Methylisothiazolinone
Korean INCI: 메틸이소티아졸리논 · Also written as: MIT, 메칠이소치아졸리논, 메틸이소치아졸리논
Irritant / cautionMay irritate
What it is
MIT — allergenic preservative
How it affects the score
Flagged separately in results for potential irritation or allergy.
How to read it on the label
If you have a sensitive scalp, avoid products where this sits high on the list.
Ingredients are listed by descending concentration. Anything after the ~1% anchors (EDTA, hexanediol, preservatives) is effectively trace.
Check your own shampoo
Paste your full ingredient list to see this ingredient's position and the overall score.
Related ingredients
Gluconolactone · Base
Glyceryl Caprylate · Base
Dehydroacetic Acid · Base
Diazolidinyl Urea · Irritant / caution
DMDM Hydantoin · Irritant / caution
Levulinic Acid · Base
※ For reference only, based on public ingredient data — not medical advice.