Isothiazolinones are synthetic preservatives used in a range of products including cleaning, laundry and personal care. They are known as sensitizersiv, which have been linked to allergic contact dermatitisv. Because of these health concerns, the European Parliament and the Council on Cosmetic Products have proposed to restrict isothiazolinone use to rinse-off products onlyvi ( i.e. products such as body and hand washes, and not leave-on products such as moisturisers).
iv) Scientific Committee on Consumer Safety SCCS Opinion On Benzisothiazolinone
v) Factsheet on uses and hazards of chemical ingredients of sanitized
vi) Public consultation on Methylchloroisothiazolinone and methylisothiazolinone preparations
EWG score: The EWG score is a hazard score ranging from 1-2 (low hazard), 3-6 (moderate hazard) and 7-10 (high hazard) published by the Environmental Working Group. Their data is sourced from the Skin Deep® database and studies published in open scientific literature.
3 - 7 (depends on usage)