Potassium Hydroxide
Explained
Potassium Hydroxide (also known as potash) is a strong alkaline ingredient that does one job: it nudges a product's pH up so the whole formula lands in a skin-friendly range.
It's also the base that turns oils into liquid soap during the soap making process.
An expert safety panel reviewed it and found it safe when formulations are made to be non-irritating.
As a pH adjuster, it's typically used well under 1% though regulatory caps go much higher: 5% in nail cuticle removers and 2-4.5% in hair straighteners.
Though there is some concern for irritation from raw or high pH material, a well-balanced formula will be a non-issue for the vast majority of people.
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