Sodium Hydroxide
Korean INCI: 소듐하이드록사이드
Base
What it is
pH adjuster
How it affects the score
Formulation ingredient (cleansing, viscosity, preservation). Not scored.
How to read it on the label
Common to most shampoos — no need to judge a product by its presence.
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
Gluconic Acid · Base
Disodium Phosphate · Base
Lactic Acid · Base
Malic Acid · Base
Vinegar · Base
Sodium Bicarbonate · Base
※ For reference only, based on public ingredient data — not medical advice.