Sodium Hydroxide
氢氧化钠
Also known as: Lye, Caustic Soda
What it does
- pH adjuster (raises pH)
- Saponification agent in soap making
Evidence
Strong evidenceSafe at trace amounts used for pH adjustment. Not an irritant at final product levels.
Skin types
Well suited for: All
Sounds scary but at product concentrations is completely safe—just a pH adjuster.
Irritation potential
None
Comedogenic rating
0 / 5
Pregnancy
Generally considered safe during pregnancy
Safe at product concentrations.
Good to know
Don't be alarmed by this on an ingredient list. It reacts and is consumed during formulation—not present as lye in the final product.
Related ingredients
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Analyze a productEducational information only — not medical advice. Always patch test and consult a dermatologist for skin concerns.