even at very low concentrations.
OH DAISEY VERDICT
Avoid
Evidence level: Strong
Why Oh Daisey rates it this way
A potent skin sensitizer associated with allergic contact dermatitis, even at very low concentrations.
What it does
Prevents bacterial, yeast, and mold contamination.
How to read this rating
This rating reflects the Oh Daisey ingredient standard and the evidence currently available for cosmetic use. Product safety can also depend on concentration, exposure route, formulation, manufacturing quality, and individual sensitivity.