Salicylic Acid

What it is

Evidence-backed for scalp exfoliation/sebum care (may irritate at high %)

How it affects the score

Backed by regulators or clinical evidence. Scores +12 when in the top/mid of the list, +7 near the tail.

How to read it on the label

Check whether it sits in the top third of the ingredient list — near the tail means low concentration and limited effect.

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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