Sodium Hydroxide
Approved
pH Adjuster; Neutralizing Agent
Also Known As
Caustic Soda; Lye
CAS Number
1310-73-2
What It Does
Raises pH and neutralizes acidic ingredients during formulation.
Why Oh Daisey Rates It This Way
Concentrated sodium hydroxide is corrosive and can cause severe skin burns and permanent eye damage. In finished cosmetics it is typically neutralized or highly diluted, leaving little free sodium hydroxide.
Evidence Level
Strong