Sodium Laureth Sulfate

What it is

Primary cleanser; can irritate sensitive scalp

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.

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